Putting newbies on Reports. Beneficial/Harmful? [closed] - report

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Closed 11 years ago.
In my work experience, most fresh out of school programmers are set right to creating reports for 6-12 months or so. While I see the benefit of doing something non-crucial, it seems to really discourage them.
So my question is, should organizations allow newbies to work with someone experienced right off the bat, obviously doing non-critical phases of a project, do get a real feel for what their career choice has in stock, or throw them on reports out of the gate?

Ah, there really is nothing like exploiting interns for remedial jobs...
Seriously though, you get back what you put in. Forcing them to do a thoughtless, thankless job for a long period of time is a quick way to build up a useless team member.

Perhaps they should be looking for a job at different companies? Maybe they shouldn't settle?
I was once a fresh-grad, and I have never been asked to work on a report. I had a programming check-in within the first 5 days of my job.
Maybe I am confused about the question. We are talking about folks who apply for programming positions and are sent to doing "reports" related job?!

I didn't start in "reports". I started on a conversion -- just get stuff to run on the new platform. Relatively safe, minor programming changes.
Then I did some new development for a while.
Then another conversion.
Then -- 2 years into my career -- no longer a complete n00b -- I wound up in "Reports". They wanted something like a dozen dumb-as-dirt accounting reports. Each was a "pull from the general ledger", "do some quick math" and "write a columnar report". [It was 1980, that's how stuff was done.]
I couldn't stand to do copy-and-paste programming. So I wrote a thing that extracted from the ledger into an array of values. It used a flexible notation for doing calculations on values in that array, then it wrote out the results of the calculations.
It could add, subtract, multiply and divide. You could use multiple operations on a series of "cells" to compute wonderfully complex things. To a limit.
I had invented the spreadsheet, built as a COBOL batch program. Seriously. That's what putting someone on reports can lead to. A single program that produced the dozen dumb-as-dirt financial reports. And a large number of additional reports, too.
Bonus. It was built in an Agile, incremental fashion. The first version did a half-dozen of the really easy reports. The next one did two or three more.
I don't think "reports" is a bad gig. What's bad is forcing people to copy and paste yet another dumb-as-dirt report program from a cookie-cutter template.

I believe it to be beneficial. It's what happened to me long ago and it provided me an opportunity to learn the database schema, the domain, and how the data is being used.
But, if they were hired as a Software Engineer they shouldn't be a report writer indefinitely. Programmer/Analyst however...

It's beneficial to the company in the short run, because then you can get useful work out of new graduates. It's harmful to everyone in the long run, because creating reports isn't really that hard, so the newbies don't learn much from doing it.
That being said, 6-12 months is a really long time to stick anybody on doing reports (unless they enjoy it, which most people don't). Maybe a shorter time period would be better training for a new employee.

I've worked in shops that threw a lot at the new hires where the results were mixed and I've worked at shops where they did pointless monkey-business exercises such as writing reports that nobody would read, attending 'process' meetings and open-ended tasks like "read a book about C++" or "learn something about this technology or that one. Both of these approaches were a waste of effort and time.
At my shop, if you are the new guy you aren't going to get left to your own devices to figure out X or to create busy work for yourself. Typically, we'll run you through our products so you are familiar with them as a user, then we'll talk through whatever task it is we need you to do, do the "I'm right over here, tell me if you need assistance" thing and then check up on them during the morning "what are you working on?" meeting. The goal at my shop is to get a developer up to speed as quickly as possible without skipping over the important stuff.
I think the key to successfully developing the new employee, particularly one who may be right out of school is to challenge them, provide them with interesting tasking that will make them not dread coming to work. If you get them interested in the work, you get an employee who becomes valuable. There are some tasks that just aren't interesting, and we all do them at my place. For me, I dread getting anywhere near MS Word to write formal documentation, but that comes with the territory sometimes. The 'new guy' needs to realize it won't always be code slinging or new development. Sometimes it is maintenance coding - much of the time it is. Sometimes it is 'turn the crank' type work. Sometimes it is report writing.
A good manager or senior developer will mentor the new hire. If a shop doesn't do that, I'd probably not want to work there myself.

They should be pair programming (or spectator programming) with different people from their department for a few weeks. Then they get to know all the people, the structure, the code and useful tips.

Reports are a wonderful introduction.
They tend to have very specific specifications, unlike many other projects. They're a good "stand alone" task. They also give the developer a good introduction to the domain model, which they must use to actually get the data out for the report.
Finally, they're (typically) reasonably simple with some reporting framework doing most of the heavy lifting for them. So they need to focus on learning the tools of the trade, deployment, and the data model.
They're a nice gradual introduction to the larger domain and application.

I've never been put on a non-important job as a safety function. Even when I didn't know exactly what I was doing I got put on important projects people wanted yesterday, and then paired with someone who had specific development he/she wanted to offload onto the new-hire.
It works pretty well that way.

If you put a college grad on report-writing duty for a long time, he's going to bail on you. Bad management and a waste of money...

I have two contrasting experiences with Crystal Reports in two different companies:
With my first employer (fresh out of University), our Crystal Reports expert was leaving, so I was asked to take over the role. No actual training was provided, so I had to learn everything on-the-job, with no support from either the Vendor or the Employer. Although my position description was as an IT Developer, I eventually spent 100% of my time working on Crystal Reports. It was an unproductive experience for me, and a waste of manpower and resources.
My current employer asked me to assist another Developer in creating and maintaining their Crystal Reports setup. Because they provided adequate training, and I was mentored in the role, I gained knowledge on multiple systems and databases. I even a little experience at administrating and maintaining SQL Server. And I also got the chance to interact with many different clients in the company, as many different sections of the company needed these reports.
So my answer to the original question is that it really depends on the organization, rather than the central concept. If your employer is intending to use it as a way of familiarizing new employees with multiple systems, then I think it's a great idea. If it's just a short-term way of foisting a thankless (and rotten) job on a hapless new employee, then I think it's a waste of manpower and resources.

The good thing about reports is that they are not updating information so there's no chance that any data will be lost.

Depending on what the tools are for reporting too. When I did reporting, I learned tons about SQL, and stored procedures. Of course that is probably not the norm for reporting.

It depends on the report, and it depends on the job. Many reports are anything but trivial, and excellent SQL skills are needed to create a performant and properly maintainable back-end. If your newbies are good with SQL, let them cut their teeth on the queries. It will be a good way for them to learn the schema of your database.
However, if "putting them on reports" is just a euphamism for them trying in vain for hours without direction or inspiration to format a table in Crystal reports 25 (or whatever the current version is), well, I think you probably already know my answer to that question...

Related

How do you keep yourself updated with latest technology trends, considering that technology today is enhanced almost every day?

It's most asked question in IT job interview so I want to know what should the way that I explain the answer of this type of question asked to me.
"One machine can do the work of fifty ordinary men. But, No machine can do the work of one extraordinary man"
The simple meaning of new technology is to make work or effort simpler or make it easy.
Not just technology but everything that may changes you update yourself with it.
To keep updated with technology you need to use technology, specially latest enhanced technology.
The concept is: by doing so (using technology) it will become obligatory for you to keep track of any new or emerging technologies through reading, searching etc.
I am not claiming that this is something you should do. Its one of the way what you try to do to make yourself updated to some extend with the pace of technology change.
you should go and subscribe yourself to various RSS feeds, go frequently to some great sites (dzone, javalobby etc.) and look for blogs/articles which deserves a read.
Things which you don’t know in this case deserves more read and i start googling stuff to get more details.
see, technology products will not succeed if they are developed for their own sake, nor simply to help users complete a specific task. Technology products succeed when they are incorporated by users into their daily lives in ways that serve their fundamental needs as people - fundamental needs such as relating to others and keeping in touch, even when they are miles apart.
The truth is nobody fully understands knows how today’s technology might be used tomorrow. If the recent past is anything to go by it’s likely that people will certainly find innovative and as yet unthought-of ways to communicate and keep in touch.
Thanks,...!!!

kanban scrumish tool(s) to get started [closed]

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Closed 10 years ago.
After investigating a little bit scrum and kanban, I finally read this answer and decided to start using kanban, picking something from scrum (note that I'm working mostly by myself, and I do have read this question and its answers).
Now, my question is: which tool would be best to get started?
whiteboard and postit
agilezen.com
JIRA with greenhopper
a spreadsheet (possibly on Google Docs)
brightgreenprojects.com
Agilo
Target Process
something else (please specify)
Notes about each:
I would lean towards the whiteboard, but there are several drawbacks (e.g. cannot make automatic charts, time measurements, metrics, and sometimes I work from home - where I need it most - and it's not convenient to carry :-)
I don't want to remember another username/password (I promised to myself to signup only to OpenID-enabled services)
My employer has JIRA but my group doesn't use it - I might ask for an account (it shouldn't require another password) and maybe later involve the rest of the group. But I don't know if they are using greenhopper and if it's a big deal installing it.
I generally hate spreadsheets
maybe overkill?
I'd be happy to have a localhost instance, but it could be problematic to give access to the whole group (per network/firewalls) - not a deal-breaker but surely a concern
What I'd like to get from this?
being more productive
tracking how much time I spend in any given task, possibly discussing the issue with my supervisor
tracking what "blocks" me most often
immediately see where I am compared to my schedule
manage in a better way my long todo list (e.g. answering faster to the "what I should do next?" question)
Do you have any suggestion?
Note on the scrumish tag: read the Henrik Kniberg's PDF. He first introduced the definition of scrumish on page 9.
If I may, I think that you are on the wrong path. Anything else than 1. or 4. is overkill and pretty much useless for a non distributed team. So for a team of one person...
Seriously, if you can avoid using a web based application, just do it. First, unless you are already mastering Scrum/Kaban, you need to learn the process, not a tool. Don't let a tool dictate the process. Then most web based tools are just too much click intensive, less easy and fast to update, less transparent/visible than a spreadsheet and a physical board. They are really 2nd category options.
So, I'd go for a spreadsheet and a physical board combo. If you need some charts (I'm still wondering what kind of chart/metrics you want to generate and what value they provide), a spreadsheet is the ideal tool (but honestly, you don't need any tool to draw a burndown). If you need to work from home, take the spreadsheet (or use google docs) and post its with you. Let's be objective, the impediments you mentioned are actually not real.
Last thing, if you had chosen the simplest thing that can possibly work, you would already be doing Scrum, Scrumban or whatever. So, instead of looking for a tool, my advice would be to just start doing it.
agilezen.com seems like the ideal solution for you. I have used it in the past solo for myself and it is convenient. I would not let a prejudice against non-OpenID sites get in the way of making a good choice.
pick the tool you already have, and start using it; don't let the absence of the "perfect tool" become an excuse not to start
EDIT: pick the simplest thing that can possibly work. In your case that would be whiteboard and postit notes. These have almost no setup overhead and will provide a constant visual reminder of what you're supposed to be doing.
And I suggest that you get used to making decisions on your own, as you're going to have to be your own Scrum Master ;-)
In the interests of diversity ;-) www.kanbantool.com has just launched too. It's open beta and seems at first glance even more "lightweight" than agilezen.
Target process is good too
We've been using JIRA with Greenhopper for a few months, in an effort to go agile. I use it for both Scrum for development, as well as for my personal kanban. The software is pretty flexible, and I'm going to keep with it. The story/subtask management is really handy, and it's fairly easy to use. One thing I like is that you can add stories/cards quickly, and can customize the data. This allowed me to add definition of done fields, work order numbers, etc.
In short, we're happy with it.
Bright Green have just launched a free version of their tool. It looks good .. the free version is fully functional too: https://signup.brightgreenprojects.com/plan/Free
I've tried out another kanban product for personal use and am absolutely loving this one. Feels lightweight and simple but actually packs in a fair amount of functionality at the same time.
www.kanbanery.com (free for personal use)
A novel tool not mentioned before is getsmartQ (out of beta since Dec 2010)
Key characteristics: very intuitive, supports LWP, customizable forms, and task discussions
Pros
configurable workflow, mark overdue stories, mail notifications (e.g., for upcoming story deadlines), multiple story owners
Stories form completely customizable, per project workflow and story forms, different roles (people only creating stories)
very responsive GUI with partial updates
Apparently good support: I've asked a question and got a good answer within a few hours
Cons
no easy way to declare something as blocked or to distinguish type (feature/bug/..)
no API
no subtasks or story dependencies
In comparison to Agilezen it has a more sophisticated notification system, but apart from that still lacks important features (see cons above).
Note, getsmartQ is under active development and hence missing features mentioned above may have been implemented in the meantime.

Does the Scrum process ultimately divest team members from their respective skills? [closed]

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My organization has been experimenting with the introduction of more "Agile" methods. We've been trying the Scrum approach for a short while, and most of the team has, more or less, adapted to it. I like it as a whole, but I'm concerned about one potentially severe impact of the methodology: as teams are consistently focused on features and backlog items, and testers are more integrated with the overall development process, it seems like skill sets are becoming blurred, and people are sensing less respect for their individual abilities.
Some of our developers are excellent at server-side technologies and optimization of heavy-weight data provisioning. Others have invested a large amount of their careers learning GUI technologies and have developed a fundamental understanding of users and usability in an application. Neither skill set is better than the other, but they are certainly different.
Is this an inevitable result of the Scrum process? Since everyone on the team (as I understand it) contributes to satisfying the next feature/requirement, backlog item, or testing goal at hand, the underlying philosophy seems to be "anyone can do it." This is, in my experience, simply not true. Most engineers (developers, testers, etc.) have a particular skill set they have honed over the years, and the Scrum methodology, in my mind, tends to devalue those very abilities they were previously respected for.
Here's an example for clarification:
If a sudden change of technology occurs on the server-side data provisioning, and every item on the to-do list for the sprint is based on this new change, the GUI developers (who likely haven't had time to become acclimated with the new technology) might not be able to contribute to the sprint. At the very least, they will need to invest time to get ramped up, and then their code will be suspect because of their lack of experience.
I understand the need for rapid development to discourage "role silos" but doesn't this discount one fundamental reality: people develop skills in accordance to necessity, their interests, or their experiences. People seem to be less motivated when they perceive their position is one of "plug-ability" (e.g. we can "plug" anyone in to do this particular task). How does Scrum address this? If it doesn't, has anyone addressed this when adopting the Scrum methodology?
The short answer is an emphatic NO! Scrum does not blur or depreciate the skills required for specialization. Scrum does not promote generalization.
The long answer is that in Scrum, the most important thing is to get the work "Done". The team, as a team (as opposed to a collection of individual "stars") collaborate, as needed, in order to get the job done. Whatever it takes - however they want (Scrum is about self managing, self motivating teams, right?).
What this means is that a scrum team may be composed of several specialists, who primarily do what they specialized in (DBA, Graphic Design, even technical writers). The team, as a whole, should have all of the skills required to fulfill the requirements. This is not the same as saying that each team member has to have all of the skills aforementioned.
That being said, it is often desired - often by the members themselves - that members other than the specialists be at least adequate in skills different from their specialty. Another poster already mentioned Scott Ambler's "General Specialist". This helps the team when there's too much work of one kind, when the specialist is absent, and it helps the member when he really would like to gain experience outside his specialty.
Given that the team is self organizing, if for some reason a specialist finds himself in the middle of the sprint, without any work to do in his specialty, the best way to deal with it, is to simply ask the specialist what he wants to do. Let the team decide. The specialist can decide to help in his other areas of adequacy, do a POC for the next sprint, "shore-up" the defenses by fixing some long forgotten technical debt, or shine the shoes of the members who are working.
Yup. I don't know if this is the long answer. But it definitely was a long answer.
:-)
The point of Scrum is for the developers to self-organize. We use scrum where I am, and jobs get passively sorted by a person's focus. We don't do it on purpose with a chart and list, it just happens. We all know who's best at what, or what their main/secondary focuses are. If the 'main' person needs help, they get the person/people with a secondary focus in it to help. We do get plenty of tasks not necessarily in line with whatever our particular focus is, but you always know who to ask for help then.
For your example - I don't know that if you say had 3 server guys and 5 gui guys, that you'd expect to get all the work done in that sprint (if the server guys + some help from the others wasn't enough). The way the sprint is supposed to work is that from a prioritized list, the developers pick what they think they can get done in that 30-day timeframe. If that meant the GUI guys needed 2 days of server-side training in order to help, that's what it'd mean. Unless there were concurrent things also high up the list that they could do instead. The sprint tasks are not supposed to be dictated by management as a psuedo-deadline.
If you have a Safari account, there's an interesting mostly case-study book by one of the guy/s who invented scrum.
I've been working as a ScrumMaster for about 18 months and have worked with two different teams. I initially expected to experience the potential issues you raise but this has not been the case. What I generally observe is that the team evolves into a mixture of specialists and generalists as people find the appropriate role for themselves - one that they can enjoy and be successful at. This is self-organisation at work. I have never had a case where our specialists were sitting idle.
If this did occur, I would expect it to be raised as an issue in Sprint Retrospective and the team would discuss how to improve the situation. The most obvious (and brutal) conclusion would be to change the team composition.
I am not sure why skill set will get blurred. There is a fair amount of confusion in the agile world. Scrum is a project management process and not a software development process and should not be seen as one. The engineers have to follow their own methodologies like TDD or extreme programming to add their own part to being agile.
Nothing goes away in scrum.
PM's still document as they go
Architects still architect their components. The only thing is they just delay some major decisions to more responsible point in time.
Developers should still follow best practices such as SOLID principles to enable for refactoring in a consistent manner as features change.
I think Scott Ambler addresses this issue very thoroughly in http://www.agilemodeling.com/essays/generalizingSpecialists.htm...
His concept of a Generalizing Specialist is exactly the thing Collective Ownership / Scrum Team calls for, and makes total sense to me.
Its hard to achieve in real life though ;-)
If you find for any reason ('sudden change of technology' or not) that the amount of work required for a system over a sprint is greater than the amount available then there's a problem with your scheduling.
One fix is that, as you suggest, you take programmers from other areas and throw them onto the mix. How well this works depends on the skills of that person and how different the problem domain is, but treating programmers as generic units that can be farmed out as needed is generally not a successful strategy for developing software.
This is still a scheduling problem though.
The best thing about Scrum is exactly the fact that skills do get a bit blurred! The point is to avoid silos at all costs by spreading specialist knowledge across the team and letting people work a bit outside their comfort zone.
Obviously this is not for everybody. Some developers are happy in their own narrow specialist field and such people are more of a hindrance in a Scrum process than an asset, whereas well-rounded and multi-talented people who are determined to get the job done, usually adapt very very well to it and are far more productive.
One of the key benefits of Scrum is to get the whole team actually involved and invested into the project instead of tackling their own special tasks and then riding off to the horizon. I'd claim that for most people, this is a far more rewarding way of working than the conveyor belt -approach of waterfall processes.
So I'd advise to boldly embrace the mixing of skills and having people come together to take down nasty problems instead of relying on specialist silos. The result of teams consisting of motivated people can be surprising.
Sounds like this would lead to more well-rounded developers, and also allow those who are experts in certain areas to continue to contribute their expertise.
I haven't used Scrum much myself (yet), but from your description, these types of teams would lead to a team/organization that is also more well-rounded as a whole - and shouldn't that be the goal of any team?
Handling sudden changes is part of Agile and this may mean that some people have to go off and learn new skills. Course this is more within the general Agile philosophy than anything Scrum-specific. There may be some extreme cases where the customer or business decides to change the world by bringing in something new and thus has to handle the subsequent pain of those people ramping up but if this is what they want and the developers are overruled, then there are only a couple of choices: (Take your lumps and try to handle the major changes) or (quit and get out of there).
While there can be some cases where someone that has specialized in something may be able to do things faster, this doesn't necessarily mean much if that is just one person on the team that is an expert and there is enough work in that area for 10 people for the whole sprint. Should those not an expert simply not do that work and let that one person attempt to get through as much as he or she can? I don't think so but there should be something to be said for those that aren't the best at something still trying to get done what they can get done.

Type of Team Lead: More Programmer || More !Programmer [closed]

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Yesterday I had a team leader of another team say that they took a while to figure out something I wrote on a wiki page because I referred to obtaining code from source control as "checking out" which apparently confused them. They said that they were use to Clear Case and had only heard of the term "joining a project" and said that they haven't really programmed much for a long time.
While this is fine, what it then made me think of is the different types of team leaders I've had over the years. I've had some that have been almost purely managerial and I've had those that are programmers that do managerial things at the same time.
Do people have a preference as to what kind of team leader they have? How do you care if your team lead is active in the development of your product? I find team leaders who actually sit and code like the rest of the team more likely to understand things like (from my experience):
things aren't always as simple as they sound. Team leaders I've had who don't code or rarely code at all believe everything is a piece of cake and shouldn't take much time at all (which perhaps might be the case if you want to hack it together)
they are more understanding that developers don't always like sitting in long meetings and do their best to avoid getting their team into as many pointless meetings as possible
they understand what you say from a technical point of view. Those that might not have coded for a while might not be up to speed with a lot of the new technologies, techniques or lingo
I find it much more satisfying to have a team leader who has the mind of a developer and likes to get their hands dirty in the code as well. Perhaps there are some people out there that like team leads who distance themselves from the actual coding side of things and simply doles out the work, or perhaps another type of team leader that I haven't mentioned?
A team leader has to be a coder -- they can't lead the team unless the team respects them and where they're taking everyone.
A team manager, on the other hand, can either be a coder or someone who is just well organised and knows when to ask questions and interface to other management.
It is possible to find both a manager and a leader in the same person, but more often the roles (should be) separate and distinct.
You should read the book Managing Humans. I am of the opinion managers should keep their hands out of the code. They have more important responsibilities like keeping people away from developers, so they can do their job. Having them jump into development creates confusion as they aren't in it enough to know what's going on and have their time divided between that and other things, so it is difficult to count on them for major pieces of functionality. Plus, it really sucks when you have to tell your manager that something they just wrote needs to be changed, and you have to go back and redo it. Managers are really their to jump on the grenades for the rest of the team, so they can focus on accomplishing the task at hand.
That being said, should manager's know about software engineering? Yes of course they should, that's the field they are in. Should be know how to code in the latest and greatest whiz bang technology? That shouldn't really matter as long as they get how software development works.
I have no preference, I can't, I have to work with all of them, even though too many cooks spoil the broth. On a multi-developer typical project I have a technical lead, project manager and a non-technical customer. Of course, divisional and programme management will each stick their head in.
There are a number of types of leader, each have their own traits:
Non-technical customer: "The customer is always right." Often wants a moon-on-a-stick. Will call both the management and the technical bods and take the best answer as gospel.
Team manager/line manager: Somewhat pastoral role. Not particularly interested in the project I'm working on right now. Steps in when there is a decision to be made between project priorities. Probably really wants to be a coder, and delegates all the rest of his work that he can to his subordinates.
Project manager: Varying degrees of technical know-how. Is concerned only with timescales and costs. Does not understand, "I don't know how long its going to take, I need to play with it for a couple of days first to get a feel."
Team leader/technical lead: Just another developer, but with more experience. Responsible for technical decision making that will affect the whole project. Often fighting with the project manager to carry out good engineering practice, even though it will take longer in the short term.
Team leader/glorified secretary: Someone who is supposed to lead the team, but acts as more of a secretary. (Usually a grade above the team). Answers the phones, insulates customers from the technical bods. This works fine until they ask a technical question, where the glorified secretary tries to blag his/her way out of it, and eventually they work around the secretary and talk direct to the team.
We typically have a PM (non technical) who manages the project from an admin. viewpoint and a Tech Lead who manages the technical aspects and provides technical leadership to the team.
The Tech Lead will code parts of the project and will probably be the main (only) developer for the "Proof of Concept" stage.
On some smaller projects, they are the same person but it's a rare combination.
The absolute worst Software Leads/Chief Software Engineers that I've worked with were the ones that wanted to be intimately involved in the technical details. Too many important tasks were either missed or just not done. Managing a team is a full-time job. If the lead wants to get involved in the technical aspects it will certainly come at the expense of the managerial aspects.
I’ve only had 2 Software Leads/Chief Software Engineers out of dozens that I thought were worthwhile. While both were previously software engineers, those days were long gone for both of them. They knew it. They didn’t even try to pretend. Their job was now to manage. Their job was to make sure the developers had every chance to succeed. They did their best to remove all obstacles and make sure everyone was making progress.
I have a theory, but have never seen it in action, that the best software lead would be someone who is not, nor ever has been a software developer. They specialize in the true spirit of management, specifically that of being a facilitator. Unfortunately, most managers are more politically motivated or are just in the job because they've reached their pinnacle technically.

Are there specific "technical debts" that are not worth incurring? [closed]

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Closed 10 years ago.
There are (at least) two ways that technical debts make their way into projects. The first is by conscious decision. Some problems just are not worth tackling up front, so they are consciously allowed to accumulate as technical debt. The second is by ignorance. The people working on the project don't know or don't realize that they are incurring a technical debt. This question deals with the second. Are there technical debts that you let into your project that would have been trivial to keep out ("If I had only known...") but once they were embedded in the project, they became dramatically more costly?
Ignoring security problems entirely.
Cross-site scripting is one such example. It's considered harmless until you get alert('hello there!') popping up in the admin interface (if you're lucky - script may as well silently copy all data admins have access to, or serve malware to your customers).
And then you need 500 templates fixed yesterday. Hasty fixing will cause data to be double-escaped, and won't plug all vulnerabilities.
Storing dates in a database in local timezone. At some point, your application will be migrated to another timezone and you'll be in trouble. If you ever end up with mixed dates, you'll never be able to untangle them. Just store them in UTC.
One example of this is running a database in a mode that does not support Unicode. It works right up until the time that you are forced to support Unicode strings in your database. The migration path is non-trivial, depending on your database.
For example, SQL Server has a fixed maximum row length in bytes, so when you convert your columns to Unicode strings (NCHAR, NVARCHAR, etc.) there may not be enough room in the table to hold the data that you already have. Now, your migration code must make a decision about truncation or you must change your table layout entirely. Either way, it's much more work than just starting with all Unicode strings.
Unit Testing -- I think that failing to write tests as you go incurs a HUGE debt that is hard to make up. Although I am a fan of TDD, I don't really care if you write your tests before or after you implement the code... just as long as you keep your tests synced with your code.
Not starting a web project off using a javascript framework and hand implementing stuff that was already available. Maintaining the hand written javascript became enough of a pain that I ended up ripping it all out and redoing it with with the framework.
I really struggle with this one, trying to balance YAGNI versus "I've been burned on this once too often"
My list of things I review on every application:
Localization:
Is Time Zone ever going to be important? If yes, persist date/times in UTC.
Are messages/text going to be localized? If yes, externalize messages.
Platform Independence? Pick an easily ported implementation.
Other areas where technical debt can be incurred include:
Black-Hole Data collection: Everything goes in, nothing ever goes out. (No long-term plan for archiving/deleting old data)
Failure to keep MVC or tiers cleanly separated over the application lifetime - for example, allowing too much logic to creep into the View, making adding an interface for mobile devices or web services much more costly.
I'm sure there will be others...
Scalability - in particular data-driven business applications. I've seen more than once where all seems to run fine, but when the UAT environment finally gets stood up with database table sizes that approach productions, then things start falling down right and left. It's easy for an online screen or batch program to run when the db is basically holding all rows in memory.
At a previous company they used and forced COM for stuff it wasn't needed for.
Another company with a C++ codebase didn't allow STL. (WTF?!)
Another project I was on made use of MFC just for the collections - No UI was involved. That was bad.
The ramifications of course for those decisions were not great. In two cases we had dependencies on pitiful MS technologies for no reason and the other forced people to use worse implementations of generics and collections.
I classify these as "debt" since we had to make decisions and trade-offs later on in the projects due to the idiotic decisions up front. Most of the time we had to work around the shortcomings.
While not everyone may agree, I think that the largest contributor to technical debt is starting from the interface of any type of application and working down in the stack. I have come to learn that there is less chance of deviation from project goals by implementing a combination of TDD and DDD, because you can still develop and test core functionality with the interface becoming the icing.
Granted, it isn't a technical debt in itself, but I have found that top-down development is more of an open doorway that is inviting to decisions that are not well thought out - all for the sake of doing something the "looks cool". Also, I understand that not everyone will agree or feel the same way about it, so your mileage might vary on this one. Team dynamics and skills are a part of this equation, as well.
The cliche is that premature optimization is the root of all evil, and this certainly is true for micro-optimization. However, completely ignoring performance at a design level in an area where it clearly will matter can be a bad idea.
Not having a cohesive design up front tends to lead to it. You can overcome it to a degree if you take the time to refactor frequently, but most people keep bashing away at an overall design that does not match their changing requirements. This may be a more general answer that what your looking for, but does tend to be one of the more popular causes of technical debt.

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