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2008-04-16 19:13:25

What is ALM? Traceability

What is ALM?

If you are a software developer, there are a whole bunch of companies (including mine) who want to sell you stuff.

If you read any magazines, go to any conferences, or visit any websites, there is a good chance you've seen their (our) marketing efforts.

More and more often, the term you see in those marketing materials is "ALM".  Ever wondered what that term means?

It means "Application Lifecycle Management".

Don't you feel better now that I've cleared all that up?  :-)

Digression:  Dead-End Acronyms

So ALM is what I call a dead-end acronym.  Like all acronyms, nobody knows what it means until you see its expanded form.  But with dead-end acronyms, people can stare all they want at the expanded form and they still don't know what it means.  There's nowhere to go.  It's a dead-end.

We software developers have a tendency to create dead-end acronyms.  For example, SOA means "Service Oriented Architecture", but I still don't know what that means.

My personal theory is that dead-end acronyms get created when somebody forces the issue.  They create an acronym which didn't want to be created.  Indigo didn't really want to be WCF -- it just wanted to stay Indigo.

Dead-end acronyms.  Our special gift to the world.

No, really.  What is ALM?

Back to the point.  What is ALM?  Let's look a bit deeper.  The expanded form actually does hold a few clues:

So, we can translate "ALM" to "Managing The Whole Software Development Process".

I suppose it's obvious that "MTWSDP" doesn't exactly roll off the tongue like "ALM" does.

Worse, I'd have to say we still haven't made much progress here.  Isn't there some way out of this dead-end? 

What is ALM?

Two roads diverged in a wood, and I...

Starting from this point, attempts to define ALM usually go in one of two distinct directions.

  1. The Trees (focus on the details)
    1. List all of the activities in the whole software development process (idea, market research, requirements, design, architecture, implementation, testing, release, wild drunk release party, user support, postmortem, assignment of blame, sackings, regret over impulsive terminations, rehiring as contractors at twice the cost, lather, rinse, repeat).
    2. For each activity, list one or more tools that support that activity (requirements management, modeling, compilers, automated testing, issue tracking, project management, dart board, help desk, time tracking, etc).
  2. The Forest (look at the big-picture)
    1. Talk about the benefits that software managers can get from looking at the whole lifecycle.
    2. Talk about the integration between the various tools in the whole software development process.

I believe the essence of ALM lies in the big picture view, in the real benefits that software managers get from using a truly integrated suite of tools that give them the ability to deal with the whole software development lifecycle.  My definition of ALM proceeds from The Forest perspective, the big picture view.

Getting more specific

So far this piece is over 500 words long and it still doesn't say anything.  It's time to get a bit more specific.

Before I go any further, let me say that this particular article does not attempt to offer a complete definition of ALM.  For now I am going to focus on just one issue:  Traceability.

Let's look at an example.

The Mystery of the PersonCompanyAssoc Table, Part 1

Joe is a technical support representative for CrummySoft, an ISV that sells a CRM solution.  He is working with a customer who says they just upgraded from version 6.0 to 7.0 and suddenly everything became really slow.  In an effort to track down the problem, he goes to visit Sally, a program manager.

Joe:  One of my customers says version 7.0 is a lot slower than 6.0.

Sally:  How much is "a lot"?

Joe:  Loading their dashboard page went from 1 second to around 30 seconds.

Sally:  That's a lot.  How many other customers are complaining about this?

Joe:  I've heard of a few.  Maybe a dozen.  So far.

The detective work begins.  Sally opens her IDE and digs into the problem.  Looking into the DB schema, she sees something odd.

Sally:  Here's something odd.

Joe:  What?

Sally:  Somebody changed the SQL table schema during the 7.0 dev cycle.  In 6.0 and prior, each person could be associated with exactly one company.  In fact, the People table had a column which was a foreign key into the Companies table.  Sometime during 7.0, this changed.  Now we have a new table called PersonCompanyAssoc, which allows a Person to be connected with more than one company.

Joe:  OK.  So what's the problem?

Sally:  The problem is that there were lots of places in the code which assumed a Person would only be associated with one Company.  Somebody went through and tried to fix them all with a bunch of changes to indexes, triggers and constraints.  Not all of those fixes were done in a very scalable way.  Most customers will be unaffected, but I could imagine some situations where we end up with a major slowdown.

Joe:  What kinds of situations?

Sally:  Well, for example, I'm guessing things would get bad if the Locations table has lots of different entries for the same Company.

Joe:  Bingo.  My customer deals mostly with virtual companies.  Their database has one company which is scattered across thirty different states and five countries in Europe.

Sally:  That would do it.

Joe:  So doesn't this change seem kind of stupid anyway?  Why would somebody need the ability to associate one person with multiple organizations?

Sally:  I don't know, but there's probably a reason.  Let's look for more clues.

Sally brings up the version control history log to find out who made these code changes and why.

Sally:  Apparently the PersonCompanyAssoc table was added by a developer named Tony.  The checkin comment explains what he was doing, but there's no rationale for why and no mention of the spec for this feature.

Joe:  So hey, as long as we're here in the code, can you just put it back the way it was?  If this change doesn't make any sense and it's causing performance problems, why not just undo it?

Sally:  It would probably be better to understand the whole story before we just change it back.  Let's go find Tony and ask for more info.

Isn't version control enough?

Version control does give you some traceability, and that's a good thing.  But in many cases, it is not enough.

Version control will tell you about code changes.  It can answer questions like Who, What and When.  But the hardest question in traceability is Why, and version control often lacks enough information to give a good answer.  Even if the developer is supposed to give a checkin comment which explains why a change was made, the detective work tends to get stuck because the clues dry up.

Very few developers write checkin comments which are good enough to solve the really tough mysteries in software development, and they shouldn't have to.  We don't need better checkin comments.  We need all the artifacts from the whole software development process to be linked together.

The Mystery, Part 2

Sally and Joe walk across the CrummySoft campus to building 71 where they find themselves in a seemingly endless room filled with cubicles.  The manager sitting next to the entrance at a mahogany desk with a nameplate identifying him as Biff.

Biff:  Can I help you?

Sally:  We're looking for a developer named Tony.  Is he here?

Biff:  Why do you want to see him?

Sally:  He made a code change and we need to ask him for more information about it.

Biff:  OK, let's see.  Tony.  Ah yes, he's in cubicle 19-346-B.

Joe:  19-346-B.  Where's that?

Biff:  I gather that you've never been here before?  Very well.  Cubicle 19-346-B.  Go to aisle 19.  Walk down to the 346th cubicle.  Tony should be in the one on your left.

Joe and Sally eventually reach Tony's cubicle where they find him playing World of Warcraft.

Tony:  You need somethin'?

Joe:  Why did you add a PersonCompanyAssoc table during the 7.0 dev cycle?

Tony:  How should I know?  That was like nine months ago.  I've probably made at least two other code changes since then.  I can't be expected to remember details like that.

Sally:  Do you know anyone who might know?

Tony:  Ask Phil in QA.  Maybe there's some info in that bug tracking database I've seen him using.

Joe:  So where do we find Phil?

Tony:  Geez, have you guys never been here before or what?  Phil is in cubicle 61-842-A.  That means you go down to aisle 61, turn left, and walk down ---

Joe:  Yeah, yeah, we got it.  Thanks.

Sally and Joe meander their way across the cubicle field to find Phil.  Along the way, Joe pauses at the intersection of an aisle and a row.  The walls in all four directions are too far away to see.  Continuing on, they eventually reach their destination.

Sally:  Phil, any idea why Tony added a PersonCompanyAssoc table about six months ago?

Phil:  Yeah, I think we did that to fix a bug. 

Joe:  Which bug?

Phil:  How should I know?

Sally:  Well could you look it up?

Phil:  Fine, let's see.  Oh yeah, it's bug 8675309.

Sally:  Does that bug have any information about why the change was made?

Phil:  Not really, but there's a comment here by somebody on the sales team.  Did you talk to them yet?

Joe:  Aha!  Let's go ask the sales team!

Team Size

ALM tools are often associated with very large projects and enterprise development.  This is just intuitive.  The more people involved, the more complexity to be managed.

Imagine trying to solve a mystery and you get stuck.  You need more clues, so you start canvassing the neighborhood looking for people who might have seen something suspicious.  Now suppose that "the neighborhood" is a software development division with 5,000 people in it.  Those interviews are going to take a while.

But chaos usually takes over long before a team gets that large.  Traceability may not be as important for a team of 50 as it is for a team of 5,000, but it can still be pretty important.  People forget why things happen, and that forgetfulness is not a function of the size of the team they are on.

You may be thinking, "My team is small.  We shouldn't have these kinds of problems, but this mystery still sounds familiar.  Why does this kind of detective work happen when we've only got 10 people?"

Are you sure you are counting everyone?  :-)

How about your customers?  They are part of your story.  When a customer asks for something, very often it triggers a sequence of steps.  And somebody will probably want to trace that sequence back to that customer.

SourceGear is a pretty small company.  We've got less than 50 people on our staff.

But our flagship product, Vault, is used by about 50 thousand people.  Sometimes we have a mystery to solve.  And very often the detective work leads us to one of those customers.  Our customers add to the complexity of our software lifecycle, and increase our need for traceability.

The Mystery, Part 3

When the plane arrives in Grand Cayman, Sally and Joe are greeted by a dozen beautiful people with perfect tans who escort them to the main company sales office, where, as always, a party is in progress.

Joe:  Who should we talk to?

Sally:  Let's find Bill.  He came to the company headquarters once for a meeting.  I think he'll remember us.

Weaving through the crowd, they eventually find Bill, martini in one hand, cell phone in the other.

Bill:  Do I know you?  Oh, wait.  Don't you work at the HQ back in Minneapolis?  I think we met last summer when I came up for that golf outing, er, I mean, sales training.  So what brings you all the way here to visit the sales team?

Joe:  We're trying to solve a mystery.  Between 6.0 and 7.0, somebody changed the database schema to handle multiple company associations per person.  Any idea why?

Bill:  Can I offer you a martini?

Sally:  Seriously, Bill, this code change is causing a lot of problems.  We want to just rip it out, but we figure we should understand the background first.

Bill:  Yeah, yeah, whatever.  That wasn't my deal.  Ask Marty.

After a bit more searching and stopping briefly to slide under the limbo bar, Joe and Sally find Marty in the corner of the room speaking intensely into his cell phone.

Marty:  Don't worry, you can count on me this time!  I'll have the feature in version 8.0, I promise!

Sally:  Hey Marty.  We're trying to track down some information.  Somebody changed the DB schema during the 7.0 dev cycle to allow multiple companies to be associated with each person.  Were you the one who requested that feature?

Marty:  Yeah, that's me.  I needed that tweak to close a deal.  Is there a problem?

Joe:  Yes!  That was a lot more than a "tweak".  It may seem simple, but it involved hundreds of code changes, and all kinds of things got messed up!

Marty:  Can I offer you a martini?

Sally:  Seriously, can you tell us why this change was necessary?  Why would anybody need to keep track of multiple companies per individual?

Marty:  One of my accounts is using our CRM product in selling to a network of consultants.  Those consultants have loose company affiliations.  One day they might be representing company XYZ, and the next day they're working for company ABC.  The assumption of "one company per individual" just wasn't flexible enough.

Sally:  Was it a good deal?  I mean, was this worth the trouble?

Marty:  I think so.  The deal was quite lucrative, and it opened the door to half a dozen more like it, three of which I have already signed.  Look, I'm sorry somebody screwed up this code change, but the business case behind it was solid.

Sally:  Alright, fine.  Thanks for the info.

The Whole Team

The full story of every significant software development project includes many different people.  Most of them are not writing code.  Tracing an issue backward can mean more than finding the bug report that motivated a code change.  We may need to go back further, back to the spec.

We might need to go back even further, back to the market research or the sales engagement or the customer support ticket.

A truly comprehensive approach to traceability would archive, index and link everything:

The challenge of an ALM tool is to support traceability across all stages of the software lifecycle.

The Mystery, Part 4

Joe and Sally head back to the airport to catch a flight back to the Twin Cities.

Sally:  So I guess this code change needs to stay.  But now we've got another mystery.  This code change caused a bunch of problems.  Why weren't those problems found in testing?

Joe:  Let's go back to that QA guy and ask him.

Returning to the main company headquarters, they find their way back to cubicle 61-842-A.

Phil:  Whazzup?

Sally:  We talked to the sales team and got some rationale for that PersonCompanyAssoc table change.  Now we're trying to figure out why the resulting problems weren't found during testing.

Phil:  Hey, don't look at me.  I just do what I'm told.

Joe:  Whatever.  So the product supports multiple locations per company, right?

Phil:  Yeah, I guess so.

Joe:  Do you guys have any tests which verify behavior for that case?

Phil:  I don't know.

Sally:  You don't know?  Why not?

Phil:  I just don't.  The tests aren't really organized like that.

Joe:  Well how are they organized?

Phil:  By number.

Sally:  And what do the numbers mean?

Phil:  Well, nothing.

Sally:  So is there any way to find which tests are designed to verify which features?

Phil:  Uh, well, no.  You could always open an individual test and read it to find out what it does.

Sally:  Great.  So you've got a bunch of tests and no way of linking them to anything?

Phil:  Exactly!

Sally:  OK, I think we're done here.

Forward Traceability

Traceability can do more than just help you figure out forgotten details of the past.  Sometimes we want to trace something "forward" through the software lifecycle, to see where it goes.

In this case, what we want is the following artifacts to be linked together:

  1. Requirement:  The system must support multiple locations per company.
  2. Test (validity):  Verify that the system can support multiple locations per company.
  3. Test (performance):  Verify that in a situation with multiple locations per company, the dashboard load time remains approximately constant.

This kind of traceability is most helpful in finding things that are simply missing.  If the performance test above does not exist, our ALM tool should be able to help us notice that.  If a Requirement is dangling, with no links to anything, it was probably never implemented, and our ALM tool should be fussing about that.

Traceability:  Connecting Everything Together

The ability to connect everything together is called traceability.  It allows us to look at the entire software development process, even though it involves

In a good ALM system, every item is linked to all of the other items related to it.  Code changes are linked to bug reports.  Bug reports are linked to help desk items.  Tests are linked to requirements.  When it comes time to do detective work, just follow the links.

You can't get good traceability merely by having one tool for each lifecycle stage.  You can assemble all of your favorite tools, but if those tools don't support outstanding integration with each other, you won't have traceability, so the result will not be ALM.

So is that all there is to ALM?  Just traceability? 

No, ALM is more than that, but traceability is a critical ingredient.  To have ALM, you've gotta have traceability.

Why to use a good ALM system

If CrummySoft had deployed an efficient ALM system with complete information, Sally and Joe could have solved this mystery in minutes, without the need to run all over the company and ask people questions.

Why not to use a good ALM system

If CrummySoft had deployed an efficient ALM system with complete information, Sally and Joe would not have gotten a free trip to Grand Cayman.  :-)