IMPORTANT, MUST BE READ... : Top Five Embedded Software Management Misconceptions
Title : Top Five Embedded Software Management Misconceptions
Top Five Embedded Software Management Misconceptions
IMPORTANT, MUST BE READ... Here are 5 mutual management-level misconceptions I come across when I practice blueprint reviews of embedded systems. How many of these conduct keep y'all seen recently?(1) Getting to compiled code speedily indicates progress. (FALSE!)
Many projects are judged yesteryear "coding completed" to dot progress. Once the code has been written, compiles, too sort of runs for a few minutes without crashing, administration figures that they are 90% there. In reality, a variant of the 90/90 dominion holds: the offset 90% of the projection is inwards coding, too the 2nd 90% is inwards debugging.
Measuring teams on code completion pressures them to skip blueprint too peer reviews, ending upwardly amongst buggy code. Take the fourth dimension to practice it right upwardly front, too you'll to a greater extent than than brand upwardly for those "delays" amongst fewer problems after inwards the evolution cycle. Rather than mensurate "code completed" practice something to a greater extent than useful, similar mensurate the fraction of modules amongst "peer review completed" (and defects constitute inwards peer review corrected). There are many reasonable ways to manage, but waterfall-ish projects that care for "code completed" equally the most critical milestone is non ane of them.
(2) Smart developers tin forcefulness out write production-quality code on a long weekend (FALSE!)
Alternate form: marketing sets both requirements too destination appointment without applied scientific discipline getting a run a peril to pass plenty fourth dimension on a preliminary blueprint to figure out if it tin forcefulness out truly travel done.
The truthful flake is anyone tin forcefulness out slap together to a greater extent than or less code that doesn't work. Some folks tin forcefulness out slap together code inwards a long weekend that almost works. But fifty-fifty the best of us tin forcefulness out alone force thus many lines of code inwards a curt amount of fourth dimension without making mistakes, much less producing something anyone else tin forcefulness out understand. Many of us recollect putting together hundreds or thousands of lines on an all-nighter when nosotros were students. That should non travel false for writing production embedded code.
Good embedded code tends to cost most an sixty minutes for every 1 or two lines of non-comment code all-in, including testing (on a truly expert solar daytime three lines/hr). Some teams come upwardly from the Lake Wobegone school, where all the programmers are higher upwardly average. (Is that truly truthful for your team? Really? Good for you! But y'all even thus conduct keep to pay attending to the other 4 items on this list.) And sure, y'all tin forcefulness out game this metric if y'all try. Nonetheless, it is remarkable how oftentimes I consider a give away good higher upwardly most two SLOC/hour of deeply embedded code corresponding to a projection that is inwards trouble.
Regardless of the precise productivity number, if y'all desire your organisation to truly work, y'all postulate to care for software evolution equally a marrow competency. You postulate an appropriately methodical too rigorous applied scientific discipline process. Slapping together code speedily gives the illusion of progress, but it doesn't create reliable products for full-scale production.
(3) H5N1 “mostly working,” undisciplined paradigm tin forcefulness out travel deployed. (FALSE!)
Quick too dingy prototypes render value yesteryear giving stakeholders an thought of what to hold off too allowing iterations to converge on the right product. They are invaluable for solidifying nebulous requirements. However, such a paradigm should non travel false for an actual product! If you've hacked together a prototype, inwards my experience it's ever to a greater extent than expensive to build clean upwardly the mess than it is to accept a pace dorsum too start a projection from scratch or a stable production code base.
What the paradigm gives y'all is a company feel of requirements too to a greater extent than or less insight into pitfalls inwards design.
H5N1 good executed incremental deployment strategy tin forcefulness out travel a compromise to iteratively add together functionality if y'all don't know all your requirements upwardly front. But an well-run Agile projection is non what I'm talking most when I state "undisciplined prototype." H5N1 cool proof of concept tin forcefulness out travel real valuable. It should non travel false for production code.
(4) Testing improves software character (FALSE!)
If at that topographic point are code character problems (possibly caused yesteryear trying to convey an undisciplined paradigm to market), the green hammer that is brought to behaviour is to a greater extent than testing. Nobody ever solved code character problems yesteryear testing. All that testing does is brand buggy code a niggling less buggy. If you've got spaghetti code that is total of bugs, testing can't mayhap cook that. And testing volition to a greater extent than oftentimes than non immature lady most subtle timing bugs too non-obvious border cases.
If you're seeing lots of bugs inwards organisation test, your best bet is to exercise testing to uncovering põrnikas farms. The 90/10 dominion applies: many times 90% of the bugs are inwards põrnikas farms -- the worst 10% of the modules. That's alone an guess ratio, but regardless of the exact number, if you're seeing a lot of organisation exam failures too thus at that topographic point is a expert run a peril to a greater extent than or less modules are specially bug-prone. Generally the work is non merely programming errors, but rather miserable blueprint of these bug-prone modules that makes bugs inevitable. When y'all position a põrnikas farm, throw the offending module away, redesign it clean, too write the code from scratch. It's tempting to intend that each põrnikas is the concluding one, but after you've constitute to a greater extent than than a handful of bugs inwards a module, who are y'all kidding? Especially if it's spaghetti code, põrnikas farms volition ever travel ane põrnikas away from existence done, too you'll never travel out of organisation exam cleanly.
(5) Peer review is likewise expensive (FALSE!)
Many, many projects skip peer review to instruct to completed code (see detail #1 above). They experience that they exactly don't conduct keep fourth dimension to practice peer reviews. However, expert peer reviews are going to uncovering 50-75% of your bugs earlier y'all ever instruct to testing, too practice thus for most 10% of your evolution budget. How tin forcefulness out y'all non afford peer reviews? (Answer: y'all don't conduct keep fourth dimension to practice peer reviews because you're likewise busy writing bugs!)
Have y'all come across to a greater extent than or less other administration misconception on a par amongst these? Let me know what y'all think!
IMPORTANT, MUST BE READ...
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