Possible cross-site duplicate ? — John 17 secs ago

That's the thing. Questions at Stack Overflow are supposed to be technical, preferably very technical. You're disqualifying your own question now as on-topic (i.e. broad/opinion based). Focus on the only technical issue. Or try another platform, f.e. Software Engineering. — Gert Arnold 43 secs ago

SO really isn't the place for development lifecycle questions. Maybe try SoftwareEng.SE — Machavity 8 secs ago

That question might give you the answer, but I recommend trying on your own first. You should read this Open letter to students with homework problems — dquijada 23 secs ago

I'm voting to close this question as off-topic because this question belongs another site like SoftwareEngineering or Maths.SE — Matthieu Brucher 53 secs ago