There is a bunch of techniques to do software estimation.
Now given a piece of software, is there some methods/techniques to evaluate the cost of change of an already implemented requirement ?

  • 3
    Expert estimation. You should ask your developers to make estimation. I think this is the only way to do it. – Sergey Kudryavtsev Jun 22 '15 at 9:36
  • Why would the estimating techniques be any different? – David Espina Jun 22 '15 at 11:24

There are several quasi-scientific methods- Look up COCOMO and Function Point Analysis - However there are massive overheads, financially, procedurally, intellectually and practically in deploying these (or presumably) any other method.

For all but the largest development projects it is likely that your best bet will be to work through the estimation process with the development team, as has been suggested in comments.

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