But I haven't changed anything - the mystery of software developmen

I heard it the other day - the first time for a while "but I haven't changed anything".

It's a cry that most Software developers or software consultants will make from time to time - hopefully not too often. it's a bit like putting your glasses down and not being able to find them - someone has moved them. But of course then you remember where you left them - normally when you see them.

Software development can be a bit like that - so much to keep on top off as a project reaches conclusion - easy to forget that you had changed a routine to return a slightly different result.