Below is a link to a great post that is dead on. I used to think about the fact that software engineering doesn’t follow the same work pattern as engineering physical things when I worked in industry. People get the idea that you can schedule software projects when it is more like forecasting. I liken it to the tides versus the weather, you can schedule plans around the tides, years in advance, as there are actual schedules of the tides, a.k.a. Tide Tables,  not so with regard to the weather.
You don’t always know where things will be at a certain point in the future. Predicting things a few days out OK, trying to plan a software project grandiose style 6 months ahead and know where it is going to land, is like trying to make plans around a sunny and 72 degree July 4h BBQ, but trying to figure out that probability in January!

Chris Aitchison, says what I was thinking for years, but much better than I could have put it….

www.chrisaitchison.com/2011/05/03/you-are-not-a-software-engineer/
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