Why Are Projects Always Behind Schedule?
There is actually a nugget of thought in the article beyond the explanations you always hear (and which make up all the comments in this thread as I'm writing this): Even if you base your project schedules on accurate estimates of the median time required for each step, you will still be behind schedule for most projects.The reason is actually quite simple: when things go well, they can only go so well, but when they go bad, they can go really bad.Or, in a more quantitative way: while each step of the project will be equally likely to take longer or shorter than median, the steps that take longer can take much longer, while the steps that go faster only have a limited potential for balancing out the delays.