[cm277]

Here goes nothing:

- Have the people that will run the work (tech lead, senior dev, whatever) break the work down in meaningful chunks/modules.

- The number of modules is important: it should be roughly equal to the man-months you're trying to budget for --just a rule of thumb. Basically, not two few and not too many.

- Have the same people give you two numbers for each chunk: the best case scenario based on what their gut tells them and the worst case scenario (where 'worst' here is a bit short of nuclear winter, but not optimistic).

- Your project will take the total of the averages of the min/max estimates.

You're welcome. Source: 20 years of delivering tech projects on time...