ing. This topic will be revisited in detail in Chapter 13.For further reading
on why individuals should keep track oftheir development time, see
Humphrey (1996).Accurate estimation is very hard to achieve.Dividing
tasks into smaller ones and keeping data about previous tasks and estimates
are usually a helpful beginning.
It is important that the estimation is done by the people who do the job,
which is often the programmer.The client also needs to check the estimates
for reasonableness.One big problem with estimating is that it is conceptu-
ally performed before the project is done,but in reality a lot ofinforma-
tion,
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