Estimation by approach. Always usefull

Sometimes the project manager people think the agile methods cant be used in the projects developed by a traditional approach. The things are not always black or white, we can use agile methods for all kind of projects. For example, the estimation by approach, we can use it for estimating task in projects with a traditional way of work.

In addition, the estimation by approach is always the best way for estimating task if you want a real estimation. The one way for a real estimation is to know the time a developer have spent in some task. This is the great true and, in conclusion, the bes† way to estimate a task is to use the known duration of some task and use this duration for estimating other task.

The estimation by approach is very simple, if we know that a developer spend 3 days for completing a login screen and we suppose the list of costumer screen has four times the login screen size then a good estimation for a list of costumer screen is 12 days.

How you can see, we are using a estimation by approach without change the way of work.