Software Project Management

Good Books : The Mythical Man-Month

Estimation is critical to project planning.

Wikipedia : http://en.wikipedia.org/wiki/Estimation_%28project_management%29

Many methods are used to do estimation. To see a detailed description see The Mythical Man-Month Book.

l/3 : Planning
l/6 : Coding
l/4 : Component Test and early system test
l/4 : System Test, all components in hand.

Brook's law: "adding manpower to a late software project makes it later".
See http://en.wikipedia.org/wiki/Brooks%27s_law
The number of months of a project depends upon its sequential constraints.
The maximum number of men depends upon the number of independent subtasks.