This coordinates the efforts of all the parties involved to achieve the objectives. This division of the project into simple tasks is the basis for defining responsibilities, constraints, and preliminary budgets and scheduling. Then, budgeting gives a cost estimation of the project. This step is necessary to get the resources. Different factors influence budgeting, such as inflation, waste and spoilage, personnel replacement, learning curve, and contingencies for unexpected problems.
Scheduling is difficult too, because it takes into account the interdependencies of subprojects.
Critical tasks, that is to say, tasks which cannot be delayed without changing global objectives, are defined. And a level of priority is attributed to each task. Resource allocation consists of finding the best ways to fit together cost and time requirements, in establishing priority rules for resource allocation. Some methods such as Mathematical Programming, and Heuristic Techniques, ease the process of resource allocation. The issue of resource allocation takes more importance when different projects are run at the same time.