Critical Path Method or CPM: Developed in the 1950s, this methodology states that some tasks cannot be done unless other studies are done. Stringing these mutually dependent tasks together, the project manager can prioritize tasks and prepare a course of action. It helps in the proper allocation of resources. Critical Chain Project Management or CCPM: Takes the critical path method further by adding resource availability to the essential tasks. It creates time between studies to ensure the timely delivery of the project. Waterfall Project Management: Tasks are planned in sequence, one after the other, building up to the finished project.