| CPM stands for critical path method | PERT stands for program evaluation and review technique |
| It is activity based method | It is event based method |
| It is used in repetitive works like construction | It is used in non-repetitive works like research |
| It is deterministic method with single time estimate | It is probabilistic method with three time estimate namely optimistic, most probable and pessimistic |
| It is concerned with control of cost and time | It is only concerned with control of time |
| Crashing of activities is possible | Crashing of activities is not possible |
| Resources like manpower , materials , etc. are unlimited | Resources are limited |
| It has reasonable time estimate for the project | It has high precision time estimate |