Disadvantages of COCOMO estimating model - Project management (PMP)

Disadvantages of COCOMO estimating model.

Disadvantages:

a. COCOMO model ignores requirements and all documentation.
b. It ignores customer skills, cooperation, knowledge and other parameters.
c. It oversimplifies the impact of safety/security aspects.
d. It ignores hardware issues
e. It ignores personnel turnover levels
f. It is dependent on the amount of time spent in each phase.