The basic COCOMO model uses an equation for estimating the number of person-months needed for each of these project types.

A person-month can be thought of as a one-month effort by one person. In COCOMO, a person-month is defined as 152 hours.

Once the project type is defined, the level of effort, in terms of person-months, can be determined using the appropriate equation:

* Organic: Person-Months = 2.4 × KDSI1.05
* Semi-Detached: Person-Months = 3.0 × KDSI1.12
* Embedded: Person-Months = 3.6 × KDSI1.20

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