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Question Related to COCOMO model - 2

Using the Basic COCOMO 81 model (see the tables and formulae below), calculate the effort required (in person-months), the overall development time, and the number of personnel required for each product described below.

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BASIC MODEL EQUATIONS

1. Effort = a (KLOC)^b. person month
2. Development Time = c (Effort)^d months
3. Number of People = Effort / Development Time   persons

Software Product Type	a	b	c	d
Organic	2.4	1.05	2.5	0.38
Semi-detached	3.0	1.12	2.5	0.35
Embedded	3.6	1.20	2.5	0.32

Product 1: A semi-detached mode product delivering 75,000 lines of code.
Product 2: An embedded mode product delivering 75,000 lines of code.
Product 3: An organic mode product delivering 75,000 lines of code.

Briefly comment on your estimations for the above products.

Solution:

We know that

Effort = a (KLOC)^b. person month

Development Time = c (Effort)^d months

Number of People = Effort / Development Time   persons

Given that, estimated Lines of Code = 75,000 = 75 KLOC

Product 1: Semi-detached Mode of Development

Effort = a (KLOC)^b. person month

= 3 (75) ^1.12 person month

= 377.73 person month

= 378 person month

Development Time = c (Effort) ^d Months

= 2.5 (378) ^0.35 Months

= 19.9 Months

= 20 Months

Number of People = Effort / Development Time   persons

= 378 / 20 persons

= 18.9 persons

= 19 persons

Product 2: Embedded Mode of Development

Effort = a (KLOC)^b person month

= 3.6 (75) ^1.2 person month

= 640.288 person month

= 640 person month

Development Time = c (Effort) ^d Months

= 2.5 (640) ^0.32 Months

= 19.7 Months

= 20 Months

Number of People = Effort / Development Time   persons

= 640 / 20 persons

= 32 persons