Question Related to COCOMO model – 2

Question Mark

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.



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


Product 3: Organic Mode of Development

Effort = a (KLOC)b. person month

= 2.5 (75) 1.05 person month

= 232.67 person month

= 233 person month

Development Time = c (Effort) d Months

= 2.5 (233) 0.38 Months

= 19.8 Months

= 20 Months

Number of People = Effort / Development Time   persons

= 233 / 20 persons

= 11.65 persons

= 12 persons

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