Question

1. A requirements model is reviewed to uncover errors, inconsistencies, and omissions. It took 4 hours to review the work product prior to actual review by 4 resources, 2 hours for actual review with 6 people, 10 hours estimated to correct errors with 3 resources. The requirements model contains 18 UML diagrams as part of 36 overall pages of descriptive materials. The review uncovers 12 minor errors and 6 major errors. Calculate the following:
   1. Error total
   2. Error density per UML diagram
   3. Error total per requirements model page
   4. Error total If there are 5000 lines of code
   5. Total review effort in person hours.

Answer 1

It is given to us that:

1. It took 4 hours to review the work by 4 resources.
2. Then it took 2 hours to review the work by 6 people.
3. 10 hours is estimated to correct the error with 3 resources.
4. The model contains 18 UML diagram.
5. The UML diagram is of 36 pages.
6. The review uncovers 12 minor and 6 major errors.

Now,

a. Error Total

error total = minor error + major error

error total = 12 + 6  

error total = 18.

Ans = 18 errors

b. Error density per UML diagram

error density = total error / total number of UML diagram

error density = 18 / 18.

error density = 1.

Ans = 1 error per total number of UML diagram

c. Error total per requirements model page

Total per requirements model page = total error / total number of model pages

Total per requirements model page = 18 / 36.

Total per requirements model page = 1 / 2.

Total per requirements model page = 0.5.

Ans = 0.5 error per requirement model page.

d. Error total If there are 5000 lines of code

Here Total line of codes is given 5000 as per question.

We know that the total number of error = 18.

Well in the question there is no mention of the ratio of the number of lines of code over the error nor the total lines of codes evaluated is given. Hence total error will be 18 only. But yes if you are taling about error density then we can calculate it as :

Defect density = total error / Total lines of code

Defect density = 18 / 5000

Defect density = 0.0036 defects per LOC

e. Total review effort in person hours.

Its given it took 4 hours for 4 people to review prior to actual review and it took 2 hours for 6 people to actually review it.

Hence

Total review effort in person hours = (4 / 4) + (2 / 6)

Total review effort in person hours = 1 + (1 / 3)

Total review effort in person hours = 1 + 0.33

Total review effort in person hours = 1.33

Ans = 1.33 person hours