200 Software teSting interview QueStionS
Step 6: Calculate total number of test points
Now that we have TPfs for all function factors, FPs and Qs (static test point
data), it’s time to calculate the Tp (Total number of test points). The formula
is as follows:
Tp
5 sum(TPf) 1 (FP*Qs/500)
For the accounting system total Tp
5 71.21 (use a calculator if needed).
The following figure shows how the total Tp is derived.
FIGURE 184 Qs calculation
FIGURE 185 Total number of test points
Step 7: Calculate Productivity/Skill factors
Productivity/skill factors show the number of test hours needed per test points.
It’s a measure of experience, knowledge, and expertise and a team’s ability to
perform. Productivity factors vary from project to project and also organization
to organization. For instance, if we have a project team with many seniors
then productivity increases. But if we have a new testing team productivity
decreases. The higher the productivity factor the higher the number of test
hours required.
teSting eStimation 201
For this project we have good resources with great ability. So we have
entered a value of 1.50 which means we have high productivity.
FIGURE 186 Productivity factor/Skill factor
Step 8: Calculate environmental Factor (E)
The number of test hours for each test point is influenced not only by skills
but also by the environment in which those resources work. The following
figure shows the different environmental factors. You can also see the table
ratings for each environmental factor.
FIGURE 187 Testware
FIGURE 188 Test tools
202 Software teSting interview QueStionS
FIGURE 189 Test environment
FIGURE 190 Test basis
FIGURE 191 Development testing
teSting eStimation 203
Step 9: Calculate primary test hours (PT)
Primary test hours are the product of test points, skill factors, and environmental
factors. The following formula shows the concept in more detail:
Primary test hours
5 TP * Skill factor * E
For the accounting application the total primary test hours is 101.73 as
shown in the figure.
FIGURE 192 Development environment
FIGURE 193 Primary test hours
Step 10: Calculate total hours
Every process involves planning and management activities. We also need to
take into account these activities. Planning and management is affected by two
important concepts. Team size and management tools. So below are the rating
sheet for team size and management tools. These values are summed and the
percentage of this value is then multiplied with the primary test hours.
204 Software teSting interview QueStionS
Finally, we distribute this number across the phases. So the total black
box testing estimate for this project in man hours is 101.73 man hours, a
13-man day approximately.
FIGURE 194 Number of test hours
FIGURE 195 Planning and control tools
FIGURE 196 Distribution over phases
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