Which of the following can be defined as the process of rerunning a portion of the test scenario or test plan to
ensure that changes or corrections have not introduced new errors?

A.
Unit testing

B.
Pilot testing

C.
Regression testing

D.
Parallel testing

Explanation:
Regression testing means that after a change to a system takes place, you retest to ensure functionality,
performance, and protection.
Incorrect Answers:
A: With Unit testing, you test an individual component in a controlled environment where programmers validate
data structure, logic, and boundary conditions.
B: Pilot testing involves having a group of end users try the system prior to its full deployment in order to give
feedback on its performance.
D: Parallel Testing is performed when the organization is moving from one system to another. It is the process
of performing workflows in the legacy system and the new system to assure that the processes will lead to the
same result.

Conrad, Eric, Seth Misenar and Joshua Feldman, CISSP Study Guide, 2nd Edition, Syngress, Waltham, 2012,
p. 1105