A number of system failures are occurring when corrections to previously detected errors are resubmitted for acceptance testing. This would indicate that the maintenance team is probably not performing adequately which of the following types of testing?

A.
Unit testing

B.
Integration testing

C.
Design walkthroughs

D.
Configuration management

Explanation:
A common system maintenance problem is that errors are often corrected quickly (especially when deadlines are tight). Units are tested by the programmer and then transferred to the acceptance test area; this often results in system problems that should have been detected during integration or system testing. Integration testing aims at ensuring that the major components of the system interface correctly.