Q. Discuss some of the problems that are faced during maintenance of software?

- Habitually another person or group of persons working over the years in isolation from each other writes the program.

- Habitually the program is changed by person who did not understand it clearly resulting in a deterioration of the program's original organization.

- There is a high staff turnover in the information technology industry. Because of these people who aren't the original authors maintain many systems. These persons mayn't have adequate knowledge about the system.

- Some problems merely become clearer when a system is in use. Several users know what they want but lack the ability to express it in a form understandable to programmers. This is mainly because of information gap.