A complete software package always includes documentation. Although its importance is often overlooked, documentation may be the only source of program design information. Major tasks in the software life cycle, such as design, coding, testing and maintenance, are often performed by different individuals. Lientz and Swanson (1979) found that, typically, only about half of a software system's maintenance personnel had been involved in its development. Poor documentation techniques can, therefore, dramatically increase labor costs throughout the labor intensive software life cycle by making both development and maintenance tasks more difficult.