Answer to Question 1
Maintainability is the ease with which software can be understood, corrected, adapted, and enhanced. The cost elements of maintenance include defects, customers, documentation, personnel, tools, and software structure. The defect element refers to the number of unknown defects in a system when it is installed. Typically, the more latent defects, the higher the maintenance costs. The customer element refers to the number of different customers that a maintenance group must support. Generally, the more customers, the greater the maintenance costs. The documentation element refers to the quality of technical system documentation including test cases. Without quality documentation, maintenance efforts increase exponentially. The personnel element refers to the number and quality of personnel dedicated to the support and maintenance of a system. Maintenance programmers should be able to understand and change the software that they did not originally create. The tool element refers to software development tools, debuggers, hardware, and other resources. Such tools help reduce maintenance costs. Software structure refers to the structure and maintainability of the software. If programs are well-structured, they are easier to understand, modify, and fix.
Answer to Question 2
TRUE
The Olfactory System
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