Prioritizing Program Elements: A Pretesting Effort to Improve Software Quality

Table 3

Possible error conditions within a class/module.

Error condition	Examples
Error in computation
Wrong Algorithm	The module may carry out estimations wrongly due to faulty requirements or wrong coding of requirements
Calculation of underflow or overflow	The algorithm may produce in a divide by zero state
Error in data
Unacceptable data	The module may accept out of range or wrong input data, no data, wrong data type or size, or premature data; produce wrong or no output data; or both
Input data trapped at some value	A sensor may read zero, one, or some other value
Bulky data rates	The module may not be able to handle a vast amounts of data or many input requests simultaneously
Error in logic
Wrong or unpredicted commands	The module may receive improper data but continue to execute a process. It may be intended to do the proper thing under improper situation/state
Failed to issue a command	The module may not call a routine under certain circumstances