14. The method of claim 13 wherein said backward analysis comprises the step of substituting a select IL statement with a skip statement when said select IL statement is an alternation statement and fails to assign a new value to a variable contained in an associated postcondition.
14. The method of claim 13 wherein said backward analysis comprises the step of substituting a select IL statement with a skip statement when said select IL statement is an alternation statement and fails to assign a new value to a variable contained in an associated postcondition. 15. The method of claim 14 wherein said backward analysis further comprises the steps of: supplying an invariance for evaluating an iterating select IL statement; simplifying a predicate generated from weakest precondition analysis, wherein said invariance functions as a postcondition for said analysis; and determining whether said invariance is true.