How do you approach this situation so that minimum error is likely and other system components are not affected adversely?

Contingent Decisions  (discussion board )

1) As a human factors professional, when designing systems or program parameters and decision trees, how do you approach this situation so that minimum error is likely and other system components are not affected adversely?

2)Among these effects is the concern for system boundaries where one decision influences other system functions. Likewise, an objective is to increase system reliability where possible.