1. A method to evaluate impact of a change in code of a depended upon component of a system stored in a non-transitory computer readable storage device upon a dependent component of the system, comprising: providing in a non-transitory computer readable storage device a first property evaluation summary structure that associates multiple respective property evaluations with a first version of a first component of the system; providing in a non-transitory computer readable storage device a second property evaluation summary structure that associates multiple respective property evaluations with a second version of the first component of the system; and comparing respective property evaluations within the first property summary evaluation structure with corresponding property evaluations within the second property summary structure.