Abstract: Embodiments of a method system and computer readable media are provided. In some embodiments, a system for analyzing application environments is provided. The system includes a difference module, residing in at least one computer. The difference module is operable to extract differences between a source environment for an application and a target environment for the application. The system includes a rule-based module, residing in the at least one computer. The rule based module is operable to cooperate with the difference module in applying a plurality of rules to the differences to produce a plurality of weighted differences, each rule of the plurality of rules operable to apply a weight to an environmental difference, the weight quantifying impact, risk, or relevance, of the environmental difference to operability or failure of the application.