Computer system model generation with tracking of actual computer system configuration

A system comprising

• a configuration tracker for detecting configurations of a computer system, said configurations including an original configuration and a subsequent revised configuration;
• an interface permitting a user to apply an original series of changes to an original model to yield an intermediate model that corresponds to a potential configuration of said computer system but does not correspond to a past or current actual configuration of said computer system;
• recorder means for recording said original series of changes;
• and
• a model generator for generating said original model and a resultant model of said computer system, said original model corresponding to said original configuration, said resultant model corresponding to a resultant configuration that would result from a series of reconfigurations corresponding to said original series of changes or a revision thereof being applied to said computer system starting from said revised system configuration.