Historical perspective: Given an artefact with a design, one may consider
different versions of this artefact’s design over time.
In the case of a system, one may consider the current version, the version that
will be in existence after the development project has finished, and the (sketchy)
version of the ‘future’ system that serves as a navigational beacon in a sea of
possibilities to guide future development. In the case of a development process,
one may consider the execution plan/strategy that is being used at the moment,
or the plan/strategy that was used before.