  Model checking real-time systems is complex, and requires a careful trade-off
between including enough detail to be useful and not too much detail to avoid
state explosion. This work exploits variability of the formal model being
analysed and the requirements being checked, to facilitate the model-checking
of variations of real-time specifications. This work results from the
collaboration between academics and Alstom, a railway company with a concrete
use-case, in the context of the VALU3S European project. The configuration of
the variability of the formal specifications is described in MS Excel
spreadsheets with a particular structure, making it easy to use also by
developers. These spreadsheets are processed automatically by our prototype
tool that generates instances and runs the model checker. We propose the
extension of our previous work by exploiting analysis over valid combination of
features, while preserving the simplicity of a spreadsheet-based interface with
the model checker.
