Abstract
We present a process algebra with conditional expressions of which the
conditions concern the enabledness of actions in the context in which a
process is placed.
With those conditions, it becomes easy to model preferential choices.
A preferential choice of a process is a choice whereby certain
alternatives are excluded if at least one of the other alternatives is
permitted by the context in which the process is placed.
Preferential choices are usually modelled rather indirectly using a
priority mechanism.
Preprint available here.