definition a relationship between a constraint and an activity:
either input constraints must hold for the activity to take place, or
output constraints must hold immediately after the activity has taken
place
synonyms We would like to have an appropriate term here to
refer to items in the value-added chain, assuming that the activity
represents a process. Thus value-added input is
a possible term but we are not altogether happy with it.
variants --
examples the extraction of a tooth [activity] can take place
when the mouth is anaesthetised [input constraint]; assembly [activity]
can take place when the parts are in stock [input constraint]; the
customer has been served [output constraint] when the transaction
[activity] is complete
term in other fields precondition and postcondition in
planning