
Designing Assumptions ◾ 257
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aer a short delay preguring the ensuing dispreferred response. Interestingly, the sugges-
tion in the question appears to be an attempt to simplify the model; the negative answer
is a recommendation to avoid having to consider the complication of lanes altogether. In
terms of the design task, assumptions are again employed here as a means of distinguish-
ing between world and system, and managing the complexity (or conserving the simplic-
ity) of the program being developed.
e use of “assumption” as border police of the world/system divide is also clear in the
following exa ...