
Studying Software Design Cognition ◾ 69
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ese three matrices characterize the transitions in each third of the session and are
used to measure dierences across the design session. If we examine the transition from
F to Be in these parts of the session, we can observe a rapid diminution of this activity: in
the rst third its probability is .67 and in the second and nal thirds it is .00. Similarly, we
can trace the behavior of other transitions from the beginning, through the middle, to the
end of the design session and use these results to build a quantitative model of designing
behavior.
If we assu ...