No one seems to have yet mentioned the work on quantifying software 
complexity such as the McCabe and
Halstead metrics.  There is evidence that these measures have behavioral 
correlates - e.g., modules with
higher cyclomatic complexity tend to have larger numbers of defects - so 
there is clearly a cognitive
aspect to software complexity.  However, I can't find any work which 
provides an explicity psychological model for
software complexity which could be used to relate it to more general ideas 
of cognitive complexity.

Ruven Brooks

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