Hi Luis:

do you think it is useful to present personalities in
pattern form? Was suggested by a reviewer. 

Here is a start. Should we put the full pattern on the web?

-- Karl
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Personality Pattern

Intent

Intent describe popular behavior independent of class structure.
Define the skeleton of an algorithm or a role deferring some steps
to abstract methods.
Turn roles on and off dynamically.


Motivation

Have an encapsulated unit for behavioral abstraction.
Distinguish between "IS-A" and "PLAYS-THE-ROLE-OF" relationships.


Applicability

Use to implement popular behaviors.


Structure

A personality  has local data and functions and 
a constructor and an upstream and downstream interface. 
A personality provides an implementation for a set of 
functions (the upstream interface) that modify classes 
that implement the downstream interface of the personality.

...

Implementation

Use interfaces and egos