Non-traditional has to be understood in a very broad sense.
Some examples can serve to make the idea more clear.
Instead of using a linear string for a GA some solutions or better expressed in a 2-dimensional form or in a tree structure. A coding traditionally represents a solution within a neighbourhood, but it could as well be a data structure which due to some transformation leads to a solution. Or it could as well be that the coding exists of some control parameters for a heuristic procedure which exists for the given optimization problem. Authors interested in presenting a paper in this area are requested to send a title to the session chairman by the end of June 1998. Abstracts of 50 words or less are requested by July 15.