...What exactly is 'didactic software'? 'Didactic' means a thing is intended to instruct, often in the moral sense and often excessively. Given the general tone of their initial description I suspect they actually meant 'autodidactic' which would imply that Hexagon is particularly easy to learn without outside instruction- ideal for the 'autodidact' or self-learner. But autodidactic would actually describe the learner rather than the software. In the ens both are obtuse terms that tend to confuse rather than instruct. Ironic, no? - Jack