[Dan_]

Basically you need a great variety of housemates to provide lots of laughs but also meaningful arguments.Interesting tasks with the variation consisting of physical,intelligence,comedy and team work.It would be great to have an element of unpredictability in terms of twists and the evictions.Far too many evictions have been forgone conclusions and twists already known beforehand.

A set theme that will carry on right through the series is also key.I think evil bb works best, you cannot just let the housemates ease their way through the series without being seriously tested.The competitive edge also needs to be there between housemates.