Inevitably, the size of a research model increases with time. However, economy of code is always desirable. Voluminous coding to support issues which are not central to science accumulates and, if not restrained, starts to account for the bulk of model code. This practice is to be discouraged, although there is fine line to be drawn and the answers are not always unambiguous. When adding a new feature, the question to be asked is: How much code is this idea worth and can it be justified with respect to the prevailing level of scientific approximations being made? Some areas within MOM have become overly large and complex but with questionable10.4 gain. As time permits, ``dead wood'' will be eliminated and simplifications will follow.