The state of the art of business strategy design today uses well developed sets of rules. If business segments and competitors are known, then the interaction of the competing firms takes place on two different levels. In the market place one product outcompetes another within the same business segment. Within the different firms clearing of the business portfolio's takes place across the market. Based on extensive groundwork by A. Lyneis we prototyped a general strategy-verification model, which not only serves as a training for marketing managers as e.g. Markops but which allows to start the simulation adapted to the specific business context for which a proposed strategy has been formulated. Some cases will be used to illustrate the approach chosen.