|Traditional planning procedures are linear: objectives are formulated, the present situation is assessed in relation to the objectives and a plan is designed that maps the future situation and includes measures necessary to achieve it. The scenario procedure is cyclical. The first cycle starts with an inventory and evaluation of the present situation. The next step is the design and evaluation of an extreme scenario to test the sensitivity of models. Several more realistic scenarios then display various options for the future land use and development. Each scenario is evaluated with respect to the economic significance and the significance for environmental protection. The conflicts resulting from these contrasting evaluations are presented to decision makers, e.g. the city council. If one scenario is accepted for more refinement, the next cycle starts. The conflicts present in this plan are objects of new scenarios, again offering different options. In an iterative optimisation process, they are again evaluated until an agreement is achieved.