<P> Simulation and modelling are computer - based tools developed to represent reality . They are widely used to analyse behaviours and to understand processes . Models allow demonstration of past changes as well as the examination of various transformations and their impact on each other and other considered factors . </P> <P> They can help to understand the connections between factors and events and to examine their dynamics . Simulation is a process that represents a structure and change of a system . In simulation some aspects of reality are duplicated or reproduced, usually within the model . The main purpose of simulation is to discern what would really happen in the real world if certain conditions, imitated by the model, developed . </P> <P> Although modelling and simulation became even more popular with the development of computing technology, application of these techniques have certain limits . Models represent a simplification of a system that is being examined; therefore the results need to be carefully considered . </P> <P> As the complexity of real systems increases models need to be more and more complex to represent the reality most accurately . In result, they may become increasingly difficult to understand and to be operated . Their complex nature can cause problems with using and managing results . </P>

Which of the following techniques of futures research builds upon environmental scanning