.: The upward or downward movements of a market, during a period of time. The market size is more difficult to estimate if you are starting with something completely new. In this case, you will have to derive the figures from the number of potential customers or customer segments. But besides information about the target market, you also need information about your competitor, your customers, products etc. Lastly, you need to measure marketing effectiveness. A few techniques are: Customer analysis,Choice Modelling, Competitor analysis,Risk analysis,Product research,Advertising the research,Marketing mix modeling.