Sales and Strategy Forecast: If you have a target to achieve you can plan out your work according. It's just like keep the figures real and amenable. Unrealistic figures would not help you ever to get the target on time. Secondly with these forecast, you can compare your marketing strategies and come up with the best solutions for future activities.
Establishing strategies: several strategies are to be formulated, in order to cover the distance between what we want to achieve and what is possible to achieve, with the resources at our disposal. As we would usually have several options, we should analyze them and chose the one with more chances to achieve the marketing objectives.