Factors which need to be consdired when forecasting demand are;

$>$ Seasonality: Demand is high in few months and less in few months. One should have an idea of how the demand varies over the year

$>$ Competition: No$.$of competitors operating and their products launched have to be considered.

$>$ Historic data: It gives an idea of how the industry sales and sales of the company are moving

$>$ Legal and government regulations: One should keep an eye on rules of government and how they affect the demand