Explanation:

Human resource (HR) demand forecasting is the process of estimating the future quantity and quality of people required. The basis of the forecast must be the annual budget and long-term corporate plan, translated into activity levels for each function and department. In a manufacturing company, the sales budget would be translated into a production plan giving the number and type of products to be produced in each period. From this information, the number of hours to be worked by each skilled category to make the quota for each period, would be computed. Once the hours are available, determining the quality and quantity of personnel will be the logical step.
HR Demand forecasting must consider several factors-both external as well as internal. Among the external factors are competition (foreign and domestic), economic climate, laws and regulatory bodies, changes in technology, and social factors. Internal factors include budget constraints, production levels, new products and services, organisational structure, and employee separations. Demand forecasting is common among organisations, though they may not do personnel-supply forecasting.