The forecasting approach that involves various procedures where salespeople provide forecasts for their assigned accounts is the

Salesforce composite method.

Explanation:

Salesforce composite method is a bottom up sales forcasting approach, wherein salesperson forcast their indivdual sales in the respective territories in a particular period of time. The company collect and consolidate the sales data from their salespeople of all the regions and states, therefore based on the data provided the company develop its sales target for a period of time. It is most accurate measure of forecasting sales for a company.