SIPs are used to incent sales professionals where total sales are not a precise measure of sales productivity. This is usually due to the complexity or length of the sales process or where a sale is completed not by an individual but by a team of people, each contributing unique skills to the sales process. SIPs are used to encourage and compensate each member of the sales team as they contribute to the team's ability to sell. It is not uncommon for the members of such teams to be located in different physical locations and for the product introduction to happen in one location and the purchase of such a product to occur in another location.