For each sales engineers, project progress and what time the customer orders by the sales engineer can determine the subjective desire, even fixed OEM customers, there are uncertainties in the company's products have been identified using the RA, it includes many uncontrollable specific questions: What time can be such as project approval, project finance operations, changes in market demand is, therefore, found that the project engineer for each sales opportunity to receive the order this time interval could not help entirely personal decision, but all sales engineers through statistical time interval for each client activity approach to the analysis, we find the general rule.