Schlumberger (SLB) Duri is a multinational company engaged in the field of services to oil companies. SLB Duri provides services to oil companies using the technology and provides useful data to the client from research conducted in oil mining and drilling. SLB Duri has cementing department, where the department provides the service to close the annulus of the oil well with cement mixture. Cement is the main ingredient in this cementing process. At this time, SLB Duri face problems in the process of calculating the amount of cement used that will be inputted into the invoice that will be submitted to the client. This study aims to provide solutions to the root causes of the process of counting the amount of cement. The first step to find the root of the problem that occurred in SLB Duri begins by describing the business process. Business process used to describe any process that occurs in cementing department. With the explanation of the business process, the root cause can be found and analyzed. The root of the problem that occurred in SLB Duri is no better method of calculating cement to put into the invoice to the client. The solution can be given to solve the existing problem in the SLB Duri by looking at the root cause of the problem is to provide a better cement usage calculation method. The provided solution is a method of calculation based on the density of cement per second, which is recorded by the machine. In other words, the cement that is being pumped per second can be calculated (Real time calculation). This method will be compared with existing methods of calculating cement in SLB Duri today. Based on calculations performed using Analytical Hierarchy Process (AHP), the best solution for method of calculating cement is given, which is the real time calculation. Keywords-Material management, business process, root cause analysis, SLB Duri, Analytical hierarchy process, cement calculation.Category: Decision-making; Operations;---------------------------------DISCLAMER: This paper is created by undergraduate students of School of Business and Management ITB in partial fulfillment of the requirement of the degree Bachelor of Management. Journal of Business and Management is not responsible for the content, opinions, or any other materials expressed here.

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