The paper demonstrate the importance of the concepts of accounting information system to the organization by referring to the given case study on Adam & Co. In this paper, the evaluation of the expenditure cycle of the company has been done developing the system flowchart that assisted in getting an insight into the step by step of the processes. The description of each steps of the systems such as purchase, payroll and cash disbursement has been done by using flowchart. The later section of this paper outlines the weakness in the internal control process of the systems and the risks associated with such system.