Executive Summary This report considers the four main sourcing approaches for procurement and supplier appraisal criteria. The example used in the research is the Abu Dhabi National Oil Company (ADNOC), and the analysis is performed using relevant literature and company data. Before choosing the type of sourcing for a particular product, the organization has to consider the state of the market for this good and determine its competitiveness, quality and cost margins, and significant players. Then, the appraisal of internal stakeholders has to be conducted to determine whose input into the discussion and implementation is the most valuable. The four methods of sourcing are single, sole, dual, and multiple, each having their own benefits and drawbacks. In this case, ADNOC uses multiple sourcing due to its growing demands and high risk of disruptions in production. To select suppliers, ADNOC has to retrieve such information as sellers’ certification, financial statements, environmental policy, experience, and workers’ capabilities. These questions are included in the company’s pre-qualification questionnaire. In post-award discussions, the focus has to be shifted towards deadlines, delivery milestones, and feedback channels. ADNOC should review its system to enhance suppliers’ data security. The main limitation of the project was the lack of available financial information about the company and suppliers. Introduction The company under analysis is the Abu Dhabi National Oil Company (ADNOC). According to the latest annual report, the total amount of direct costs in 2018 reached $4,9 billion (Abu Dhabi National Oil Company, 2019). Some typical categories include pipeline equipment and installation, furniture and fixtures, motor vehicles, plant machinery, research and technology, IT services, administrative services, and others, reaching the total number of ten or more. ADNOC works with both local and overseas suppliers, but the full list of suppliers and dollar spend is unavailable. For most needs, ADNOC employs the multiple supplier approach, working simultaneously with several vendors such as Vallourec, Tenaris, Sumitomo, Tianjin Pipe, Hengyang, TMK, JFE, and Voestalpine (McAuleu, 2016). Other methods are not as appropriate for the company’s size and needs. The oil company conducts the spend analysis using the 7-step strategic sourcing process (Supply Management, 2011). First, ADNOC profiles the category, for example, cleaning services which are employed to maintain the office buildings or development sites. To complete the investigation, the company has to understand the current state of the category’s contents owned by the firm as well as how and for how long the services can be used. Second, the market of potential suppliers is reviewed to locate local vendors that are suitable for the contract. Abu Dhabi and other cities where cleaning services may be needed have a broad selection of cleaning service companies. As a result, the company chooses a sourcing process, typically resorting to large tender projects. Suppliers that applied are appraised and selected according to their experience, quality, bid, and negotiation results. The chosen partners are contacted and implemented into the chain, and the company trac