Business strategy is the most important for an IS auditor to review when determining whether IT investments are providing value to the business, because:
Business strategy is a plan or vision that defines the goals, objectives, and direction of the business, and how it intends to achieve them1234.
Business strategy is the basis for aligning and prioritizing IT investments with the business needs, expectations, and outcomes123 [4].
Business strategy is the source for identifying and measuring the benefits and value that IT investments deliver to the business, such as increased revenue, faster access to information, better customer service, or improved efficiency[1] 2^ 3^ 4.
Business strategy is the criterion for evaluating and communicating the performance and impact of IT investments on the business success[1] 2^ 3^.