With the emerging evaluation of information systems (IS)/information technology (IT) as strategic enablers, this paper critically reviews the literature relating to the strategic drivers of IS. Understanding the importance of IS drivers can be critical in designing IS strategy within an organisation, even though most organisations are diverse in their environments and, likewise, diverse regarding which drivers are significant for decision makers. Thus, taxonomies of IS’s strategic drivers will be produced from both the academic literature and published case studies. In this way, a classification of drivers as they relate to organisational strategic focus has been developed to help understand which drivers are needed for obtaining a specific focus. The result of this paper is taxonomy of strategic information systems planning (SISP) drivers regarding the strategic focus of IS, using X airlines as a case study. This categorisation can support the evaluation of SISP processes, which will, in turn, support decision makers throughout the planning process.