Based on data obtained from a large scale survey of Australian companies, this paper examines the use of Strategic Information Systems Planning (SISP) approaches and methodologies. Generally, studies on SISP approaches are conceptual and they do not provide much for practitioners. In this study, analysis is done on the variable level which brings to the surface the normally hidden content of the relationships. New relationships between the SISP approaches, SISP success and several organisations’ attributes are discovered. It is found that ‘the borders and boundary lines’ which distinguish approaches have begun to blur and that the most popular SISP methodologies are not the most successful ones. SISP practitioners may benefit from knowing that emerging methodologies such as Fuzzy Cognitive Maps and Information Engineering can improve the success prospects of SISP. Many findings of significant importance to SISP practitioners, in the context of various industries, are presented.