In recent years there has been a dramatic change in business environment resulting in reengineering of key business activities and processes. Among others, the role of information system (IS) has significantly increased as organisations have employed information technology (IT) to improve the capture, processing and distribution of information. Information became an important asset to the company, which is carefully monitored, planned and upraised. The paper presents the results of a survey on the strategic IS planning practices of Slovene companies. It highlights the participation, critical success factors and main benefits of strategic IS planning. The results show that comparing to similar studies very low number (50%) of responding companies were performing strategic IS planning. It is also interesting that in Slovene companies the leading initiator is top management (36%) whereas the role of IS management is surprisingly modest (23%). Main benefits of strategic IS planning from the Slovene business perspective are improved internal co-ordination, efficient and effective management of IS resources and improved productivity.