||The complexity of IT strategy preparation grows when the company has more than one business and more than one operational country. This situation is common among big construction companies. This paper divides the strategy process into three parts (the Trend Work, the IT Mapping and the Strategy Work) and the entity of IT strategies to four parts (IT Utilisation strategies, the Corporate IT Strategy, IT Service Strategies and IT Principles) to ease the preparation. The approach is based on the development of relationships between business and IT and it concludes other modern IT strategy preparation systems. This paper contains also experiences about preparation of IT strategies earned in YIT Corporation in 2001-2008. Keywords: IT Strategy, IT Utilisation Strategy, Business-IT Relationship, Business IT, IT Infrastructure, Trend Work.