There has been research on the areas of on-line and mobile service domains both in the business research discipline and the technology discipline. Some of the research has concentrated on analysing the impact and usefulness of aligning the business planning and information system architecture planning. There has been less research on how to interconnect results of these research areas, although in the current world the area of on-line services is experiencing rapid changes, and adapting the information technology to these changes is important aspect of running on-line services business successfully. This paper presents an overview on the ongoing changes in the business domain, and presents a simple model for aligning business environment requirements to the architectural design and the implementation of the on-line service platform. KEYWORDS Business Environment, On-Line Service, Platform Architecture, Service Modelling, Modelling Change