This paper draws on the need to understand how mobile technology is implemented and used at the organisational level. IT is a general-purpose technology and therefore its use involves a high degree of uncertainty and ambiguity. Moreover, IT vendors and system developers tend to be very unambiguous in their rhetoric about mobile technology opportunities. Therefore, managers have trouble to identify the real scope, the functionality and the impact of new mobile applications. However, these three types of uncertainties need to be handled in change management projects where new information technology is involved. Gradual uncertainty reduction at these three different levels, i.e. what technology can do; will technology work; and will users adopt it, is studied in this paper. This is achieved through an analysis of the implementation process of an information system where mobile terminals are used to give service technicians access to the ERP system at BT Europe, a leading supplier of forklift trucks. The analysis shows how the three levels of uncertainty interact, and how the computerised parts of the information system are complemented by mindful intertwining with the non-computerised communication and manual data processing, in order for the information system to work.

This thesis is composed of an article series on ERP (Enterprise Resource Planning) system in different situations with a diffusion of innovations adoption perspective. The purpose is to describe the ERP phenomena as it was 1994 and as it is 2005 and develop a holistic view framework on the ERP in its environment. The basis of innovation theory focuses on time and reveals a general maturing process in ERP use. The market forces the ERP artefact, its customers ’ use and the service providers forward. The four studies included describe the ERP life cycle, the elements of ERP, and customers ’ use, and a framework of a helpful ERP structure is created. The first article is on ERP migration strategy with the purpose of simplifying large corporations ’ portfolio of different ERPs. Configuration of a few consolidated ERP sites, with more users in each site, offers both great risks and great opportunities. The diffusion process of a consolidated ERP structure is discussed. The second paper investigates intra integration within the use of ERP systems. ERP implementation does not automatic realize high level of functional integration although the