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Enterprise Modelling (EM) tools are an important part of every EM application project. Continuous evolution of modelling methods therefore requires efficient EM tool support. Extensive efforts have been devoted to developing new EM tools and modelling techniques. Considerably less attention has been paid to the aspects of acquiring and introducing EM tools in organisations. Our grounded theory study shows that this process is far from simple. It is determined by the organisation's intentions regarding EM and by the situation in the EM user organisation. As a contribution to this, we present an EM tool acquisition process, which focuses on selecting an appropriate EM tool acquisition scenario for an organisation. This process has the following stages assessing the organisation, choosing an EM tool acquisition strategy, and following the EM tool acquisition strategy. We support the process of evaluating the situation at hand by providing guidelines for assessing intentional and situational factors that influence the use of EM tools. We also outline EM itself, along with its application process, and describe possible sources for gathering the requirements for an EM tool-set. Major requirements categories are discussed and analysed with respect to the goals and problems regarding EM tools. Each category of requirements can be satisfied to a certain degree, depending on the organisational needs and various situational factors. This grounded theory study provides two main contributions. Firstly, it proposes a systematic approach for EM tool acquisition supported by a set of guidelines. The approach enables an organisation to assess its needs of EM tools and its own appropriateness for EM tool usage. As a result, an EM user organisation is able to choose an EM tool acquisition strategy that meets the situation it faces. This is a contribution to the overall success of practical use of EM methods and tools. Secondly, it provides an important baseline for future research and theory building within the area of EM tool adoption and application. It also gives valuable information and requirements for development of new EM tools and related services.