Enterprise Systems Implementation Methodology (ESIM) is considered to be a critical factor for successful Enterprise Systems (ES) implementations. In spite of ESIM’s potential and significance for practice, little attention has been paid to this object of study in ES literature. Current studies reveal contradictory findings regarding its potential value and provide a fragmented understanding of it. This paper, therefore, addresses the following research question: What characterizes an ESIM? and suggests that ESIM can be interpreted in terms of its characterizing aspects, i.e. formalized, relational and emergent. This interpretation provides guidance in assessing ESIM in practice and lays the groundwork for useful follow-on research. Since ESIM might be regarded as one of the latest interventions undertaken in an attempt to improve the quality of an ES product and the productivity and quality of an implementation process, this study retains valuable insights of prior works in Information Systems Development research.