Albeit increased interest in the methods of qualitative process research among industrial marketing, organization and strategy scholars, only little discussion has taken place around process methods in the context of inter-organizational networks. Scholars have argued that as complex and dynamic structures, networks constitute a specific kind of phenomenon for scientific inquiry and thereby would deserve methodological attention on their own right. In this paper we aim to answer to this call by providing a review of longitudinal methods used in process research on business networks. Our aim is to increase the knowledge of longitudinal methods in this specific context through examination of research practice. A review of 39 studies investigating network processes – whether labeled as network change, dynamics, or process research – is used to scrutinize how researchers incorporate temporal dimension into the methods of data collection and analysis. The study reveals a number of methodological particularities of business network studies and identifies several emphases and also deficits in the use – and reporting – of methods. As a conclusion the authors produce four major recommendations to enrich network process research in the future. The study is particularly useful for IMP researchers conducting research on the dynamics of business relationships. At the same time it offers benchmark data to researchers at the broad domain of interorganizational network study on how longitudinal methods are actually used and how they could be used in the study of processes over time.