Developing Information Systems (ISs) is a hard task for which Requirements Engineering (RE) offers a good starting point. ISs can be viewed as a support for organisational communication. Therefore, we argue in favour of communication-oriented RE methods. This paper presents Communication Analysis, a method for IS development and computerisation. The focus is put on requirements modelling techniques. Two novel techniques are described; namely, Communicative Event Diagram and Communication Structures. These are based on sound theory, they are accompanied by prescriptive guidelines (such as unity criteria) and they are illustrated by means of a practical example.