Short Title: Towards a methodology for IV development

This paper presents a case study of the development of a visualisation to represent and explore the relationships between multiple hierarchical structures, specifically botanical taxonomies. The case study outlines the visualisation’s development from initial meetings with taxonomists, through the early visual sketches of their activities, and through to the prototype as it exists now after two rounds of usability testing. Qualitative user feedback was elicited from taxonomists who used the system, using standard techniques, taken from traditional usability methodologies such as direct observation, concurrent verbal protocols, video recording and software logs. Some difficulties and differences in the testing and stages of development arising from the Information Visualisation (IV) approach to the graphical display, as contrasted to a more standard Graphical User Interface (GUI), are noted and solutions proposed.