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Have you ever been frustrated with that IT system at work that does not behave the way you expect it to? Or had problems with using the features on your new mobile phone? When systems and appliances do not support us in what we are doing, and do not behave the way we expect them to, then usability is neglected. Poor usability may be frustrating and irritating when trying out your mobile phone, but in a critical work situation poor usability may be disastrous.

In this thesis, user-centred systems design (UCSD) is advocated as an approach for facilitating the development of usable interactive systems. Systems that suit their intended use and users do not just “emerge”. They are the result of a UCSD process and a user-centred attitude during the development. This means in short that the real users and their needs, goals, context of use, abilities and limitations, drive the development – in contrast to technology-driven development. We define UCSD as: a process focusing on usability throughout the entire development process and further throughout the system life cycle. I argue that this definition along with a set of key principles do help organisations and individual projects in the process of developing usable interactive systems. The key principles include the necessity of having an explicit focus on users and making sure that users are actively involved in the process.

The thesis provides knowledge and insights gained from real-life situations about what UCSD is and how it can be put into practice. The most significant results are: the proposal of a clear definition of UCSD and a set of key principles encompassing UCSD; a process for usability design and the usability designer role. Furthermore, design cases from different domains are provided as examples and illustrations.

IT systems with poor usability are a serious problem in many workplaces. Many workers, particularly office workers, spend a large part of their workday at the computer, and usability problems can cause frustration and impact negatively on productivity. This thesis discusses some of the problems associated with addressing usability and users’ needs in IT systems development.

Usability issues and users’ needs are often marginalised or even abandoned in systems development. Technical issues and deadlines are given precedence, while usability activities and user activities are cut back or cancelled. Research shows that there are various obstacles to usability and user involvement, including difficulties with understanding the usability concept, insufficient usability expertise and a lack of time and resources.

This thesis presents a number of studies that look at the problem from different angles. The main question is why usability and users’ needs are marginalised in bespoke systems development, where IT systems are built for a specific work context. The research presented in this thesis also addresses user-centred systems design as a way of integrating usability issues and users’ needs into systems development. The thesis concludes with a discussion about different ways of viewing and representing the users’ work: the systems theoretical view and the view of work as a social process. The former emphasises the formal aspects of work and views users as components in an overall system, whereas the latter focuses on work as a social process and people as active agents. The discussion concludes with the argument that the conflict between these two views is played out in the systems development process, which may help explain some of the difficulties that arise when working with usability and users’ needs.