This paper presents examples of different aspects of design in a disability context with the aim of revealing some of its fundamentals. It particularly emphasizes situated aspects of research: the need for being there, with the users in their daily lives – where the action is.

In this paper I will discuss models of abduction from an interrogative viewpoint. However, my interrogative viewpoint will not be as radical as the interrogative logic of inquiry developed by Jakkoo Hintikka and his collaborators. Hintikka's interroga-tive logic (1998, Hintikka et al. 2000) starts from the assumption that all newly ac-quired information in scientific discovery must be obtained from a reliable informa-tion source. This source is abstractly viewed as an oracle which gives answers to our questions. In scientific discovery, the ultimate oracle is nature itself − as it presents itself in observations or controlled experiments. Therefore, in Hintikka's interrogative theory of inquiry only two basic and irreducible steps of inquiry are needed: (1.) logico-deductive inference steps, in which one acquires information from other pre-viously acquired information, and (2.) interrogative moves, i.e. question-answer steps, where one puts questions to nature in form of experiments and obtains certain answers from these experiments. Non-deductive or ampliative inference steps such as induction or abduction do not literally exist in Hintikka's interrogative theory of in-quiry: they are reduced to interrogative steps, to question-answer-steps.

In quality improvement projects—such as Six Sigma projects—an exploratory phase

In recent decades, non-monotonous, informal patterns of reasoning have awakened a renewed interest among psychologists, economists and educationalists. Computer scientists and information systems professionals could also benefit from getting better acquainted with new research on how people think and act in the real world. The purpose of the paper is not to make an empirical contribution but to present a general argument in favour of a psychological approach to logic and its application to Human Computer Interaction (HCI), focusing especially on abduction. Abduction is a form of everyday reasoning that people typically use under uncertainty in a context. Abduction may help us better understand the epistemic conditions of advanced HCI – which increasingly takes place in authentic surroundings instead of in a laboratory-like setting – thus contributing to better research and design. HCI design should enhance our natural capacities and behaviour, which at the same time could mean creating new freedoms in the structures of everyday life.