Joyce Karreman

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The use and the effects of different information types in user instructions are not completely clear. Research showed that procedural information (information about the actions) is the most important information type during use. Research results about the effects of declarative information (explanatory information) are not conclusive. It is known that users(More)
Background The W3C Web Accessibility Initiative has issued guidelines for making websites better and easier to access for people with various disabilities (W3C Web Accessibility Initiative guidelines 1999). Method The usability of two versions of a website (a non-adapted site and a site that was adapted on the basis of easy-to-read guidelines) was tested(More)
BACKGROUND Antimicrobial resistance poses a threat to patient safety worldwide. To stop antimicrobial resistance, Antimicrobial Stewardship Programs (ASPs; programs for optimizing antimicrobial use), need to be implemented. Within these programs, nurses are important actors, as they put antimicrobial treatment into effect. To optimally support nurses in(More)
Improving the usability of government portal sites requires a focus shift from system to user in both research and design. Empirical studies into user behavior are needed to support decisions on navigation, labeling and search systems. This paper presents such a study. Through scenario based interviews data were collected on citizens’ information seeking(More)
In this paper we describe an experiment aimed at determining the most effective and natural orientation of a virtual guide that gives route directions in a 3D virtual environment. We hypothesized that, due to the presence of mirrored gestures, having the route provider directly face the route seeker would result in a less effective and less natural route(More)
Research problem: The purpose of this study was to investigate the effects of two types of motivational elements-verification steps and personal stories-in an instruction manual for a cell phone targeted at senior users (between 60 and 70 years). Research questions: What are the effects of adding verification steps and personal stories to an instruction(More)
An experiment was carried out to investigate whether it is useful to add system information to procedural information in instructional text. It was assumed that readers of instructions construct both a procedural and a system mental model, and that the latter enables the readers to infer possible missing information in procedural instructions. Moreover, it(More)
This paper describes a large-scale project to improve the effectiveness of knowledge base (KB) articles on a support website in solving problems experienced by novice to intermediate computer users. The project encompasses the structure of the content, the quality of the writing and graphics, and the user interface presentation. In addition, we are(More)
This paper gives an overview of three studies that we conducted to investigate the effects of motivational elements in user instructions. We tested for effects on usability, in particular on task effectiveness, task efficiency and user satisfaction. Motivational elements are textual additions or modifications to user instructions with the aim of motivating(More)