This paper introduces a set of PVS theories for modelling and analysis of usability and safety aspects of user interface software design. Our PVS theories crystallise general usability issues commonly addressed in user‐centred safety requirements, such as the ability to undo user actions, the visibility of operational modes, and the predictability of user interface behaviour. These requirements...

We present a new model-based approach that we are using to build commercial webbased applications. The user requirements together with a data model are formally specified in a graphical notation using the CREATIV toolset. The specification may be checked by animation before being automatically translated to Perfect notation. The Perfect Developer toolset uses automated reasoning to generate for...

design transforms the semi-formal requirements specification into a formal implicit specification, which will then be further refined into formal explicit specification by detail design. Detail design has two goals: (1) transforming implicit specifications of processes and functions, defined in modules into explicit specifications to serve as a foundation for implementation in a specific progra...

When the user interface should be specified, a picture is worth a thousand words, and the worst thing to do is write a natural language specification for it. Although this practice is still common, it is a challenging task to move from text-based requirements and problem-space concepts to a final UI design, and then back. Especially for user interface specification, actors must frequently switc...

It is common practice in the description of criteria for the acceptable safety of systems for the regulator to describe safety requirements that should be satisfied by the system. These requirements are typically described precisely but in natural language and it is often unclear how the regulator can be assured that the given requirements are satisfied. This paper is concerned with a rigorous ...

A logic model checker can be an effective tool for debugging software applications. A stumbling block can be that model checking tools expect the user to supply a formal statement of the correctness requirements to be checked in temporal logic. Expressing non-trivial requirements in logic, however, can be challenging. To address this problem, we developed a graphical tool, the TimeLine Editor, ...

Web-based information systems aim to enable people to live and do things in society with help of computer systems on internet. User interfaces and navigation structures of these systems become more important and critical than the ones of traditional information systems to the user because of the nature and specific characteristics of these systems. The experiences on requirements analysis and s...

UNLABELLED A significant problem with current health information technologies is that they poorly support collaborative work of healthcare professionals, sometimes leading to a fragmentation of workflow and disruption of healthcare processes. OBJECTIVE This paper presents two homecare cases, both applying multi-disciplinary thematic seminars (MdTS) as a collaborative method for user needs eli...