Decision Making and Management of Dynamic Risk

Managing dynamic environments often requires decision making under uncertainty and risk. Two types of uncertainty are involved: uncertainty about the state and the evolution of the situation, and ‘openness’ of the possible actions to face possible consequences. In an experimental study on risk management in dynamic situations, two contrasted ‘ecological’ scenarios – transposed from effective situations of emergency management – were compared in order to identify the impact of their ‘openness’ in the subjects’ strategies for decision making. The ‘Lost Child’ scenario presented qualitative and irreversible consequences (child’s death) and high uncertainty; it exerted high demands both in risk assessment (risk representation) and action elaboration and choice. A less open situation (‘Hydrocarbon Fire’) required a main choice between two contrasted actions, with quantitative computable consequences. The strategies of ‘experimental subjects’ (university students) and ‘operative subjects’ (professional fire-fighter officers) were compared in order to evaluate the ecological validity of experimental research in this field, from the point of view of the subjects themselves. The two scenarios appeared to be independent, so that quite different models of decision making have to be hypothesised, differing by the importance of assessing risk and defining possible actions on the one hand, and by the process of choice on the other. ‘Experimental’ subjects dramatically differed from ‘operative’ subjects when confronted with the same scenario, particularly for the less technical but more demanding scenario. It is hypothesised that three components might account for the effect of the situations and for the differences between and within groups of subjects: importance of situation assessment, spatial abilities, and global orientation of activity in managing dynamic risk.     

Features of Decision-Making in Process Control Tasks: The Relevance of the Work Context

This paper is centred on evaluating some significant features of decision-making in process control tasks. The study was carried out in a petrol refinery, specifically, with distillation console operators. Operator verbalisations were recorded during the completion of two specific tasks and later categorised by raters using a list of cognitive categories. The inter-rater reliability was calculated together with qualitative evaluations of the main overlaps among the categories. From the raters’ evaluations, flow diagrams were drawn that represented the plans and tactics developed by operators and the implied cognitive processes (evaluation, prediction, action, etc.). We found that the operators began the tasks with a primary global situation assessment that determined the choice of whether to cope with the task ‘step by step’ or ‘globally’. The results showed two patterns of decision sequences made in normal adjustment performance or in problem situations. Other findings are related to the importance of characteristics such as prediction, anticipation, feedback and the role of the alarms selected by a situation assessment and individual characteristics.     

Requirements Management: A Cinderella Story

Why do the business requirements and the final software product often have little in common? Why are stakeholders, developers and managers reluctant to embrace a full requirements process? Why does everybody say, ‘We don’t have time for requirements’? Why is the potentially most beneficial part of the development process ignored or short-changed?  Following are some observations about why the real requirements for the product often go undiscovered. We will address this by focusing on the different concerns of the people involved in requirements.     

Socio-Technical and Soft Approaches to Information Requirements Elicitation in the Post-Methodology Era

The contributors to this special issue focus on socio-technical and soft approaches to information requirements elicitation and systems development. They represent a growing body of research and practice in this field. This review presents an overview and analysis of the salient themes within the papers encompassing their common underlying framework, the methodologies and tools and techniques presented, the organisational situations in which they are deployed and the issues they seek to address. It will be argued in the review that the contributions to this special edition exemplify the ‘post-methodological era’ and the ‘contingency approaches’ from which it is formed.     

The Context of Information Use in a Hospital as Simultaneous Similarity–Difference Relations

In the light of the developing discourse on the relative merits of ‘hard’ and ‘soft’ approaches to information systems development, we present a case study application of a methodology which attempts to dissolve such dualities. Personal Construct Psychology (PCP) offers, as a unity, the construing person who is both biology and culture. PCP argues that both the world and the person’s construct system are phenomenologically real and that the viability of any particular construct system depends only on its usefulness to the construing person. In this study, we used PCP to explore the organisational context of information use and distribution in a large hospital. We used repertory grids, a PCP technique, to elicit from 16 members of staff their personal construals of information from different sources in the hospital. The results highlight the relationship between meaningful information and meaningfully active relationships, a theme which we discuss in terms of the development of the hospital information system and in terms of the value of PCP in dissolving hard–soft dichotomies.     

Designing Paper Disasters: An Authoring Environment for Developing Training Exercises in Integrated Emergency Management

Discussion-based exercises are a prevalent form of training in emergency management, aimed at improving coordinative decision making between the various agencies involved in disaster response. In each exercise, small multi-agency groups of decision makers discuss potential courses of action within a fictitious disaster scenario presented as a textual narrative supported by visual materials. We present a cognitive engineering analysis of the problem of designing disaster scenarios for effective discussion-based exercises. The analysis was carried out through the development of a pilot authoring environment to establish and address the requirements of a training organisation in the UK. The pilot authoring environment embodies a simple theoretical model of the exercise process in which facts of a disaster scenario afford discussion of pertinent issues which are elicited by considerations fed to trainees. This representational scheme allows the authoring environment to complement and extend authors’ mental models of exercises, and thereby enhance five aspects of authoring: rationalisation; continuity of rationale; evolution; adaptability; and the integration of evaluation feedback.     

Frame rate as a QoS parameter and its influence on speech perception

The preservation of QoS for multimedia traffic through a data network is a difficult problem. We focus our attention on video frame rate and study its influence on speech perception. When sound and picture are discrepant (e.g., acoustic ‘ba’ combined with visual ‘ga’), subjects perceive a different sound (such as ‘da’). This phenomenon is known as the McGurk effect. In this paper, the influence of degraded video frame rate on speech perception is studied. It is shown that, when frame rate decreases, correct hearing is improved for discrepant stimuli and is degraded for congruent (voice and picture are the same) stimuli. Furthermore, we studied the case where lip closure was always captured by the synchronization of sampling time and lip position. In this case, frame rate has little effect on mishearing for congruent stimuli. For discrepant stimuli, mishearing is decreased with degraded frame rate. These results indicate that the stiff motion of lips resulting from low frame rate cannot give enough labial information for speech perception. In addition, the effect of delaying the picture to correct for low frame rate was studied. The results, however, were not as definitive as expected, because of compound effects related to the synchronization of sound and picture. Finally, we inspected the still pictures of normal Japanese speech and determined a lower limit of frame rate from the view point of assisting hearing.     

‘Working Well, Together’: Arts-Based Research and the Cultural Future of Small Cities

This article offers a research update on a 3-year programme initiated by the Kamloops Art Gallery and the University College of the Cariboo in Kamloops, British Columbia. The programme is supported by a ‘Community–University Research Alliance’ grant from the Social Sciences and Humanities Research Council of Canada, and the collaboration focuses on the cultural future of small cities – on how cultural and arts organisations work together (or fail to work together) in a small city setting. If not by definition, then certainly by default, ‘culture’ is associated with big city life: big cities are equated commonly with ‘big culture’; small cities with something less. The Cultural Future of Small Cities research group seeks to provide a more nuanced view of what constitutes culture in a small Canadian city. In particular, the researchers are exploring notions of social capital and community asset building: in this context, ‘visual and verbal representation’, ‘home’, ‘community’ and the need to define a local ‘sense of place’ have emerged as important themes. As the Small Cities programme begins its second year, a unique but key aspect has become the artist-as-researcher. Correspondence and offprint requests to: L. Dubinsky, Kamloops Art Gallery, 101–465 Victoria Street, Kamloops, BC V2C 2A9 Canada. Tel.: 250-828-3543; Email: ldubinsky@museums.ca     

MABA-MABA or Abracadabra? Progress on Human–Automation Co-ordination

In this paper we argue that substitution-based function allocation methods (such as MABA-MABA, or Men-Are-Better-At/Machines-Are-Better-At lists) cannot provide progress on human–automation co-ordination. Quantitative ‘who does what’ allocation does not work because the real effects of automation are qualitative: it transforms human practice and forces people to adapt their skills and routines. Rather than re-inventing or refining substitution-based methods, we propose that the more pressing question on human–automation co-ordination is ‘How do we make them get along together?’ Correspondence and offprint requests to: S. W. A. Dekker, Department of Mechanical Engineering, IKP, Link?ping Institute of Technology, SE - 581 83 Link?ping, Sweden. Tel.: +46 13 281646; fax +4613282579; email: sidde@ikp.liu.se     

SymGeons: A Prototype Model of Visual Complexity with Implications For Visual Control Tasks

The way in which humans perceive and react to visual complexity is an important issue in many areas of research and application, particularly because simplification of complex matter can lead to better understanding of both human behaviour in visual control tasks as well as the visual environment itself. One area of interest is how people perceive their world in terms of complexity and how this can be modelled mathematically and/or computationally. A prototype model of complexity has been derived using subcomponents called ‘SymGeons’ (Symmetrical Geometric Icons) based on Biederman’s original Geon Model for human perception. The SymGeons are primitive shapes which constitute foreground objects. This paper outlines the derivation and ongoing development of the ‘SymGeon’ model and how it compares to human perception of visual complexity. The application of the model to understanding complex human-in-the-loop problems associated with visual remote control operations, e.g. control of remotely operated vehicles, is discussed.     

The Use of a Formalised Risk Model in NHS Information System Development

Information systems (IS) and technology are used extensively throughout the National Health Service (NHS), and the 1998 national information strategy, ‘Information for Health’, sets out how the NHS will be developing and implementing IS to support patient care within the next decade. This new IS initiative is set against a mixed record of success of IS projects in the NHS, with a number of high-profile failures. This paper highlights the need to consider the ‘organisational issues’ involved in systems implementation to avoid failures. It goes on to advocate the use of a process-oriented and organisation studies-based model for risk analysis and management for use in NHS IS projects. Two famous NHS case studies are used to validate the model. It is concluded that there is a real need in the NHS for tools to better control the inherent risks involved in IS development and implementation. Ultimately, the success of IS projects in the NHS is crucial if they want to best utilise clinical and patient information, with the overall aim of improving the efficiency and standard of the nation’s health care.     

Effective Communication in Requirements Elicitation: A Comparison of Methodologies

The elicitation or communication of user requirements comprises an early and critical but highly error-prone stage in system development. Socially oriented methodologies provide more support for user involvement in design than the rigidity of more traditional methods, facilitating the degree of user–designer communication and the ‘capture’ of requirements. A more emergent and collaborative view of requirements elicitation and communication is required to encompass the user, contextual and organisational factors. From this accompanying literature in communication issues in requirements elicitation, a four-dimensional framework is outlined and used to appraise comparatively four different methodologies seeking to promote a closer working relationship between users and designers. The facilitation of communication between users and designers is subject to discussion of the ways in which communicative activities can be ‘optimised’ for successful requirements gathering, by making recommendations based on the four dimensions to provide fruitful considerations for system designers.     

Rule-based document structure understanding with a fuzzy combination of layout and textual features

Document image processing is a crucial process in office automation and begins at the ‘OCR’ phase with difficulties in document ‘analysis’ and ‘understanding’. This paper presents a hybrid and comprehensive approach to document structure analysis. Hybrid in the sense that it makes use of layout (geometrical) as well as textual features of a given document. These features are the base for potential conditions which in turn are used to express fuzzy matched rules of an underlying rule base. Rules can be formulated based on features which might be observed within one specific layout object. However, rules can also express dependencies between different layout objects. In addition to its rule driven analysis, which allows an easy adaptation to specific domains with their specific logical objects, the system contains domain-independent markup algorithms for common objects (e.g., lists). Received June 19, 2000 / Revised November 8, 2000     

Exploring agent support at the user interface in e-commerce applications

In this paper, we present some of the results from our ongoing research work in the area of ‘agent support’ for electronic commerce, particularly at the user interface level. Our goal is to provide intelligent agents to assist both the consumers and the vendors in an electronic shopping environment. Users with a wide variety of different needs are expected to use the electronic shopping application and their expectations about the interface could vary a lot. Traditional studies of user interface technology have shown the existence of a ‘gap’ between what the user interface actually lets the users do and the users’ expectations. Agent technology, in the form of personalized user interface agents, can help to narrow this gap. Such agents can be used to give a personalized service to the user by knowing the user’s preferences. By doing so, they can assist in the various stages of the users’ shopping process, provide tailored product recommendations by filtering information on behalf of their users and reduce the information overload. From a vendor’s perspective, a software sales agent could be used for price negotiation with the consumer. Such agents would give the flexibility offered by negotiation without the burden of having to provide human presence to an online store to handle such negotiations. Published online: 25 July 2001     

Interface-Me: Pursuing Sociability Through Personal Devices

In this paper we describe the fundamental principles that guide our work process at 5050 Ltd, in developing concepts and prototypes for personal technology devices. We maintain that in designing personal devices it is critical to address the social interaction elements of the user experience. We introduce the term “social functionality” to refer to those aspects of a device that are specifically designed to elicit sociability and serendipity. It also refers to those aspects which enable users to communicate or represent individuating characteristics through the use of their device. Social functionality is seen as a critical success factor in the design of future personal devices. Introducing social functionality in personal technology devices requires a multidisciplinary approach. Design and technology are seen as inseparable elements of the development process. The mbracelet¹, a wearable prototype we developed for, and in association with, NCR’s The Knowledge Lab, is used as a case in point.     

Linguistic Problems with Requirements and Knowledge Elicitation

Human and conversational aspects of requirements and knowledge identification are employed to show that requirements ‘engineering’ is not the same as civil engineering or scientific problem solving. Not only can requirements not be made fully explicit at the start of a project, they cannot be made fully explicit at all. A need is identified to enhance computer-based information systems (CBIS) development methods to accommodate: plurality of incommensurable perspectives, languages and agendas; dynamic representations of system features that can be experienced rather than abstracted and forced into an abstract paper-based representation; recognition that CBIS development is in general a continuous process where users changing their minds is a natural and necessary indication or organisational vitality.  It is suggested that prototyping and rapid application development go some way to addressing these requirements but that they require further development in the light of the theoretical light thrown on the nature of the problem.     

Direct linear sub-pixel correlation by incorporation of neighbor pixels' information and robust estimation of window transformation

Standard methods for sub-pixel matching are iterative and nonlinear; they are also sensitive to false initialization and window deformation. In this paper, we present a linear method that incorporates information from neighboring pixels. Two algorithms are presented: one ‘fast’ and one ‘robust’. They both start from an initial rough estimate of the matching. The fast one is suitable for pairs of images requiring negligible window deformation. The robust method is slower but more general and more precise. It eliminates false matches in the initialization by using robust estimation of the local affine deformation. The first algorithm attains an accuracy of 0.05 pixels for interest points and 0.06 for random points in the translational case. For the general case, if the deformation is small, the second method gives an accuracy of 0.05 pixels; while for large deformation, it gives an accuracy of about 0.06 pixels for points of interest and 0.10 pixels for random points. They are very few false matches in all cases, even if there are many in the initialization. Received: 24 July 1997 / Accepted: 4 December 1997     

Co-ordinating Distributed Knowledge: A Study into the Use of an Organisational Memory

This paper presents an ethnographically informed investigation into the use of an organisational memory, focusing in particular on how information was used in the performance of work. We argue that understanding how people make use of distributed knowledge is crucial to the design of an organisational memory. However, we take the perspective that an ‘organisational memory’ is not technology dependent, but is an emergent property of group interaction. In this sense, the technology does not form the organisational memory, but provides a novel means of augmenting the co-ordination of collaborative action. The study examines the generation, development and maintenance of knowledge repositories and archives. The knowledge and information captured in the organisational memory enabled the team members to establish a common understanding of the design and to gain an appreciation of the issues and concerns of the other disciplines. The study demonstrates why technology should not be thought of in isolation from its contexts of use, but also how designers can make use of the creative flexibility that people employ in their everyday activities. The findings of the study are therefore of direct relevance to both the design of knowledge archives and to the management of this information within organisations.     

Content-based navigation of music using melodic pitch contours

We describe a system which supports dynamic user interaction with multimedia information using content-based hypermedia navigation techniques, specialising in a technique for navigation of musical content. The model combines the principles of open hypermedia, whereby hypermedia link information is maintained by a link service, with content-based retrieval techniques in which a database is queried based on a feature of the multimedia content; our approach could be described as ‘content-based retrieval of hypermedia links’. The experimental system focuses on temporal media and consists of a set of component-based navigational hypermedia tools. We propose the use of melodic pitch contours in this context and we present techniques for storing and querying contours, together with experimental results. Techniques for integrating the contour database with open hypermedia systems are also discussed.     

A Comment on Kidd’s Characterisation of Knowledge Workers

Irrespective of the frequency to which it is referred, the concept of ‘knowledge work’ remains surprisingly ill defined and generally not well understood. In this paper we address one of the more insightful contributions by Kidd in 1994 and contrast her characterisation with our experience in a case study of a legal team. In general this shows strong correlation with her definitions of knowledge work but also raises interesting questions about some of her secondary characteristics. These lend support to the hypothesis that knowledge work is not a uniform area. Thus, it is inappropriate to generalise too much on attributes that are governed by the domain of expertise in search of a universal definition. However, there is sufficient common ground to believe that only a few major groups exist distinguished mainly by working practice, team and career structures.