System usability of complex technical systems

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Tossavainen, Teppo 2012-02-10T09:18:40Z 2012-02-10T09:18:40Z 2002-05-10
dc.identifier.isbn 951-22-5896-X
dc.identifier.issn 1456-9426
dc.description.abstract The system-wide usability of complex technical systems and particularly the complexity approach is not very visible in usability literature. The reason might be that the usability theories were originally created for computer systems, and ever since this user interface oriented approach has been used regardless of the industry. In this research, the system usability of complex technical systems is comprehensively studied in the case of a cellular network (GSM) by utilising complex system theory, biology, control theory and usability. In the theoretical framework, we study complex technical systems by viewing literature of complexity research and biology, as well as apply the theories to technological evolution. We study how complexity has been defined and how to reduce user-observable complexity. Following this, we introduce the concept of fitness landscapes and the NK model in engineering in order to study technical coevolution in multiple system cases. Fitness landscape is a useful model, as the product development can be considered as constant hill climbing in a dynamic, ever-changing landscape, where the moves are made by selecting different feature combinations for the product from a vast solution space. By examining technical coevolution in dynamic fitness landscapes, we also see how error and complexity catastrophes arise when the complexity of the product exceeds a certain limit. The empirical research concentrates on cellular telephone networks by studying the system usability of the networks from the operator's point of view. The empirical results are combined with the theoretical aspects to create new insight for system usability of complex hi-tech products. The construction explains how hi-tech companies live in coevolution with each other and external forces, in this way moulding each other's adaptive landscapes. We also give a definition for system usability with the aid of the effort the users must exert when deploying the system. By using this definition, the system usability of different technical systems could be measured and compared. Finally, we give some guidelines for improving system usability when designing complex technical systems. Good understanding of the described phenomena together with system usability expertise improves the chances of a hi-tech company in developing complex technical systems. en
dc.format.extent 253
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Acta polytechnica Scandinavica. IM en
dc.relation.ispartofseries 12 en
dc.subject.other Economics en
dc.title System usability of complex technical systems en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Industrial Engineering and Management en
dc.contributor.department Tuotantotalouden osasto fi
dc.subject.keyword usability en
dc.subject.keyword system usability en
dc.subject.keyword complex technical systems en
dc.subject.keyword cellular telephone networks en
dc.subject.keyword wireless networks en
dc.subject.keyword technical fitness landscapes en
dc.subject.keyword technical coevolution en
dc.identifier.urn urn:nbn:fi:tkk-001442
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en

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