Essay Title: 

HCI

March 18, 2016 | Author: | Posted in internet, technology

Human-Computer Interaction

Scenarios and Use Cases Approaches in

Task Analysis and Interface Design

Introduction

The past decades have seen a great deal of Human-Computer Interaction (HCI ) research effort in the search for appropriate representations to support user interface tasks . Informal requirement representations , such as statements in natural language , are often supportive in overcoming the difficulty of communication between people with different backgrounds . However , natural languages suffer from ambiguity and imprecision . Formal requirement representations , on the other hand provide a solution to the ambiguity problem and facilitate formal proof and [banner_entry_middle]

analysis of properties of requirements . Such requirements form the basis of formal software development and verification of implementation correctness , however , such requirements are often difficult to understand and develop for newcomers to this area

Semi-formal requirement representations such as scenarios and use cases are promising vehicles for eliciting , specifying and validating user interface requirements . User interface designers look at scenarios and use cases as an effective means to discover user needs , to better embed the use of systems in work processes , and to systematically explore system behaviour under both normal and exceptional situations . Scenarios and use cases have gained enormous popularity after Ivar Jacobson introduced use case modelling which is now an important feature of the Unified Modelling Language (UML ) for systems engineering based on object-oriented approaches . Scenario and use case-based approaches have proved to be an effective mechanism to capture requirements and make them available for review without any implementation bias in the requirement

Considering the inadequacy of scenario and use case-based approaches and their poor integration with techniques for modelling the underlying functional application of the interactive systems , the main aim of this is to remove this dichotomy using an appropriate approach for modelling the entire interactive system . This describes a scenario and use case-based task analysis and design framework for user interfaces . The main idea behind the framework is that analyst or designer understanding of the users ‘ needs is the proper basis for interactive systems development . With a systematic process of building user interfaces to support users ‘ tasks , a higher level of usable and useful systems can be achieved . Scenarios and use cases are not the only existing approach for handling user interface requirements . The framework presented in this builds on existing techniques , but it also adds some personal insights

Scenarios in Task Analysis for Human Interaction

In the past decades , HCI community proposes a large variety of scenario-based approaches emphasizing more on user-oriented perspectives in developing interface systems . Scenarios promote shared understanding of the current situation and joint creativity toward the future[1 , 2] The main purpose of introducing scenarios is to stimulate thinking , e .g scenarios are “a creative tool that facilitates the leap from observation to invention “[3] . This is also apparent in Carroll ‘s definition of the concept “The defining property of a scenario is that it projects a concrete of activity that the user engages in when performing a specific task , a sufficiently detailed so that design implications can… [banner_entry_footer]

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