【作者】 杨蒙；

【导师】 华庆一；

【作者基本信息】 西北大学 ， 计算机软件与理论， 2008， 硕士

【摘要】 HTA(Hierarchical Task Analysis),即层次任务分析。它是HCI领域的核心技术,被誉为“几乎可以用于任何环境”及“最著名”的任务分析技术,是一种描述目标及其子目标层次体系的方法,通常用于分析人类要完成的目标或者机器系统要完成的任务,已经被广泛研究和应用了近40年。本文围绕HTA的应用以及HTA的计算机辅助工具展开了一系列工作,主要有:首先,本文对HTA方法及其应用研究现状进行了梳理、总结及简要介绍。在此基础上,分析了HTA计算机辅助工具的用户群以及HTA多通道工具的必要性。其次,本文就HTA方法在UI可用性评估领域中的应用进行了深入研究。结合HTA在该领域的应用研究现状,针对低保真原型以及一些因实验条件有限无法进行正式的用户测试或满意度评估的系统,本文给出了一种基于HTA的UI可用性评估方法:HUGE,并以包裹单填写系统为例实践验证了HUGE,实践在一定程度上表明了HUGE的可行性及有效性。在HUGE实践过程中,本文根据评估结果对包裹单填写系统原UI进行了升级,新UI经评估具有较好的可用性。由于HUGE利用HTA层次图输出对UI可用性评估中的用户满意度及有效性进行了量化,故该实践也间接说明了HTA对于用户满意度及有效性的可用性评估在一定程度上是有效的。最后,根据对HTA方法的研究,结合HTA计算机辅助工具的相关分析,本文设计了纸笔隐喻界面与桌面隐喻界面相结合的HTA多通道工具UI,并据此实现了一个支持HTA方法的多通道工具原型。它既通过笔和语音输入、人类熟悉的命令手势完成HTA层次图以拓宽人机(HTA分析人员与计算机)交互带宽,又通过网络远程沟通以增强人与人(HTA分析人员与被分析对象)之间的信息交流带宽。原型系统支撑HTA方法,而HUGE是以HTA为理论基础的应用研究,故原型系统也支持HUGE中HTA层次图的制作。更多还原

【Abstract】 HTA(Hierarchical Task Analysis)is a core technique of HCI,and is "used in almost every circumstance"and the "best known" task analysis technique,and is a method to describe the hierarchical system of the goal and its sub-goal,and is often used to analyse the goals of human beings or the tasks of the machine systems,and has been widely researched and used for about 40 years.This paper focuses on the application of the HTA and the HTA computer-aided tool as follow:Firstly,the paper summarizes and briefly introduces the HTA method and the status of the research on its applications,and also analyses the user groups of the HTA computer-aided tool and the necessity of the HTA Multi-modal tool.Secondly,the paper studies the HTA application in UI usability evaluation field.Based on the current status of this field,for low-fidelity prototypes and some systems which can not be evaluated by the formal user testing and user satisfaction evaluation,the paper gives an HTA-based UI usability evaluation method:HUGE, and validates the HUGE by the practice with an example of the post package bill filling system.This practice indicates the feasibility and the validity of the HUGE to a certain extent.In the practice,the paper updates the existing UI of the post package bill filling system,and the new UI provides better usability after evaluations.Because that the HUGE scales the user satisfaction and effectiveness based on the HTA hierarchical output,this practice indirectly indicates that HTA is useful to a certian extent in the effectiveness and user satisfaction related usability evaluations.Lastly,based on the research of the HTA method,with the analysis of the HTA computer-aided tool,the paper designs the HTA Multi-modal tool prototype UI with the paper-based metaphor and the desk-based metaphor,and implements the HTA Multi-modal tool prototype which expands the human-machine(HTA analyzers and computers)interaction bandwidth by finishing the HTA hierarchical outputs with the pen and voice input and the familiar command gestures of human beings,and enhances the human-human(HTA analyzers and people analysed)information exchange bandwidth by the network remote communications.The HTA Multi-modal tool prototype supports the HTA method,but the HUGE method is the application based on the HTA method,so this prototype also supports to make the HTA. hierarchical outputs of the HUGE method.更多还原