Usability Ratings for Everyday Products Measured With the System Usability Scale

This article characterizes the usability of 14 common, everyday products using the System Usability Scale (SUS). More than 1,000 users were queried about the usability of these products using an online survey methodology. The study employed two novel applications of the SUS. First, participants were not asked to perform specific tasks on these products before rating their usability but were rather asked to assess usability based on their overall integrated experience with a given product. Second, some of the evaluated products were assessed as a class of products (e.g., “microwaves”) rather than a specific make and model, as is typically done. The results show clear distinctions among different products and will provide practitioners and researchers with important known benchmarks as they seek to characterize and describe results from their own usability studies.     

The Relationship Between System Effectiveness and Subjective Usability Scores Using the System Usability Scale

This article examines the relationship between users’ subjective usability assessments, as measured using the System Usability Scale (SUS), and the ISO metric of effectiveness, using task success as the measure. The article reports the results of two studies designed to explore the relationship between SUS scores and user success rates for a variety of interfaces. The first study was a field study, where stereotypical usability assessments on a variety of products and services were performed. The second study was a well-controlled laboratory study where the level of success that users were able to achieve was controlled. For both studies, the relationship between SUS scores and their attendant performance were examined at both the individual level and the average system level. Although the correlations are far from perfect, there are reliable and reasonably strong positive correlations between subjective usability measures and task success rates, for both the laboratory and field studies at both the individual and system level.     

Towards a Standard Arabic System Usability Scale: Psychometric Evaluation using Communication Disorder App

This research aims to customize the System Usability Scale (SUS) so it can be used as a standard usability measure on native Arabic-language speakers. A process of rigor translation followed by psychometric evaluation has been administered through a questionnaire in the Arabic-language that reflects a reasonable level of reliability, validity and sensitivity when compared to the original English-language SUS questionnaire. The final result of the Arabic-System Usability Scale (A-SUS) is then applied on students majoring in Communication Disorders Sciences (Kuwait University) to measure the usability of a mobile application. A-SUS encapsulates the essence of the original SUS and provides an adequate tool for professionals to use with Arabic native speaking users to evaluate systems usability.     

Perspective-based Usability Inspection: An Empirical Validation of Efficacy

Inspection is a fundamental means of achieving software usability. Past research showed that the current usability inspection techniques were rather ineffective. We developed perspective-based usability inspection, which divides the large variety of usability issues along different perspectives and focuses each inspection session on one perspective. We conducted a controlled experiment to study its effectiveness, using a post-test only control group experimental design, with 24 professionals as subjects. The control group used heuristic evaluation, which is the most popular technique for usability inspection. The experimental design and the results are presented, which show that inspectors applying perspective-based inspection not only found more usability problems related to their assigned perspectives, but also found more overall problems. Perspective-based inspection was shown to be more effective for the aggregated results of multiple inspectors, finding about 30% more usability problems for 3 inspectors. A management implication of this study is that assigning inspectors more specific responsibilities leads to higher performance. Internal and external threats to validity are discussed to help better interpret the results and to guide future empirical studies.     

A Slovene Translation of the System Usability Scale: The SUS-SI

The System Usability Scale (SUS) is a widely adopted and studied questionnaire for usability evaluation. It is technology independent and has been used to evaluate the perceived usability of a broad range of products, including hardware, software, and websites. In this article we present a Slovene translation of the SUS (the SUS-SI) along with the procedure used in its translation and psychometric evaluation. The results indicated that the SUS-SI has properties similar to the English version. Slovene usability practitioners should be able to use the SUS-SI with confidence when conducting user research.     

复杂信息系统界面可用性指标体系研究

随着复杂信息系统在军事领域和民用领域的广泛应用及不断发展,人们对复杂信 息系统显示界面的设计有了更高层面的要求。通过可用性评估指导复杂信息系统界面设计改良, 降低系统复杂性带给用户的工作认知负荷,提高用户绩效成为亟待解决的问题。针对复杂信息 系统界面进行了研究,从界面特征、任务特征、认知特征进行了分析,提出了界面复杂性的影 响因素,构建了复杂度评估指标体系,采用层次分析法针对界面的复杂性的指标权重进行了研 究,并根据构建的复杂度模型提出了相应的可用性指标体系。     

CBID系统的可用性评估

本文采用用户测试法和用户调查法对CBID(Case Based Industrial Design)系统进行评估分析。通过对可用性评估结果的分析,进一步为CBID系统与ICAID系统可用性对比研究提供根据。     

面向可用性评估的协同工作系统建模

在开发以使用为中心的协同工作系统中,越来越要求在早期就能发现并修正可用性方面的缺陷,这就要求评估者对被评估系统的使用上下文有清晰的理解,进而要求在协同工作任务模型上得到充分的支持.然而,现有的界面模型和面向单用户的可用性评测技术却不能有效地覆盖最基础的协作原子行为和团队协作的上下文信息,于是从面向评估的角度提出了一种新的协同工作系统描述模型,在模型上应用快速评估方法中的遍历技术,通过迭代地模拟真实环境中系统的使用状况,可以实现低成本的早期可用性评估.实验表明,该方法较几种传统方法有一定的优势.     

The System Usability Scale: Past,Present, and Future

The System Usability Scale (SUS) is the most widely used standardized questionnaire for the assessment of perceived usability. This review of the SUS covers its early history from inception in the 1980s through recent research and its future prospects. From relatively inauspicious beginnings, when its originator described it as a “quick and dirty usability scale,” it has proven to be quick but not “dirty.” It is likely that the SUS will continue to be a popular measurement of perceived usability for the foreseeable future. When researchers and practitioners need a measure of perceived usability, they should strongly consider using the SUS.     

An Empirical Evaluation of the Convex SPP-1000 Hierarchical Shared Memory System

Cache coherency in a scalable parallel computer architecture requires mechanisms beyond the conventional common bus based snooping approaches which are limited to about 16 processors. The new Convex SPP-1000 achieves cache coherency across 128 processors through a two-level shared memory NUMA structure employing directory based and SCI protocol mechanisms. While hardware support for managing a common global name space minimizes overhead costs and simplifies programming, latency considerations for remote accesses may still dominate and can under unfavorable conditions constrain scalability. This paper provides the first published evaluation of the SP-1000 hierarchical cache coherency mechanisms from the perspective of measured latency and its impact on basic global How control mechanisms, scaling of a parallel science code, and sensitivity of cache miss rates to system scale. It is shown that global remote access latency is only a factor of seven greater than that of local cache miss penalty and that scaling of a challenging scientific application is not severely degraded by the hierarchical structure for achieving consistency across the system processor caches.     

车载计算机系统可用性评价指标体系研究

针对目前车载计算机系统可用性研究中缺少可用性评估指标体系的问题,进行了深入地分析与研究,首先研究了构建车载计算机系统可用性评估体系的基本原则,分析了可用性评估的主要内容,最后提出了可用性评估的指标体系．研究结果表明：可用性评价一方面能从用户角度反映车载计算机系统存在的问题,为设计者决策提供依据,另一方面也能为供应商改进系统性能提供参考．     

A Usability Checklist for the Usability Evaluation of Mobile Phone User Interface

In the last decade, the research of the usability of mobile phones has been a newly evolving area with few established methodologies and realistic practices that ensure capturing usability in evaluation. Thus, there exists growing demand to explore appropriate evaluation methodologies that evaluate the usability of mobile phones quickly as well as comprehensively. This study aims to develop a task-based usability checklist based on heuristic evaluations in views of mobile phone user interface (UI) practitioners. A hierarchical structure of UI design elements and usability principles related to mobile phones were developed and then utilized to develop the checklist. To demonstrate the practical effectiveness of the proposed checklist, comparative experiments were conducted on the usability checklist and usability testing. The majority of usability problems found by usability testing and additional problems were discovered by the proposed checklist. It is expected that the usability checklist proposed in this study could be used quickly and efficiently by usability practitioners to evaluate the mobile phone UI in the middle of the mobile phone development process.     

基于网络的产品可用性评价系统的设计与实现

随着科学技术的不断发展和产品智能化水平的不断提高,产品的可用性已是消费者决定是否购买产品的主要因素,因此,提高产品的可用性已成为提高产品竞争力的核心。如何保证设计的产品既符合用户的需求又方便易用,即可用性问题,成为必须不断深入研究的问题。论文将目前国内外企业针对界面设计的可用性理论引入到工业产品设计中,从产品设计的角度对工业产品的可用性评估原则、流程和方法进行了探讨性研究。     

一种基于可用度的Web服务可用性测量模型

Web服务通常运行于一个动态和开放的网络环境中,其底层平台与面向的用户千差万别,这使得Web服务的可用性经常不能得以保证。如何对Web服务可用性进行合理评估并提高服务质量是一个具有挑战性的研究课题。从服务请求者的角度出发,设计一种基于可用度的Web服务可用性测试模型,通过采集原始指标数据对服务质量进行可用度量化评估,为服务请求者选择更佳的Web服务提供参考依据。     

IT产品的可用性测试与评估

可用性测试与评估是可用性工程的重要组成部分。该文首先提出可用性质量的指标体系,它为衡量和改进产品的可用性质量提供了参照系和必要的基础,然后重点介绍几个用户评估与专家评估方法,最后给出一个可用性用户评估的实例。     

AHP标度改进研究及其在IDS评估中的应用

传统的层次分析法的“1～9标度”方法不能精确的反映人的实际思维,尤其是在构权时可能会影响最终的判断结果,本文提出了一种基于三角模糊数表示的改进的AHP标度方法,使AHP构权更加符合人的比较思维。最后本文给出入侵检测系统评估指标体系构权实例,结果证明,与传统方法对比,应用三角模糊数方法构权能够更加精确的反应人的实际思维。     

AHP标度改进研究及其在IDS评估中的应用

传统的层次分析法的“1-9标度”方法不能精确的反映人的实际思维，尤其是在构权时可能会影响最终的判断结果，本文提出了一种基于三角模糊数表示的改进的AHP标度方法，使AHP构权更加符合人的比较思维。最后本文给出入侵检测系统评估指标体系构权实例，结果证明，与传统方法对比，应用三角模糊数方法构权能够更加精确的反应人的实际思维。     

An Empirical Study of Use Contexts in the Mobile Internet,Focusing on the Usability of Information Architecture

The mobile Internet—accessing the Internet via a mobile device—has become quite popular recently. The mobile Internet is mainly different from the stationary Internet because it may be used in various contexts, whereas the stationary Internet is mostly used in pre-determined environments. However, it is unclear when the mobile Internet is used most frequently, and in what context it is most useful. A greater understanding of the contexts for using the mobile Internet will relieve usability problems that mobile Internet users often encounter.This paper proposes a conceptual framework of use contexts, which includes various facets of contexts related to the mobile Internet. It then presents the results of an exploratory study in which the use contexts for the mobile Internet and corresponding usability problems have been empirically monitored. The results indicate that use of the mobile Internet is heavily clustered around a few key contexts, rather than dispersed widely in diverse contexts. Moreover, different contexts are found to cause different kinds of usability problems. The paper ends with theoretical and practical implications of the study results.     

Psychometric Evaluation of the T-CSUQ: The Turkish Version of the Computer System Usability Questionnaire

This article describes the development of a standardized computer system usability questionnaire for use with speakers of the Turkish language, the Turkish Computer System Usability Questionnaire, Short Version (T-CSUQ-SV). This new questionnaire, based on the English-language CSUQ, underwent careful translation and transformation through comprehensive psychometric evaluation. The results of the psychometric evaluation revealed an acceptable level of reliability, appropriate construct validity, and sensitivity to manipulation, indicating that Turkish usability practitioners should be able to use the T-CSUQ-SV with confidence when conducting user research.     

基于日志分析的移动应用可用性综合评估体系的研究

移动应用已经成为人们日常生活中不可缺少的部分,可用性成为影响移动应用竞争力的主要因素,也是目前移动应用中一个突出问题。可用性是判断产品好坏的一个核心要素,如果一个产品的可用性评价得分很高,那么极有可能会为企业带来庞大的用户量,采用合适的方式变现就可以实现经济效益,因此如何提高产品的可用性对于企业来说极其重要。移动应用可用性评价的关键是建立一套合理、完善的评价指标体系。本文首先对常用的指标体系进行了比较分析,然后针对移动应用便携性的特点,提取本文所需要的指标与测度参数,建立移动应用的可用性指标体系,最后通过日志分析和数据挖掘等方法完成移动应用可用性的评价研究。