Introduction
Based on our website frustrations encountered in everyday life and while doing assignments, we decided to do a research in finding a method that makes the life easier. On our research, we found this topic, Website Usability. And also, we find that much research is going on this topic. As a support to that, we decided to spread this message through our literature review. Based on Fisher’s (2011) research, 70 percent of e-commerce website users do not purchase through website because of the difficulty and confusing design of websites.
Literature Review
This literature review addresses the basic concept of website usability, how it is measured, what is usability testing of website, what are the tools using for website usability testing, benefits of website usability, what are the disadvantages of website usability testing, what is the cost of doing website usability testing, and impacts. Through this literature review paper, we need to create awareness on why usability in website is important.
Website Usability
Usability is the product quality that enhances its user’s ability to use the product without any difficulties or frustrations. Usability in websites or website usability means the quality of the user interface design to perform the desired action of its user without any kind of confusions. According to Cappel (2007) website usability is measured on the learn ability, efficiency, and user satisfaction. Web usability depends on various features of design including website’s presentation, its navigational easiness, its functionality and its usefulness to users (Huang 2007).
Measuring Website Usability
Measuring the usability of a website depends on various factors like errors or bloopers, inconsistent usage of web conventions, lack of proper navigation, etc. Cappel (2007) categorizes different measures of usability into three groups. The three groups are web design errors, web design conventions, and design features to promote usability (Cappel 2007). The following section deals with the measures according to their classification.
Web design errors
Under design error classification Cappel (2007) puts the measures of web usability that should be avoided. One of the attractive features of websites is the use of splash screen while loading, this feature affects the usability of the website because it takes a long time to load than the normal screen. The other design error is the usage of horizontal scrolling creates frustration in finding out the information from the screen, which also contributes the usability error. Then, the other important measure is the self link on home page, because in some cases the home page may contain some changing pictures that may lead the users a misconception of new page when they click the self link (Cappel & Huang 2007).
Another measure according to Market Ease Business Promotions (2008) that comes under design errors is hiding important information in Business to Business (B2B) websites behind registration barriers well before creating trust or creating an impression that is relevant to the customers will lead them to lose customers who are concerned about junk mail and unwanted telemarketers.
Web Design Conventions
Cappel and Huang (2007) grouped some of the web usability measures that should be followed into design conventions. Examples for the measures under the web design conventions are the following: Link appearance, home page link from Logo, consistency in giving reference, and formats like color, font, page layout, content, etc. According to Nielsen and Loranger (2006), designers should not offer video streaming more than two minutes because it will bore the users.
Web Design Features
The web design features are those features that enhance the website usability. In this section, some of the features that enhance the website usability are discussed. One of such good design feature is Breadcrumb trail which shows the page where the user stands and also shows the path. This will help user to make sure them on right topic. The other good design feature, Site search capability, helps the user to go directly the topic the user need to read on. The FAQ or help option feature helps the user to manage the confusing features or latest features that added to the website (Cappel & Huang 2007).
According American Disability Act, designers need to enhance the usability of the website for the people with disability. For example, Designers need to give audio support for those websites of legal and essential thing (USACM 2008). Some other design features are ‘Add to cart button for B2C websites’, ‘Add to compare button for B2C websites’, Instructions to complete the task and error prevention. The website should use the terminologies, according to audience of the website (Hinchliffe2008).
In e-commerce websites like ebay, the websites usability is not only based on the front end design, but also depends on the back end design. In this case the usability is measured by considering the following factors: Scalability, Availability/Reliability, Security, Usability, and performance (Ahmed). Scalability means whatever the number of users accessing website simultaneously should be serviced without fail. Usability is the ability to perform multiple task or single task by different users at same time. Performance is the fast response time. For example booking a train ticket or making a bid.
Usability Testing of Websites
In general usability testing is the testing approach in which the tester watches how the product users perform typical task to achieve their goal (Barnum 2008). Usability testing of websites means observing the web users behavior in doing task in websites. It varies according to users and the purpose of websites.
Two different types of testing approach are there, formative testing and summative testing (Barnum 2008). Formative testing is an iterative testing done during the development cycle of the website. Hence it is done during development; it helps the developers to change the usability errors easily and tested again. But, Summative testing is done after the completion of development of the product and before the release. The advantage of summative testing is the testing of the whole product, and its result will be used during the future development of the product. The disadvantage is, the summative testing is too late to incorporate the result into the product.
The next important step is who and how many human resources needed to perform the usability test. Keeping an eye on strategy of business, the number of people involved in the usability testing process will vary (Barnum 2008). If the number is more, it will be a proof for the issues. According to Nielsen (2000), with the help of five users for testing, can able to find around 85% of the usability errors. More than five is a usability testing luxury. The other important criterion is the user selection. These five users should be selected from the expected audience or users of the particular website (Barnum 2008). For example, health care equipment selling websites, for this website the main users are those in the medical field, not the common people. According to Fisher (2011), reliability and validity in usability testing is achieved by participating users from variable background and characters. Based on this, we need to select the appropriate user.
Another stuff need to discuss is in usability testing is the requirement of a testing lab. But, according to Barnum (2008), there is no need to have a testing lab. But, based on research on web usability, in some cases the lab is required, for the advanced testing like eye tracking, and searching behavior need to done in lab. Nielsen (2009) finds that the eye tracking heat map shows the users tendency to read the websites in ‘F’ pattern.
The one of the most important step is to create the scenario for testing. That means setting of the boarders, range, and target testing goal. For example, if we are testing the usability of textile store website, here we can fix a target testing goal like websites interactive design to define and view outfit (Fisher 2011).
The next step is to decide the tools that we need to perform usability testing. This depends on the types and purpose of the websites. Then we need to proper note down the results.
Website Usability Testing Tools
Under this section, we are discussing some of the common tools that are used for usability testing of a website (Stalker 2008).
· Methodologies- usability, web metrics, interaction design, usability, human-computer interaction, usability engineering, user-centered design and accessibility.
· Planning, feasibility, and requirements- task analysis, icon intuitiveness testing and card sorting.
· Design- cognitive Walkthroughs and prototyping.
· Evaluation.
· Competitive analysis and benchmarking.
· Do-it-yourself usability tools and techniques.
· Software- click capture, visitor timing software and eye tracking software.
· Think out aloud (Barnum 2008).
· Eye tracking. According to Tullis and Djamasbi (2007), usability also deals with keeping the information where the users easily recognize.
Benefits
Nielsen (2001) elaborates the benefit of web usability from two dimensions: Users and Providers. According to users, the benefits are the following:
· Satisfaction on the task they performed in the website
· Comfortable in playing around the website
· Easy achievements of their goals without frustration
· Trust and confidence in using the website
According to provider’s point of view, the benefits are:
- Cheap development cost and lesser time consumption
- Lower support cost
- Minimized user errors
- Training time and cost is reduced
- Return on investment
Disadvantages
Web Usability has its own disadvantages are the following:
- It cannot satisfy all the users, especially in the case where users are from a broad range.
- Different ways of accessing websites
- It restricts the designers to attract the users by flashy design.
Costs
The cost of conduction usability testing of websites varies based on the factors included in the process (Barnum 2008). According to Barnum (2008), the cost will be a minimum of $5000 or may go up to $10,000. But for the business to customer websites, the cost will go up, because the usability testing is to be done both front end and back end of the websites. In this case it will go very high.
As mentioned earlier, if we are doing both approaches: formative testing and summative testing, the cost of usability testing will go high. The cost will also vary according to the audience of the website. The setting up of usability testing lab will also add up to the cost of usability testing.
Impacts
The following are the impacts of web usability:
- Productivity of users and providers increased
- B2C websites sales and revenues increased
- B2B websites created confidence and trust in customers
- Reduced the maintenance cost
- Increased the customer satisfaction
- American Government introduced an act called American Disability Act for websites
- Increased number of web usability testing
- Increased research on web usability
Conclusion
Through this literature review, we are providing some awareness on the topic website usability, how it is done, what are its benefits, disadvantages, cost and impact. Through this paper, we need to support the statement made by Scott (2009), which emphasize the need to make usability and design an integral part of the development process, at whatever rate it’s conducted
References
· Scott, K.M. 2009, Is usability Obsolete? Interactions – Design Fiction, New York, USA, ACM 16
· Nielsen, J. & H. Loranger 2006, Prioritizing Web Usability, New Riders Publishing ,Berkeley, CA
· USACM 2008, ACM U.S. Public Policy Committee (USACM) Universal Internet Accessibility Policy Recommendations
· Market Ease Business Promotions 2008, B2B vs B2C Website Design Usability, <http://www.marketease.com.au/news/latest/b2b_vs_b2c_website_design_usability.html>
· Hinchliffe, Anetta & Mummery, Kerry W. 2008, Applying usability testing techniques to improve a Health promotion website, Health Promotion Journal of Australia.
· Barnum, M. Carol 2008, Usability Testing of E-Learning: Easy, Effective, Affordable, eLearn Magazine, vol 2008, issue 4, ACM Publication.
· Nielsen, Jakob 2000, Why you only need to test with 5 users, useit.com, < http://www.useit.com/alertbox/20000319.html>
· Fisher, Julie 2011, Usability of complex information systems: Evaluation of user interface, CRC press Taylor and Francis group.
· Ahmed, U. M., eBay – ecommerce platform: A case study in Scalability, < http://www.cs.mcgill.ca/~mahmed26/eBay_Architecture_Study.pdf>
· Nielson, Jakob & Pernice, Kara 2009, Eyetracking web usability, New riders press, < http://www.useit.com/eyetracking/>
· Djamasbi, Soussan & Tullis, Thomas 2007, Gender preferences in web design: usability testing through eye tracking, Americas Conference on Information Systems
· Ruth, Stalker 2008, A guide to usability tools and techniques, <http://www.ruthstalkerfirth.com/pdf/tools.pdf>