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Introduction of web technology have made the current world a global village. And web design becomes a big challenge to make a better website. To make a user friendly interface and easy access environment of web page is the key issue of usability in this field. Better and user friendly interface of a web page becomes more popular. There are so many mistake occure when a designer develop end user interface of a web site. The main purpose of useability to provide a user friendly, easy access environment of a web page. This paper demonstrates a guide line of usability for better web site design.
Human being always tries to access internet in easy and user friendly environment. Therefore, designing user interface is the major concern of web site in the world. Easy user interface provides user friendly environment to access machine very easily and friendly. Usability engineering is very popular area that is concerned generally with human computer interaction especially making human computer interface that have user friendliness. It refers to methods for improving ease-of-use user interface. It is also quantitative attribute that measures how easy interface are to use.
According to the Nielsen (1993) "usability is the process of testing with a handful of techniques to gain learn-ability, efficiency, memorability, less errors and satisfaction". These five attributes are the basics of usability engineering .There are others with their own definition of attributes like Rubins (1994) for instance. He outlines four similar attributes, usefulness, effectiveness, learn-ability and attitude (Booth, 1989 in Rubins, 1994).
Usability means that the user who use the product can do so quickly and easily to accomplish their own tasks. This definition rests on four points:
(1) Usability means focusing on users;
(2) People use products to be productive;
(3) Users are busy people trying to accomplish tasks; and
(4) Users decide when a product is easy to use.
On the other hand, web design is the art and process of creating a single web page or entire web sites. Another way we can say that web design is the skill of creating presentation of contents usually hypertext or hyper media that is delivered to an end user through the world wide wave by way of web browser.
Benefits of Usability
There are so many benefits if a designer follow the the useability when develop a web site that are given bellow :
Higher revenues through increased sales
Increased user efficiency and satisfaction
Increased sales and revenues
Decreased training and support costs
Reduced development costs
Reduced support costs
Reduced development time and costs
Reduced maintenance costs
Return business to improve your competitiveness
Basic model of Usability in Website Design
From analysis about useability in web site design we findout that there are five basic steps of useability in website design that are given bellow :
Step-01, Requirements specification and analysis
To identify stakeholders, and understand their role of the project.
To identify the goals for the desired website from the perspective view of the user and the business.
To determine the user requirements and milestone usability requirements.
To evaluate existing web site.
To perform user interviews and surveys.
To perform a competitive analysis.
Step-02, Conceptual User Interface Design
To create a Content Inventory to account for all expected site content.
To illustrate site design and architecture at an abstract level.
To conduct a task analysis for discovering critical user requirements and preferences.
Step-03, Prototypes of design
To invent a site Map Diagram based on usability requirements.
To choose a Human Computer Interaction design approach for instances Anthropomorphic, Cognitive, Predictive modeling, or Empirical for prototype.
To quickly create visual representations of the site.
To evaluate usability through focus groups and user tests.
To justify this process until the user interface design and usability goals are met.
To interact with visual designers to develop prototypes and interface designs with actual content.
To build the final product.
To evaluate functionality of the web site through testing, quality assurance, usability testing, field-testing and so on.
To use feedback for improving the product.
Step-05, Documentation and Maintenance
From first to last during developing a project must be documentation.
To enhance the existing website as user requirements that is a part of maintenance.
To consider the feedback for new requirements, and develop the website.
Top ten mistake of web site design
According to the Jakob Nielsen's there are ten most mistake in wed design against users that are -
PDF files for online reading
Not changing the color of visited links
Not scalable text
Fixed font size
Page title with low search engine visibility
Anything that looks like an advertisement
Violating design convention
Opening new browser window
Not answering user questions
Guideline for designing and usability of website
When evaluating the design and usability of a website, designer must consider the above mistake and followings tasks:
It is very necessary for designer to know about the end users that means who interact with the interface.
Every sector always things as a user point of view and all activities in a project from the same view point.
When creator takes decision then required information to be there.
Error messages of the system should have actually meaning to the user and the messages help to tell the users how to fix the occurred problem.
Every instruction should have a defined sub process.
There are many mistake may be occurred when a user interact with the web interface, so every mistake should be fixable.
Designer always keep in mind about proper utilize of user's buffers that means no overload.
Every interface should maintain some constraints that means must be follow some rules and regulations.
Minimize the need for a mighty memory.
Always Interface will be simple.
The end user should always know what is happening during pressing some command.
The more designer do something, the easier it should be to do.
It is very important that the user should control the system but the system should not control the user. The user is the boss and the system should show it.
Remove unnecessary decisions.
The user should be able to do what the user wants to do.
Designer should always know how to find out what to do next.
The idea is to empower the user, not speed up the system.
Designer things that look different should act different.
Already we have written about useability of a website design. We see that useability is more important to develop a web site. To get better web site we should have to follow some guide lines. There are so many problems occure for violating guide line of useability. In the above we mentioned top mistake of web site design according Jakob Nielsen's. Designer should consider these mistakes and mentioned above guideline about useability of a website design that helps to develop a better web page interface. We think that above guide lines are more effective that helps to achieve useability benefits.
This paper concludes that the better guide line of web design to create a user friendly interface. There are many mistake occurs when designer developing an interface of web site and here we try to show how can we overcome the mistakes. Hopefully these above guidelines activities help designer to develop a better web site.