Priciples design is a design which was to follow a number of principles. It makes the web application will easily meet the usability of the user. It is effective, the ability to learn, error rate, ...3.1.1 Visibility of system statusThe system must always let users know about what is happening. That through appropriate feedback within reasonable time.3.1.2 Match between system and the real worldThe system must have the language, words, phrases and concepts familiar to the user. By Convention, the system must make information appear in a reasonable manner.3.2.3 User control and freedomWhen users use the system. Often users will often choose the wrong function or the curious to leave unwanted situation. So the system needed for the user to a function return or escape out unwanted status without having to go through extended dialogue.3.1.4 Consistency and standardsPeople don't need have to wonder whether different words, situations, or actions mean the same.3.1.5 Error preventionA good design and careful will help prevent some unwanted problems occur or in the first place. This will better the error message. The system should remove some condition or change some of the functions are prone to error. When system error should give existing users with several options of confirmation before they committed the Act.3.1.6 Recogintion rather than recallShould minimize the user's memory load by making objects, actions and options can visible. The user can not balance have to remember information from one part of the dialogue to another. Instructions for use of the system should be visible and can be easily recovered.3.1.7 Flexibility and efficiency of useThe system needs to speed up the interaction for the new user. As such, the system will be able to meet for experienced users and lack of experience.3.1.8 Help users recognize, diagnose, and recover from errorsNotice or help users should be expressed in simple language, exactly point out the problem and rebuild the problem accordingly.3.1.9 Help and documentationThe system can be used without documentation that users can use it. That would be better. But the system needs a guide. Because it will focus on the main task of the fifth — use. A detailed description, lists specific steps to perform the task.
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