Usability Engineering Topic Of Presentation:.:: General Guidelines::.
What is Guideline?A detailed plan or explanation to guide you in setting standards or determining a course of actionA rule or principle that provides guidance to appropriate behaviorA guideline is any document that aims to streamline particular processes according to a set routine
Guidelines may be issued by and used by any organization (governmental or private) to make the actions of its employees or divisions more predictable, and presumably of higher quality.Contd. . .
In any given project, several different levels of guidelines should be used General guidelines are applicable to all user interfaces Category-specific guidelines are for the kind of system being developed e.g. Guidelines for: Window-based administrative data processing Voice interfaces accessed through telephone keypads Product-specific guidelines are for the individual product.General Guidelines in U.E
Visibility of system status:The system should always keep usersinformed about what is going on, throughappropriate feedback within reasonable time.
Match between system and the real world: The system should speak the users language,with words, phrases and concepts familiar tothe user, rather than system-oriented terms.Follow real-world conventions, makinginformation appear in a natural and logicalorder.
User control and freedom:Users often choose system functions bymistake and will need a clearly marked"emergency exit" to leave the unwantedstate without having to go through anextended dialogue. Support undo and redo.
Consistency and standards:Users should not have to wonder whetherdifferent words, situations, or actions meanthe same thing. Follow platformconventions
Error prevention:Even better than good error messages is acareful design which prevents a problemfrom occurring in the first place.Either eliminate error-prone conditions orcheck for them and present users with aconfirmation option before they commit tothe action
Recognition rather than recall :Minimize the users memory load by makingobjects, actions, and options visible. The user should not have to rememberinformation from one part of the dialogue toanother.Instructions for use of the system should bevisible or easily retrievable wheneverappropriate.
Flexibility and efficiency of use :Accelerators -- unseen by the novice user -- may often speed up the interaction for the expert user such that the system can cater to both inexperienced and experienced users. Allow users to tailor frequent actions.
Aesthetic and minimalist design :Dialogues should not contain informationwhich is irrelevant or rarely needed.Every extra unit of information in adialogue competes with the relevant unitsof information and diminishes their relativevisibility.
Help users recognize, diagnose, andrecover fromerrors :Error messages should be expressed inplain language (no codes)precisely indicate the problem, andconstructively suggest a solution
Help and documentation:Even though it is better if the system canbe used without documentationIt may be necessary to provide help anddocumentation.Any such information should be easy tosearch, focused on the users task List concrete steps to be carried out, andnot be too large.