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Design Rules
- Golden rules and
heuristics
- (Principles of
Usability)
- 1- Learnability: the ease with which new users can begin
effective interaction and achieve maximum
performance
- 1.1 Predictability : it is means that the user’s knowledge of the
interaction history is sufficient to determine the result of future
interaction.(can I ‘tell’ what will happen based on what I have gone
through in past)
- 1.2 Familiarity : how prior knowledge from real world applies to new
system , The appearance of the object stimulates a familiarity with its
behavior (like a button on door & form) , Guessability
- 1.3 Generalizability : Applying specific interaction knowledge to new
situations like MS word & excel etc , Can be seen as a form of consistency ,
applications should offer the Cut/Copy/Paste operations whenever
possible
- 1.4 Consistency : Likeness in input - output behaviour arising
from similar operation , The user relies on a consistent
interface
- 1.1 Predictability : it is means that the user’s knowledge of the
interaction history is sufficient to determine the result of future
interaction.(can I ‘tell’ what will happen based on what I have gone
through in past)
- 2- Flexibility: the variety of ways the
user and system exchange
information
- 2.1 Dialogue initiative : Who controls dialouge. freedom from system
imposed constraints on input dialogue , a system-driven interaction
hinders flexibility whereas a user-driven interaction favours it , user
should be able to Cancel, suspend or resume tasks at any point .
- 2.2 Multithreading : ability of system to support user
interaction for more than one task at a time
- 2.4 Substitutivity : allowing equivalent values of input and
output that be substituted for each other , Ex : Margin settings
provide measurement in inches & centimetres
- 2.5 Customizability : Interface can be modified to different
needs ex : Colours & layout change, provide choice of
methods; allow short-cuts; permit users to change features:
deferred design
- 2.3 Task migratability : Transfer responsibility for task
execution between user and system like spell-checking.
- 2.1 Dialogue initiative : Who controls dialouge. freedom from system
imposed constraints on input dialogue , a system-driven interaction
hinders flexibility whereas a user-driven interaction favours it , user
should be able to Cancel, suspend or resume tasks at any point .
- 3- Robustness: the level of support provided
to the user in determining successful
achievement and assessment of goal
- 3.1 Observability : ability of user to evaluate the internal
state of the system from its apparent representation
- 3.2 Recoverability : Support for Undoing errors , ability of user to
take corrective action once an error has been recognized , Error
messages should be concise, informative, Specific & constructive
- 3.4 Task conformance/Completeness : degree to
which system services support user's tasks , System
should perform all the tasks that user needs or
wants
- 3.3 Responsiveness : Measures the rate of
communication between the system and user , Response
time is generally defined as the duration of time needed
by the system to express state changes to the user, short
durations and immediate response times are desirable
- 3.1 Observability : ability of user to evaluate the internal
state of the system from its apparent representation
- 1- Learnability: the ease with which new users can begin
effective interaction and achieve maximum
performance
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