CHAPTER 5

Question 1

achieving goals within constraints

Answer 1

design

Question 2

the purpose of the design we are intending to produce

Answer 2

goals

Question 3

limitations on the design we are intending to produce

Answer 3

constrain

Question 4

choosing which goals or constraint can be relaxed so that others can be met

Answer 4

trade off

Question 5

the study and practice of usability on technology

Answer 5

Human Computer Technology

Question 6

normative enterprises, where the process of peer review tends to encourage conformity to core set of values and approaches.

Answer 6

Scientific disciplines

Question 7

provide designers with a series of tools and techniques for understanding social setting and organizing their observations to derive models for design.

Answer 7

Contextual Inquiry

Question 8

provides set method whereby designers can move out from laboratory settings to the real world as a basis for design inspiration.

Answer 8

CI

Question 9

Revolves around the features of an interactive system that allow novice users to understand how to use it at first and then how to attain a maximal level of performance .

to familiarize to a new system

Answer 9

Learnabilty

Question 10

It makes use past knowledge of interacting with a similar system to ease the new system interaction

ability to know which action can be executed.

Answer 10

Predictability

Question 11

the ability of the user to assess the effect of past operations on the current state

principle of honesty of user

Answer 11

Synthesizability

Question 12

make use of new users past experience with other applications

Answer 12

familiarity

Question 13

form of consistency

Users often try to extend their knowledge of specific interaction behaviour to situations that are similar but previously unknown.

Answer 13

Generalization

Question 14

It relates to the similarities in behaviour arising from alike situations or alike task objects.

Answer 14

Consistency

Question 15

refers to the diversity of ways which the user and the system exchange information

Answer 15

Flexibility

Question 16

one of the ways to achieve dialog initiative is User-premptive , The user is the one to initiate an action on the system.

Answer 16

Dialog Initiative

Question 17

ability to support more than one task of the user system dialog at a time.

Answer 17

Multithreading

Question 18

Allows simultaneous communication of information concerning seperate tasks.

Answer 18

Concurrent Multithreading

Question 19

Allows a temporal overlap between seperate task . but stipulates that at any given instant t;he communication is restricted to a single task.

Answer 19

Interleaved Multithreading

Question 20

ability to transfer the control for the task execution between system and user.

Answer 20

Task Migratability

Question 21

It requires that equivalent values can be substitute for each other

Answer 21

Substituvity

Question 22

It refers to the modifiability of the user interface by the user or the system

Answer 22

Cutomizability

Question 23

concerns itself with supporting the user in successfully accomplishing an action with the system

Answer 23

robustness

Question 24

it allows the users to evaluate internal state of the system by means of its perceivable representation at the interface.

Answer 24

Observability

Question 25

It allows the user to explore the current internal state of the system without modifying it.

Answer 25

browsability

Question 26

assists the user by passive recall, such as suggesting the user possible words based on his text input.

Answer 26

default

Question 27

allows the user to navigate through observable states.

Answer 27

reachability

Question 28

This principle deals with the duration of an observable state.

Answer 28

persistence

Question 29

It covers the extent to which a system services support all of the tasks the user wishes to perform and in way that the user understands them.

Answer 29

Task Performance

Question 30

It is the ability of a system to recover in case of an error. There are two directions in which recovery can occur, forward or backward

Answer 30

Recoverability

Question 31

error recovery accepts that an error has occurred in the current state and negotiation from that state towards the desired state.

Answer 31

Forward

Question 32

It deals with the time needed for the system to communicate with the user. In general, short durations and instantaneous response times are desirable.

Answer 32

Responsiveness-

Question 33

covers the invariance of the duration for identical or similar computational resources

Answer 33

Response time stability

Question 34

ensure that the system allows a user to perform task he needs and in an expecting way

Answer 34

Task conference

Question 35

covers whether a system can perform all tasks of interest

Answer 35

task completeness

Question 36

deals with the user ability to understand the tasks.

Answer 36

task adequacy

Question 37

bodies to ensure compliance by a large community of designers standards require sound underlying theory and slowly changing technology

Answer 37

national or international

Question 38

more common than software high authority and low level of detail.

Answer 38

hardware

Question 39

offers a framework for reflecting debating and conversing within this challenging area, as well as documenting value that different types of design implications might serve

Answer 39

taxonomy

Question 40

has points that need to be met for the success of a system, they are still suggestive and more guidelines

Answer 40

design rules

Question 41

for usability relies on maximizing benefit one good design by abstracting out the general properties which can direct purposeful design.

Answer 41

repeatable design for usabiltity