user experience metrics

Question 1

what is the point of user experience metrics

Answer 1

allows you to improve and compare designs
can assess whether your product is better than the competition

Question 2

what do ux metrics measure

Answer 2

usability utility ux

Question 3

what are some criteria for usability

Answer 3

efficiency
effectiveness
satisfaction
learnability
memorability
errors

Question 4

learnability

Answer 4

how easy it is to complete goals during first time use

Question 5

memorability

Answer 5

how easy is it to continue using the system when you haven’t used it in a while

Question 6

effectiveness

Answer 6

how well and completely users can achieve their goals

Question 7

efficiency

Answer 7

the time and effort required to achieve goals

Question 8

satisfaction

Answer 8

how users feel about the experience

Question 9

errors

Answer 9

how many how sever and are they easily recoverable

Question 10

usability metrics

Answer 10

measurements taken relative to user performed tasks

Question 11

what are 4 usability metrics

Answer 11

success rate
time taken
error rate
user subjective satisfaction

Question 12

performance measures

Answer 12

task based and relies on clearly defined criteria

Question 13

learning curve

Answer 13

describes how performance of SKILLED BEHAVIOUR increases with practice

Question 14

4 basic metrics of performance measures

Answer 14

task success
errors
time on task
clicks/actions

Question 15

task success

Answer 15

measures effectiveness with a clear pass and fail criterea

Question 16

task success rate

Answer 16

% of users who succeed

Question 17

eg of pass fail criteria

Answer 17

giving up
moderator calls it
timeout
completed but wrong

Question 18

errors

Answer 18

event based can be counted
have to decide what counts as an error

Question 19

e.g. of something that could count as an error

Answer 19

wrong choice
key action not taken
data entry error

Question 20

error rate

Answer 20

average number of errors per task

Question 21

time on task

Answer 21

measures efficiency with a defined start and stop
has variations so should conduct multiple trials and get an average

Question 22

clicks/actions

Answer 22

measures efficiency via the effort needed to complete a task
can compare the number of actions taken vs the minimum actions required

Question 23

user reported measures

Answer 23

provide quantitative feedback via standardised questionnaires and rating scales

Question 24

post task questionnaires

Answer 24

rate experience after each task to compare tasks

Question 25

post test questionnaires

Answer 25

rate the experience after completing all tasks in the system in order to compare systems

Question 26

what is an example of a post task questionnaires

Answer 26

single ease question(seq); has a rating scale

Question 27

what is an example of a post test questionnaires

Answer 27

system usability scale(sus); 10 statements with a scale then combined to make a sus score out of 100

Question 28

levels of measurement

Answer 28

the relationship amongst attributes

Question 29

variable

Answer 29

anything measured in a study

Question 30

attribute

Answer 30

a possible value of a variable

Question 31

what are the 4 levels of measurement

Answer 31

nominal
ordinal
interval
ratio

Question 32

norminal

Answer 32

attributes have names but no relationships

Question 33

ordinal

Answer 33

attributes are ordered

Question 34

interval

Answer 34

distance between possible values is meaningful

Question 35

ratio

Answer 35

ratios are meaningful