Measuring usability workshop

Infragistics Propietary2
Measuring Usability

Hi I am Stefan
 Senior UX Architect at Infragistics
 UI controls for desktop, web and mobile
 Developer productivity tools
 Teach and talk about UX

UX has taught us a lot
 Are there any User Researchers in the room?
 How many of you have ever prototyped?
 Among these are there some who usually start prototyping early on?
 Are there any “exceptionals” who got feedback on their prototypes from real users, not
stakeholders of colleagues?
“UX is not order taking”
Kevin Richardson

Evaluation
 Model extraction

Evaluation
 Silent observation

Evaluation
 Think aloud

Evaluation
 Think aloud
 Constructive usage
 Retrospective testing

Evaluation
 Think aloud
 Constructive usage
 Retrospective testing
 Controlled experiments

CONTROLLED
EXPERIMENTS

Synthesizing a hypothesis
 Statement
 Short and specific
 Assuming some kind of relationship
 It should be testable
 Accept it or reject it
 Generalizes over a group of users
 Often uses passive voice

Synthesizing a hypothesis - examples
 If leaf color change is related to temperature, then exposing plants
to low temperature will result in changes of leaf color.
 Hyperactivity is unrelated to eating sugar.
 A person’s preference for a shirt is not related to its color.
 If I replace the battery in my car, then my car will get better gas mileage.
 Water levels affect the amount of lice suffered by rainbow trout.

Synthesizing a hypothesis
 In the field throughout the day
 Communicate with colleagues and management via various means
 Send status updates for various crops
 Repetitive reports take up quite some time
 Agriculture is error intolerant (direct impact on harvest and profit)
 Communicate with multiple people while at a certain stop

Null hypothesis
The accuracy of information and time to gather and send a status
report for the crops are independent of the means of communicating
the report, the crops outlined and the number of people that need to
be informed.

Null hypothesis
The accuracy of information and time to gather and send a status
report for the crops are independent of the means of communicating
the report, the crops outlined and the number of people that need to
be informed.
Independent variables
Controlled variables
Dependent variables
Measured variables

Experiment concept
 Task 1 …………………………………………………………………….
 Send the following status update “Draught has
affected oats in C012 field” via text to Manoj,
Deepak and Divya
 Send the following status update “Rice in B039
field is robust and healthy” to Rohit by calling him

Experiment concept
Means of communicating
Type of crops
Number of people
#Conditions = #Means of communicating * #People

Experiment concept
 Error rate
 Rate of corrections
 Task completion time
Accuracy of information
Time to send a status

Executing the study

Analyzing the data

Further learning
https://www.r-project.org/
http://randomization.com/
https://stats.idre.ucla.edu/other/mult-pkg/whatstat/
What statistical analysis to use cheat sheet
Randomization to avoid learning effects
R-project for running statistical analysis
https://stats.idre.ucla.edu/r/whatstat/what-statistical-
analysis-should-i-usestatistical-analyses-using-r/
https://stats.idre.ucla.edu/stata/whatstat/what-statistical-
analysis-should-i-usestatistical-analyses-using-stata/

Remote usability studies

Preparation
Create an
account under
indigodesigned
.com
Email sivanov@Infragistics.com
to get an invite to the shared
workspace with the prototype
Create your own usability
study by extending the
prototype and defining
your own tasks

Execution
https://indigodesigned.com/study/run/h1170y563x3r/

Participation

Remote usability studies

FEEDBACK
AND
QUESTIONS
sivanov@infragistics.com stefanivanovux

Measuring usability workshop

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