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Introduction to HCI Monday April 6 th For today . . . Atomic Chef—”Titanic’s Wake,” Tom Kujala, Brian Lewis, and Emelie Hegarty I received a video Let’s talk about prototypes and scenarios Let’s look at performance based testing Be sure to sign up for prototype-presentation spots

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Introduction to hci l.jpg

Introduction to HCI

Monday April 6th


For today l.jpg
For today . . .

  • Atomic Chef—”Titanic’s Wake,” Tom Kujala, Brian Lewis, and Emelie Hegarty

  • I received a video

  • Let’s talk about prototypes and scenarios

  • Let’s look at performance based testing

  • Be sure to sign up for prototype-presentation spots


The atomic chef titanic s wake tom kujala brian lewis and emelie hegarty l.jpg

The Atomic Chef”Titanic’s Wake,” Tom Kujala, Brian Lewis, and EmelieHegarty


Slide4 l.jpg

I received a video. It’s funny, but a little rough.You have about 45 seconds to leave the room if you want.

http://www.youtube.com/watch?v=8AyVh1_vWYQ



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Let’s Look at Prototypes

(and rapid prototyping)


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Scenarios

One method of “discount usability evaluation”


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Types of Prototypes

Different Features

Horizontal prototype

Scenario

Functions

Full system

Vertical prototype


Scenarios the ultimate minimalist prototype l.jpg
Scenarios: The Ultimate Minimalist Prototype

  • Describe a single interaction session with no flexibility for user

  • Combine limitations of both horizontal and vertical prototypes


A scenario is an encapsulated description of l.jpg
A Scenario is an Encapsulated Description of:

  • An individual user

  • Using a specific set of computer facilities

  • To achieve a specific outcome

  • Under specified circumstances

  • Over a certain time interval


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Design choices

Thinking about ways to make your prototype work for your audience



If you found that your audience was made up of older people you might increase font size l.jpg
If you found that your audience was made up of older people, you might increase font size

Start

Record

Stop


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If you determined that your audience might need some help you might increase font size

Start

Record

Stop


If you determined that they might need some more help l.jpg
If you determined that they might need some more help you might increase font size

Start entering data

Record information in database

Stop entering data


If the audience was kids l.jpg
If the audience was kids you might increase font size

Go

Do it

Stop


Producing faster prototypes l.jpg
Producing Faster Prototypes you might increase font size

  • Place less emphasis on efficiency.

  • Accept less reliable or poorer quality code.

  • Use simplified algorithms.

  • Wizard of Oz study.

  • Use a different computer system than the final platform.

  • Use low-fidelity media

  • Use fake data and other content.

  • Use paper mock-ups.

  • Use an imaginary (verbal) prototype.


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Performance-Based Usability Testing you might increase font size

Users perform tasks;

we observe what they do


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Selecting Tasks to Test you might increase font size

  • Most frequently done tasks

  • Most important or critical tasks

  • Most complex tasks


Method l.jpg
Method you might increase font size

  • Tell users what you want them to do

  • Make sure they are familiar with the equipment and procedures

  • Make sure they know that they are not on trial and can leave at any time

  • Be unobtrusive

  • Record observations; debrief them at the end


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What Can Be Observed you might increase font size

  • Objective measures

  • Subjective measures


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Objective Measures you might increase font size

  • Success or failure

  • Time to complete

  • Number of errors made

  • Pages or Help screens referred to

  • Calls to a Help Desk


Subjective measures l.jpg
Subjective Measures you might increase font size

  • Apparent satisfaction

  • Confusion

  • Anger and frustration


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Talk-Aloud Protocols you might increase font size

Sometimes called “Think-Aloud Protocols”


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Method you might increase font size

  • People are asked to perform a task

  • While they are performing it, they say out loud what they are thinking

  • Test coordinator records what is said

  • After they are done, they may be asked additional questions


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Benefits you might increase font size

  • You can learn where and why people get confused

  • People may offer a solution within their thought process

  • You can get a lot of information


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Drawbacks you might increase font size

  • Not everyone is good at doing something and talking about it at the same time

  • People will not want to appear stupid

  • If it doesn’t work, it usually fails Big Time


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Developing Questionnaires you might increase font size

Post-test questionnaires

Surveys--on-line or in-person


Questionnaires l.jpg
Questionnaires you might increase font size

  • A chance to gather additional information

  • A chance to do follow-up questioning

  • An opportunity to waste time and appear foolish


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Some Guidelines you might increase font size

  • Don’t ask questions for which you already know the answer

  • Don’t ask questions that would be better asked by observation

  • Make sure questions are fairly stated (neutral)

  • Don’t ask for too much of people’s time


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Types of Questions you might increase font size

  • Multiple choice

  • Likert scale

  • Open-ended

    A mixture of types is usually good


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Multiple Choice you might increase font size

  • People select from a limited set of choices (yes/no, 0-2/3-5/more than 5)

  • Make sure choices are mutually exclusive and clear

  • Make sure questions are meaningful


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Likert Scale you might increase font size

  • On a scale of 1 to . . . .

  • Odd/even number of choices?

  • Balance around the mid-point

  • Meaningful labels for numbers


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Open-ended Questions you might increase font size

  • A chance to get additional information and opinions

  • Allow enough space for answers

  • Make sure your questions are clear and unambiguous


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? you might increase font size

Shall we try one


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A Performance-Based Test you might increase font size


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Preparing for the Test you might increase font size

  • Consider www.rpi.edu (and pages it links to)

  • Design a scenario to test the effectiveness and usability of the site (the choice of scenario is up to you—make it a good one)

  • Design an observation sheet of things you will observe

  • Design a debriefing questionnaire


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Conducting the Test you might increase font size

  • We’ll select several groups

  • Each, in turn, will conduct the test at the front of the room

  • We’ll all observe the test and learn from our observations


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Each Group Will . . . you might increase font size

  • Conduct the test

  • Hold a debriefing

  • Tell us what they observed

  • Share some preliminary thoughts on applying the results of the test


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Testing Time you might increase font size


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On Thursday . . . you might increase font size

We’ll talk about prototypes and hear from Sean McLoughlin and Brendan Cass about “Driven to Distraction?


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Go forth you might increase font size

and perform


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