Evaluations, Studies, and Researchkti.tugraz.at/staff/eveas/courses/evalme/slides/707.031-EvalMe-01.pdf · • look for usability bugs ... • properly report methodology and results

Evaluations, Studies, and Research

707.031: Evaluation Methodology Winter 2014/15

Eduardo Veas

Research Projects @ KTI

• Connected world• build connected coffee machine• build sensing and intelligence into appliances

• Augmented Data• how can we augment the real world with data?• investigate different display devices• investigate different visual techniques

• Augmented Knowledge Spaces• Use space to organize and interact with technology• Use natural mobility to interact with augmentations2

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Why do we evaluate?

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Motivation

What are evaluations? Why do we need them?

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Why do we evaluate?

• to make a product more efficient• to know whether we are going in the right path• find out if people can do what they wanted to

do with the tool • to obtain new ideas• choose between options in the design• for comparing interfaces

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Continuous Evaluation

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Methods for D & D

Waterfall Model of Software Engineering

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ApplicationDescription

Requirement specification

System Design

Product

Initiation

Analysis

Design

Implementation

Design Build Test

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Design Build Test

Fab. errors

Design errors

Alice Agogino. NASA Jet Propulsion Lab

UCD: ISO9241-210

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Plan the Human Centered Design

process

Understand and specify the context

of use

Specify the user requiremets

Produce design solutions to meet user requirements

Evaluate the designs against requirements

Designed solution meets requirements

Iterate where appropriate

THEOC, the scientific method

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Theory Hypothesis Experiment Observation Conclusion

Creative Problem Solving [Korberg and Bagnall ’71]

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Creative Problem Solving[Korberg and Bagnall ’71]

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Accept Situation

Analyze

DefineIdeate

Select

Implement

Evaluate

Design Thinking

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Design Thinking Principles

• Heterogeneous teams

• Cooperative work

• Fail often and soon

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A Process of Iterative Design

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DesignPrototype

Evaluate

A Process of Iterative Design

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DesignPrototype

Evaluate

Continuous Evaluation

• Iterative methods expose several stages

• We evaluate at every stage

• Different evaluation methods for different purposes

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Why do we evaluate?

• to make a product more efficient• to know whether we are going in the right path• find out if people can do what they wanted to

do with the tool • to obtain new ideas• choose between options in the design• for comparing interfaces

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We evaluate to understand a process and design solutions. We evaluate to validate our designs.

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Use evaluation to create and critique

Evaluation Goals

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Never stop exploring

How do we evaluate?

• stage defines goals and methods for evaluation

• evaluation informs iteration or continuation to next stage

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Goals

• Find out about your users: • what do they do?• in which context?• how do they think about their task?

• Evaluation goals:• users and persona definition• task environment• scenarios

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Goals

• Select initial designs• use sketches, brainstorming exercises, paper

mockups• is the representation appropriate?

• Evaluation goals:• elicit reaction to design• validate/invalidate ideas• conceptual problems/ new ideas

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Goals

• Iterative refinement• evolve from low-> high fidelity prototypes• look for usability bugs

• Evaluation goals• elicit reaction to design• find missing features• find bugs• validate idea

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Goals

• Acceptance• did the product match the requirements• revisions: what needs to be changed• effects: changes in user workflow

• Evaluation goals• usability metrics• end user reactions• validation and bug list

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Where do we use this knowledge?

• Visualization

• Social Computing

• Human Computer Interaction

• Big Data analytics

• Virtual / Augmented Reality29

707.031: Evaluation Methodology

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a research methodology

707.031: Evaluation Methodology

This course is about learning from mistakes, knowing when to move to the next stage and when to go back to the drawing board.

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707.031: Evaluation Methodology

• Scheduled annually since this year. Depending on students.

• First time as block lecture (2-week course)

• This may be your only chance to take it

• If you find this course valuable, you have to score it, so other students will have the opportunity in the future. (Lehrveranstaltungsevaluierung)32

707.031: Evaluation Methodology

• is not an intro to HCI, InfoVis, Visual Analytics, Augmented Reality.

• is not an Advanced Statistics, (Web) Usability, Interface Design.

• is appropriate for students (PhD. and Msc.) and researchers investigating:• novel metaphors to interact with machines• user behaviour and how it is influenced by

technology 33

707.031: Evaluation Methodology WYG

What you get:• organize your research problem• collect data about the problem and solutions• compare different evaluation methods• understand when which evaluation is

appropriate• properly report methodology and results

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§

• D1: Model Human Processor• D2: Visual Processing• D3: Visual Processing 2• D4: Haptics ?• D5: Crowdsourced studies ?• D6: Descriptive and Correlational Research Methods• D7: Two-Sample Experimental Designs:• D8: Multi-Sample Experimental Designs• D9: Putting it all together• D10: Evaluation

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707.031: Evaluation Methodology Grading

• 30% participation (in class)• 40% evaluator • 30% participant

• (bonus 15% for each study you take part in)

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Project Topics

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• Glove Study• AR Study• Collection Study• Visualization Study

Source of Variability

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ensuring the vitality of species

The Human Homunculus

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The Human Homunculus

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The Human Homunculus

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Measuring performance

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Comparing Human Responses

• Humans can rarely repeat an action exactly even when trying hard

• People can differ a great deal from one another

• How can we compare responses from different adaptive systems?

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Model Human Processor

• Is there a way to approximate responses of people?

• Can we predict usability of interface designs?

• …without user involvement?

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Model Human Processor

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Source: Card et al 1983

Model Human Processor(2): Processors

• Processing typical value and window. • Window [a,b] defined by extremes• Typical value is not average. It conforms to studied

behavior

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Model Human Processor (4): Memory

• Decay: how long memory lasts

• Size: number of things

• Encoding: type of things

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• WM: percepts and active products of thinking in (7+/-2) chunks.

• WM Decay ~ 7s / 3chunks. Competition / discrimination

• LTM: Infinite mass of knowledge in connected chunks.

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Model Human Processor (4): Memory

BCSBMICRA

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Read aloud

CBSIBMRCA

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Read aloud

Model Human Processor: Read Aloud

• Tool • Pen • Window • Coat • Cow • Paper

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Model Human Processor: Read Aloud

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• Orange • Black • Pink • Red • Green • Blue

Model Human Processor (3): Perception

• encodes input in a physical representation

• stored in temp. visual / auditory memory

• new frames in PM activate frames in WM and possibly in LTM

• Unit percept: input faster than Tp combines 53

Model Human Processor (3): Cognition

• Recognize-act cycle

• Uncertainty increases cycle time

• Load decreases cycle time

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Model Human Processor (3): Motor

• controls movement of body,

• combining discrete micromovements (70ms)

• activates action patterns from thought.

• head-neck, arm-hand-finger

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Model Human Processor: cycle time

• A user sitting at the computer must press a button when a symbol appears. What is the time between stimulus and response?

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Model Human Processor: cycle time

• Red pill / blue pill. A user sitting at the computer must press a button when a blue symbol appears. What is the time between stimulus and response?

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Hicks Law: Decision Time

• Models cognitive capacity in choice-reaction experiements

• Time to make decision increases with uncertainty

• H = log2(n + 1), for n equiprobable

• H =

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∑=

+1

2 )1/1(logi

ii pp

Model Human Processor: Motor action

• At stimulus onset, participant has to move the mouse to target and click. How long does it take?

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S

D

Fitts Law

• Motion as a sequence of motion-correction.

• Each cycle covers remaining distance

• Time T for arm-hand system to reach target of size S at distance D: T = a + b * log2( D / S + 0.5 ) • where a: y-intercept, b: slope

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S

D

Model Human Processor: Summary

• Top down analysis of response

• Reasonable approximation of response and boundaries (Fastman, Middleman, Slowman)

• For each expected goal• analyze motor actions• analyze perceptual actions• analyze cognitive steps transferring from perception to action

• BUT• missing parts: motor- memory, other senses (haptic /

olfactory), interference model, reasoning model61

Take Home

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Summary

…by now you should know

• Why we evaluate.

• Roles of evaluation in product development

• Why we need statistics

• Why we need to know humans

• How to model human response63

Projects

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Title Text

AR displays and perception of ISO signs

• Interference in AR displays

• Recognize ISO sign

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Sensory augmentation

• Recognize semantic haptic patterns

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Interactive Topic Modelling

• Analyze bibliography

• Build collections of interesting objects

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Recommending Visualizations

• Choose visualization appropriate for data

• Rate effectiveness of visual display

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Visual PatternsBar chartAustria

Visual Component: x-AxisSupported types: string, date

Visual Component: y-AxisSupported types: number

Geo chartVisual Component: region-location

Supported types: location

Visual Component: region-color-intensity

Supported types: number...

key: country

type: string , location8.474.000

key: population

type: number

...

country: Austria

population: 8.474.000...

...

Element...

...

Data from HDS Preprocessed Data

IDENTIFIED DATATYPES

ElementRecommended Visualization

Types

Recommended Concrete Visualizations

Other Supported Visualization Types

Submit Rating User Feedback (Rating)

Research Projects @ KTI

• Connected world• build connected coffee machine• build sensing and intelligence into appliances

• Augmented Data• how can we augment the real world with data?• investigate different display devices• investigate different visual techniques

• Augmented Knowledge Spaces• Use space to organize and interact with technology• Use natural mobility to interact with augmentations69

Readings

• User Centric Design and Human Factors. http://link.springer.com/book/10.1007%2F978-1-4471-5134-0

• [Card, Newell, Moran] Model Human Processor. http://faculty.utpa.edu/fowler/csci6363/papers/Card-Moran-Newell_Model-Human-Processor_1986.pdf

• Being Human. Microsoft Researchhttp://research.microsoft.com/en-us/um/cambridge/projects/hci2020/

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