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Prof. Dr. Jan Borchers Media Computing Group RWTH Aachen University
Summer Term 2020
https://hci.rwth-aachen.de/cthci
Research Approaches in HCI
Current Topics in Media Computing and HCI
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Three Approaches to HCI Research
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TestEmpirical science
LookEthnography
Make
Engineering & Design
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Prof. Jan Borchers: Current Topics in Media Computing and HCI 3
CHAPTER 10
Ethnography
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Prof. Jan Borchers: Current Topics in Media Computing and HCI
Experimental research
Study
Hypothesis
Data
Theory
Experimental Ethnography
Ethnographic research
Study
Data
Theory
4
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• Collect data with different methods, e.g.:
• Observation
• Interview
• Code data and find patterns in it
• Create theories that explain the data
• Try to attack the theories by gathering more data
• Leads to stronger theories
Ethnography
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Ethnographic research
Study
Data
Theory
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Data Collection• Methods: Observation, interview, participation, logging
• Format: Field notes, video, audio, log files
• Triangulation: use multiple data sources to support an interpretation that increases the confidence of your conclusion
• From different participants
• From different types of data, e.g., observations, interviews, logs
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Research Example: Vlogging in Dentist Training• Becvar and Hollan (UCSD), ACM GROUP ’07• Field site: Dental hygiene training program in San Diego, CA, USA• Goals• Gain understanding of teaching and learning practices, media and
representations• Implement & evaluate a design prototype based on those findings
• Method• Ethnographic study of current practice• Implementing and deploying prototype, then second ethnographic study
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Vlogging in Dentist Training: Understanding Current Practice• Method (2004, one year in the field)• Observation• Video recording• Contextual interview
• 18 students, 4 instructors participated• Sample finding: strategies used by clinical instructors• Molding: laying their hands over students’ hands as they work with instruments• Directing: verbally talking a student through a new procedure: “Do this”• Demonstration: using hand gestures to show correct/incorrect ways to handle
instruments
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Three Approaches to HCI Research
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Test Look MakeEmpirical science Ethnography Engineering & Design
✔ ✔
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Prof. Jan Borchers: Current Topics in Media Computing and HCI 10
CHAPTER 11
Engineering & Design
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Engineering & Design• Objective: solve a problem with a solution that works• Key attributes*:• Compelling target• Solve a concrete, compelling problem with demonstrated need• Solve a set of problems using a unifying set of principles• Explore how people will interact with computers in the future
• Technical challenge• Requires novel, non-trivial algorithms, or configuration of components
• Deployed when possible• System is deployed, intended benefits and unexpected outcomes documented
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Research Example: Skinput
• Harrison et al., Best paper CHI ’10
• Contributions & Benefits
• “Skinput is a technology that appropriates the human body for acoustic transmission, allowing the skin to be used as a finger input surface.”
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13
Link
Source
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Three Approaches to HCI Research
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Test Look MakeEmpirical science Ethnography Engineering & Design
✔ ✔ ✔
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The Messy Truth
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Observation
Related scientific theory Descriptive model
Real-world study
Predictive model
Long-term effect study
Commercial product
Prototype 1 Prototype 2
…
Prototype n
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CommandMaps• Contributions & Benefits:
• “Introduces CommandMap interfaces for mouse-based command invocation. Theoretically and empirically demonstrates that their defining properties — spatially stable command locations and a flat command hierarchy — improve user performance.”
[Scarr et al., CHI ’12]
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Prof. Dr. Jan Borchers Media Computing Group RWTH Aachen University
Summer Term 2020
https://hci.rwth-aachen.de/cthci
Experimental Research Part 1 & Writing a Protocol
Current Topics in Media Computing and HCI
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Operationalization• Research Question:
“Young participants will have significantly better memory than older participants”
• How could we study this?
• Variables?
• Operationalization?
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Operationalization
• Hypothesis:“Participants aged between 16 and 30 years will recall significantly more nouns from a list of twenty nouns than participants aged between 55 and 70.”
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Basic Elements of Experimental Study
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Confounding variables
A
Manipulate
Measure
Compare
Extraneous variables
B Scales: • Nominal• Categorical• Interval• Ratio
Validity: • Internal• External
• Hold constant• Matching• Random assignment
Controls
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Basic Elements of Experimental Studies• Manipulation: Changing the value of the independent variable to create
treatment conditions
• Measurement: Measure the value of the dependent variable in each treatment condition
• Comparison: The score of one treatment condition is compared with another. Consistent differences between treatments ⇒ evidence of causality
• Control: Other variables are controlled to be sure that they do not influence the two variables being examined
Prof. Jan Borchers: Current Topics in Media Computing and HCI 21 Definitions from Gravetter and Forzano
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Name: Topic22
CHAPTER 12
User Study Protocols
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User Study Protocol*• A document that explicitly states why and how a research project is being
conducted
• Purpose:
• Clearly state the research question and hypotheses
• Plan the research procedure in detail
• A guide for all involved personnel
• Monitor research progress
Prof. Jan Borchers: Current Topics in Media Computing and HCI 23 *(O'Brien and Wright, 2002) How to write a protocol
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Context & AimResearch context:
• What is the status quo?
• What are the problems/disadvantages to this?
• What is your plan to improve this?
Aim:
• Describe the purpose of this study to tackle the problems mentioned in the context.
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VariablesA clear list of your variables including a short description, all levels and scales
Independent Variables: Device Size: The size of the input surface.
• Levels:
• SMALL: 66 mm x 50 mm (4:3 aspect ratio, a covered iPod was used for this)
• LARGE: 196 mm x 147 mm (4:3 aspect ratio, iPad was used for this)
Dependent Variables: Targeting Error: Distance in mm from center of the first touch point to the target’s center (ratio scale).
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Hypotheses• Should clearly describe the relationship of your IV and your DV
• You can also group your IVs
• Be sure it's clear what variables you're talking about (IV & DV)
• not “the performance of A is better”
• Clearly state your expectations (not “there will be a difference”)
“Blender conditions will decrease success rate and increase number of failed attempts & targeting errors”
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Task SectionShould include all information a participant needs to know to do the task with confidence.
What’s the main set of operations the participant has to perform?
• Tap on the input device to hit a target on the screen.
What happens after an erroneous attempt?
• The target colors red, and the participant has four more trials to hit the target.
When do you collect data points?
• An error is measured when the first attempt was not successful.
Should the participants focus on speed or accuracy?
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Experiment ProcedureIncludes all information about what happens in the study as a full step-by-step list (as detailed as possible)
• Introducing the participant to the purpose of your study
• Explain what s/he has to do during the complete session (not only the task)
• Describe when they have to do the task, fill out questionnaires, can take breaks,…
• Are there any compensations, costs or risks?
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Participant SectionDescribe your target group:
• Demographics: Age, handedness, sex, …
This is also the place to note the required number of participants
• Often depends on IVs
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Experimental Design• Within- or between-subjects design?
• How do you care about order effects?
• Which variables are counterbalanced, randomized, intentional order?
• Summary of the collected data (sample calculation):(12 participants) × 3 INPUT CONDITION × 2 DEVICE SIZE × 3 BLOCK × 3 TARGET SIZE × 9 TARGET POSITION × 3 Repetitions = 17,496 total trials
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ApparatusDescribe the software and the hardware
• Computer specifications
• UI toolkit
• Network communication
• Placement of the hardware
• …
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Result Section
Briefly describe how you plan to analyze your data.
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References
Include all the references you used in the protocol (e.g., in your context section).
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Applications of the ProtocolIn the end the conductor can
• Quickly setup the study environment using the Apparatus section.
• Explain the participant the study procedure using the Procedure section.
• The conductor has a checklist for the procedure!
• Explain the participants their task using the Task/Variables sections.
• Quickly start first statistical analysis using the Result section.
• Give the protocol to other researchers to repeat the study.
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Name: Topic35
User Study Protocol Example
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Example Protocol: The Research Problem• Title - “Evaluating the performance of a new keyboard layout”
• Research problem - “We intend to find if our new keyboard layout performs faster and with less errors than the QWERTY keyboard. The new layout would lead to smaller form factors.”
• Context - “There have been many new layouts that appear to perform faster than QWERTY but lead to fatigue [X, Y, Z]”
• Aim (derived from context)
• Hypotheses - “There is no difference in typing speed between the new layout and QWERTY”
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Protocol Structure: The Research Method 1/2• Independent variables & dependent variables (levels, operational definition,
measurement scale and unit)
• Task - “The user will perform a composition task using statements from MacKenzie et al. (CHI 2003). The participant will do the following activities to complete the task…”
• Subjects/Participants (number, main characteristics, criteria to include or exclude them)
• Experimental design (within or between groups and how the conditions will be assigned)
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Protocol Structure: The Research Method 2/2• Experiment setup and/or apparatus (such as hardware or special features in the
testing space)
• Experiment procedure (what the experimenter will do to setup the testing space)
• Data analysis methods
• References
• Include images or sketches if informative
• Write this section in future tense
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Extranous Variables • Situational
• Control
• Participants
• Counterbalance
• Experimenter bias
• Clear procedure
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In-class Exercise: Reconstruct a Protocol• Watch paper video
• Look at the User Study section in the given paper
• Reconstruct the protocol
• Evaluate against the authors’ protocol
• How did the paper attempt to establish internal and external validity?
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SourceSource
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Protocol Evaluation Check List• Is the research question stated clearly?• Is there any alternative interpretation of the question?• Suppose you can accept the stated hypotheses, does it contribute to the understanding of
the research question?• Are variables defined clearly on the operational level?• Is there more than one possible interpretation for the variables?• Is the experimental design chosen carefully with consideration of the trade-offs?• Are the statistical methods specified?• Are the resources needed to conduct the experiment stated?• Is the duration of the experiment appropriate?• Ultimate question: If you had no idea about the experiment before, could you pick up this
protocol, set up, and conduct the experiment? (Replicability)
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Literature• Thorsten Karrer, Moritz Wittenhagen, Leonhard Lichtschlag, Florian Heller, and Jan Borchers. 2011. Pinstripe: eyes-free continuous input on interactive clothing.
In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI '11). ACM, New York, NY, USA, 1313-1322. DOI=10.1145/1978942.1979137 http://doi.acm.org/10.1145/1978942.1979137
• Barry Brown and Eric Laurier. 2012. The normal natural troubles of driving with GPS. In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI '12). ACM, New York, NY, USA, 1621-1630. DOI=10.1145/2207676.2208285 http://doi.acm.org/10.1145/2207676.2208285
• Moira Burke, Cameron Marlow, and Thomas Lento. 2010. Social network activity and social well-being. In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI '10). ACM, New York, NY, USA, 1909-1912. DOI=10.1145/1753326.1753613 http://doi.acm.org/10.1145/1753326.1753613
• Mathieu Nancel, Julie Wagner, Emmanuel Pietriga, Olivier Chapuis, and Wendy Mackay. 2011. Mid-air pan-and-zoom on wall-sized displays. In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI '11). ACM, New York, NY, USA, 177-186. DOI=10.1145/1978942.1978969 http://doi.acm.org/10.1145/1978942.1978969
• L. Amaya Becvar and James D. Hollan. 2007. Transparency and technology appropriation: social impacts of a video blogging system in dental hygiene clinical instruction. In Proceedings of the 2007 international ACM conference on Supporting group work (GROUP '07). ACM, New York, NY, USA, 311-320. DOI=10.1145/1316624.1316672 http://doi.acm.org/10.1145/1316624.1316672
• Chris Harrison, Desney Tan, and Dan Morris. 2010. Skinput: appropriating the body as an input surface. In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (CHI '10). ACM, New York, NY, USA, 453-462. DOI=10.1145/1753326.1753394 http://doi.acm.org/10.1145/1753326.1753394
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