user modelling id 405 human-computer interaction
DESCRIPTION
User Modelling ID 405 Human-Computer Interaction. Ascending and Descending By M. C. Escher 1960. Mental models and program/design models. U sers ’ mental model. Designers ’ program model. a mental model is what the user believes about the system at hand (belief, and not facts) - PowerPoint PPT PresentationTRANSCRIPT
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User ModellingID 405 Human-Computer Interaction
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Ascending and Descending By M. C. Escher 1960
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Mental models and program/design models
Users’ mental model
Designers’ program model
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What you are up against…
- a mental model is what the user believes about the system at hand (belief, and not facts)
- individual users each have their own mental model (different users, different models)
- mental models are in a flux (users are bound to update models with experience)
- users suffer model inertia*
- mental models are simple (if design model is nontrivial, it's probably not the user model)*
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Let’s see some examples…
- the word "Google" is usually the top query at other search engines, and words like "Yahoo" and "Bing" score high on Google
- Why do people search for a website if they already know its name? Why not just type, google.com into the URL field?
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Let’s see some examples…
Users don't just confuse search fields; many less tech-savvy users don't understand the differences between many other common features:
•Operating-system windows vs. browser windows•A window vs. an application•Icons vs. applications•Collapsible/expandable views•Single-clicks vs. double-clicks•Local vs. remote info•…
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Let’s see some examples…
- Netflix queue vs. shopping cart
- Picture embedding in a word processor vs. WYSWYG HTML editor
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Let’s see some examples…
- When people have to guess how a program is going to work, they tend to guess simple things, rather than complicated things
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Let’s see some examples…
- When people have to guess how a program is going to work, they tend to guess simple things, rather than complicated things
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Let’s see some examples…
- In Microsoft Windows the Alt+Tab key combination switches to the "next" window
- Most users would probably assume that it simply rotates among all available windows
- If you have window A, B, and C, with A active, Alt+Tab should take you to B. Alt+Tab again would take you to C
- Actually, what happens is that the second Alt+Tab takes you back to A. The only way to get to C is to hold down Alt and press Tab twice.
- It's a nice way to toggle between two applications, but almost nobody figures it out, because it's a slightly more complicated model than the rotate-among-available-windows model
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So what can we do?
In case of a mental model mismatch, you basically have two options:
-Make the system conform to users' mental models
-Improve users' mental models so that they more accurately reflect the system
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Personas
- Personas are archetypes that describe various goals and observed behaviour patterns among your potential users and customers
- A persona encapsulates and explains the most critical behavioural data in a way that designers and stakeholders can understand, remember and relate to
- Personas use storytelling to engage the social and emotional aspects of our brain, which helps us to visualise and empathise with the user in a vivid and direct manner
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Personas
Katie Bennet, digital camera userfrom Designing for the Digital Age: Creating Human-Centred Products and services by By Kim Goodwin (pp.230)
-Set of goals-Mental model-Environment-Skills-Frustrations-Likes & dislikes-Attitudes-Typical tasks-Behaviour patterns-…
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What personas are
- Personas are fictional characters but distilled from real data you gathered from actual users (data driven & not based on assumptions)
- They are based on what users do and why they do them (actions, goals, motivations & behaviours)
- Sound personas emerge from good data, rigorous analysis, and compelling human presentation
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What personas are NOT- Creative writing exercises with photos and
fictitious biographical details- Market segments- averages
Segment size and
value
Demographics
Skills attitudes
and behaviours
Mental models
and goals
Market segments
Personas
always have
May have
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What personas are NOT- Creative writing exercises with photos and
fictitious biographical details- Market segments- averages
Segment size and
value
Demographics
Skills attitudes
and behaviours
Mental models
and goals
Market segments
Personas
always have
May have
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Structure of a persona
1. Use a photo for your persona. A good photo is key to making the persona believable and convincing.
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Structure of a persona
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Structure of a persona
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Structure of a persona
4. Include basic demographic information. But only to the degree that helps a reader better understand who your persona is. Age, income, occupation, marital status can be informative.
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Structure of a persona
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Summary
- User research is primarily about empathy — getting designers and developers to have empathy for their users, and be able to deliver products and services that really appreciate the users’ needs and goals
- And personas are perhaps the best tool in the user-centered design toolbox for communicating empathy — they feel like real people with real concerns, and when crafted well, can transfer insights realized through research to other members of the project team
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Summary
- User research is primarily about empathy — getting designers and developers to have empathy for their users, and be able to deliver products and services that really appreciate the users’ needs and goals
- Personas are perhaps the best tool in the user-centered design toolbox for communicating empathy — they feel like real people with real concerns, and when crafted well, can transfer insights realized through research to other members of the project team