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CoU: Context of Use Model for User Interface Design

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How have these issues been tackled ? User modeling (such as personas) ... Brown defined context as a location, the identities of people around the user, ... – PowerPoint PPT presentation

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Title: CoU: Context of Use Model for User Interface Design


1
CoU Context of Use Model for User Interface
Design
  • Rony Abi-Aad,
  • Daniel Sinnig,
  • T. Radhakrishnan,
  • Ahmed Seffah

HCSE Group, Concordia University
HCI International 2003, Greece
2
The need for context modeling
  • Ubiquity and pervasive computing
  • Mobile users (accessibility)
  • Resource variability (specialized devices)
  • Need for context-aware systems

3
Health Services
Insurance Agent
Pharmacist
Physician
patient medical profile
Surgeon
Dentist
Dental Surgeon
Patient
Optometrist
4
Electronic House
5
Military Defense
6
How have these issues been tackled ?
  • User modeling (such as personas)
  • Used technology and devices
  • Task, workflow modeling

INSUFFICIENT
7
Shopping in Montreal
French English
French English
French English
French
English
8
What is Context?
  • Shilit and Theimer defined context as a location,
    the identities of nearby people and objects.
  • Where you are
  • Who you are with
  • What equipment is nearby
  • Brown defined context as a location, the
    identities of people around the user, the time of
    day as well as time of year, season, temperature
  • Schmidt defined context as interrelated
    conditions in which something exists or occurs
  • Users social environment
  • Tasks being performed
  • Users physical environment (location,
    infrastructure, conditions)
  • Shilit and Theimer defined context as a location
    the identities of nearby people and objects.
  • Where you are
  • Who you are with
  • What equipment is nearby
  • Brown defined context as a location, the
    identities of people around the user, the time of
    day as well as time of year, season, temperature
  • Schmidt defined context as interrelated
    conditions in which something exists or occurs
  • Users social environment
  • Tasks being performed
  • Users physical environment (location,
    infrastructure, conditions)

9
Context a dynamic system
  • U(E)

U User (interacts with the system) E
Environment
E(U(E))
U(E(U(E)))
.
  • User is part of its Environment
  • Behavior, preferences and demands are affected

User Model
Environment Model
10
Context of Use
Task
11
User Modeling
  • Modeling what the user knows vs. modeling what
    the user likes
  • Short term modeling vs. long term modeling
  • Explicit vs. implicit modeling
  • Individual vs. canonical user modeling

12
Environment Modeling
  • Spatial environment
  • Location, Environmental conditions
  • Temporal environment
  • Time and Duration
  • Social environment
  • Cultural ethics, people around, organization

13
User Task Modeling
  • Hierarchical
  • Goals, Tasks, Subtasks, Relations
  • High level representation of users computational
    needs
  • Indicates services, quality, performance, objects
    required

14
Context Modeling at a glance
  • Define attributes for the user model, the
    environment model and the technology used
  • Domain dependent
  • Strategy for capturing values for attributes
  • Sensors, preference file, implicit/explicit
  • Define rules which describe how these attributes
    are inter/intra related
  • 4. Define rules which describe how the users
    behaviour with the system (user task model) is
    affected

15
Where and how to Use the Context Theory?
  • During requirements analysis
  • As guidelines for user interface design
  • During usability testing
  • During run-time for adaptive system and
    relatively long term contexts
  • Application to MUI - Mobile User Using Different
    Devices
  • Integration in HCI Patterns

16
Context Modeling and Patterns
A Pattern is a three-part rule, which expresses
a relation between a certain context, a problem,
and a solution Alexander 1979.
Solution
Context
Problem
(the minimal triangle)
17
Multiple User Interfaces
  • Multiple User Interfaces (MUI) These provide
    different views of the same information and
    coordinate the services available to users from
    different computing platforms
  • User interface plasticity Applied to HCI,
    plasticity is the capacity of an interactive
    systems to withstand variations of contexts of
    use while preserving usability properties.

Book Multiple User Interfaces
Multiple-Devices, Cross-Platform and
Context-Awareness by Seffah and
Javahery, Wiley, September 2003
18
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