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September 14, 2004
Mobile HCI 2004: user interfaces and navigation
mental models of a cellular phone menu, comparing older and younger users
suzanne bay
RWTH Aachen University
what are the reasons for older users having bigger difficulties using mobile phones?
mental models typically a hiearchical tree
parallels with spatial representations (e.g. a map/city)
3 types of information used to remember spacial knowledge:
landmarks
routes
survey knowledge
landmarks - equivalent to landing points in a menu - e.g. messaging
routes - equivalent to the decision points and interactions to get to a point in a menu
survey - aerial view of the space - e.g. knowledge of a hierarchical tree, 3 levels deep
users carried out 4 tasks based on a few standard phones
then card sorting to get users' representations of the menu trees
cognitive maps then analysed for three types of knowledge
all younger users created a hierarchy
a third of older users clustered groups into unrelated groups of three (as shown on screen)
older users had far less idea about levels of hierarchy (2 levels instead of three)
implications-
make spacial maps of the menu in the manuals (or in phone)
graphical hints on the phone's display
*****
using landmarks to support older people in navigation
Joy Goodman
University of Glasgow
navigation is an important mobile activity
key for maintaining independence and quality of life
often more difficult for older people
landmarks not used often in current navigation aids
aim is to develop a pedestrian navigation aid basing assitance around landmarks
[Yet Another PDA Application - academics haven't moved on from PDAs for apps, all projects so far use iPAQs]
uses photos to show next landmark and direction
also simplified local area map including buildings
older users prefer:
no drown down menus
male voice with a standard accent
text rather than icons on buttons
sans-serif
question-
how do you keep landmarks up to date? is there a time element that is important (navigation using landmarks that used to exist)?
*****
the use of landmarks in pedestrian navigation instructions and the effects of context
Tracy Ross
ESRI
Loughborough University
'valued LBS' project
develop and test new concepts in LBS
landmark enhanced instructions gave user's far more confidence than basic navigation instructions
also less errors
less reliance on quantitative distance
some manoeuvres ebniffitted more:
first manoeuvre
multiple choices of direction
pedestrianised areas
low (or no) visibility of street names
now looking at real value of LBS
framework for value
question -
any work on the different perceptions of landmarks?
not to individuals, but some work of different contexts (especially between car and pedestrian navigation)
*****
UbiBus: Ubiquitous Computing to help blind people in public transport
Paul Couderc
INRIA Rennes
[very nice demo video showing a complete public transport navigation system, useful to all - maps of destination, access to information about adverts at bus stop, info about how long for bus to come, and if the bus is the right one for you]
ubicomp to provide "spontaneous" services
explicit interactions reduced to a minimum level
service driven automatically by the events in the real world
programming structured around physical objects and their interactions
wireless P2P architecture, relying only on autonomous nodes
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