NordiCHI 2014 Tutorial: Medical device and HCI
Exercise 1
Dr. Karen Y Li
Future Interaction Technology Laboratory
Swansea University
Summative Evaluation
Formative Evaluation
Those we’ve known since 90’s
ž  Approaches
—  Perspective-based inspection
Those we’ve known since 90’s
ž  Approaches
—  Perspective-based inspection
—  Cognitive walkthrough
Those we’ve known since 90’s
ž  Approaches
—  Perspective-based inspection
—  Cognitive walkthrough
—  Heuristic evaluation
Heuristic evaluation
ž  A team
of evaluators
ž  An object and a set of tasks
ž  A set of heuristics/principles
http://cmsimg.indystar.com/apps/pbcsi.dll/bilde?Site=BG&Date=20090712&Category=LOCAL18&ArtNo=907120373&Ref=AR&MaxW=640&Border=0&q=80&Wishard-saysmust-build-new-hospital-shut-down
Exercise 1 – The Device
http://bit.do/pumpsim
Nielsen 1990
Simple and natural dialog
ž  Speak the user’s language
ž  Minimize user memory load
ž  Be consistent
ž  Provide feedback
ž  Provide clearly marked exits
ž  Provide shortcuts
ž  Good error messages
ž  Prevent errors
ž
Nielsen 1994
ž
ž
ž
ž
ž
ž
ž
ž
ž
ž
Visibility of system status
Match between system and the real world
User control and freedom
Consistency and standards
Error prevention
Recognition rather than recall
Flexibility and efficiency of use
Aesthetic and minimalist design
Help users recognize, diagnose, and recover
from errors
Help and documentation
Shneiderman 1998
ž  Strive
for consistency
ž  Enable frequent users to use shortcuts
ž  Offer informative feedback
ž  Design dialog to yield closure
ž  Offer simple error handling
ž  Permit easy reversal of actions
ž  Support internal locus of control
ž  Reduce short-term memory load
Weinschenk & Barker 2000
User control
Human limitations
ž  Modal integrity
ž  Accommodation
ž  Linguistic clarity
ž  Aesthetic integrity
ž  Simplicity
ž  Predictability
ž  Interpretation
ž  Accuracy
ž
ž
Technical clarity
Flexibility
ž  Fulfillment
ž  Cultural propriety
ž  Suitable tempo
ž  Consistency
ž  User support
ž  Precision
ž  Forgiveness
ž  Responsiveness
ž
ž
Exercise 1 – The Heuristics
ž  Visibility
of system status
ž  User control and freedom
ž  Consistency and standards
ž  Error prevention
ž  Accuracy
ž  Feedback
Exercise 1 – The Heuristics
ž  Visibility
of system status
—  Users should always be
informed about what is
going on.
http://th07.deviantart.net/fs70/PRE/i/2011/221/9/1/for_the_world_to_see_____by_keikei11-d2eyyjr.jpg
Exercise 1 – The Heuristics
ž  User
control and freedom
—  Users should be able to
leave the unwanted state
without having to go through
an extended dialogue.
—  Support undo and redo.
KEEP
CALM
AND
GET OUT
WHILE YOU CAN
Exercise 1 – The Heuristics
ž  Consistency
and standards
—  Users should not have to wonder whether
different words, situations, or actions mean
the same thing.
Exercise 1 – The Heuristics
ž  Error
prevention
—  Eliminate error-prone
conditions
—  Check for them and
present users with a
confirmation option
before they commit to
the action.
Exercise 1 – The Heuristics
ž  Accuracy
—  The result of user actions correspond to their
goals.
Exercise 1 – The Heuristics
ž  Feedback
—  For every operator action,
there should be some system
feedback.
○  Modest for frequent and
minor actions.
○  Substantial for infrequent and
major actions.
Alaris GP volumetric pump
Rate of
infusion
VTBI:
Volume To
Be Infused
Time
VTBI = Rate x Time
3 Tasks before 11.00
ž  Adjust
ž  Set
alarm volume to high
VTBI over time
—  VTBI 100mL, duration 30 minutes
ž  Set
Rate and VTBI
—  VTBI 1000mL, rate 125mL/hr
1 Tasks before 11.15
Share, Explain and Merge
1 Tasks before 11.30
Collect, Discuss and Compile