Tutorial 4: Case Study. “Set Phasers on Stun” SY DE 142 – June 7, 2004 Introduction to Human Systems Engineering Waterloo, Ontario, Canada. Outline. Case Study: “Set Phasers On Stun” Discussion on “Set Phasers on Stun” Midterm Overview. Set Phasers on Stun Overview. Time: 1986
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“Set Phasers on Stun”
SY DE 142 – June 7, 2004
Introduction to Human Systems Engineering
Waterloo, Ontario, Canada
a: mary beth's command
b: control signal
d: patient state
e: feedback on Therac state and actions
f: feedback on interface state and actions
(control signal sent)
g: interface information
Human = Mary Beth -
Interface = Therac Control Panel
Machine = Therac
World = Patient
SY DE 142 Midterm:
“Affordances become visible by establishing mappings, (what it does, how it works)”
Sequence of Actions(what should be done)
Gulf of evaluation!
Gulf of execution!
How is state of the world perceived? Use senses
1. Getting information input (input or cue biases)
2. Generating hypotheses and selection ( 6 biases).
3. Plan generation and action choice (4 biases).
user Interface machine World
begins with Action :
Operator acts on the interface.
Interface sends a control signal to the machine.
Machine acts on the world.
Feedback: (4 feedbacks)
State of world to interface
Action of machine to interface
Indication of control signal (machine to interface)
Information from interface to operator
Any missing item may cause an accidentInformation DisplaysHuman-Machine Model