Mini lecture notes, class 3 Course organization [3
Mini lecture notes, class 3 Course organization [3 min] got group members? (put group number on hwk) got the book?
Lego exercise [5+5] Reprise Kegworth [15min] How to read a book, 5.2.3 (PQ4R) [10min] So, preview preface, and preview conclusions soon Chapter 1  why study the user?
risk better design help you be a team member/user
ABCS not covered: emotions, esthetics when? How much do you have to study the user? Chapter 2  CHI, HCI, HF, cog. Ergonomics, systems, user-centered design
Course project reminder [20 min.] What causes a plane to crash? A laundry list is required, or, a swiss cheese loaf lined up A lot, in safety critical systems Kegworth Air Disaster Why?
Near Ritter, Baxter & Churchill A lovely example Often used Storyline Flight, jan 1989, Heathrow to Belfast, Midland 192 Experienced pilots, new plane (737) Part of one of the safest systems in the world
Upon take-off, no problems Shuddering, fire in an engine at ~10 min. Shut off #2 engine, RHS (the good one!) This is the pilot error Hardware and Mischance badly designed new engine, failure at 3 months, approx. t=300 h, should be t=500,000 h, not tested at altitude /unlucky choice of diversion airport
[BMI hub] Auto throttle problem poor mental model of plane [system] (turned off good engine, which disengaged autothrottle, solving the judder problem) lack of engine feedback [interface design] Vibration Dial 1
vibration dial harder to read [design] vibration dial not required to fly [regulation] dial and plane not trained with simulator technology updated but not announced Vibration Dial 2 vibration dial small [design] Without range
marking [design] During descent lots of interruptions pilots cant see the engines no protocol: no checking/confirmation visually from cabin Passengers could see fire but explained it away, perhaps also flight attendants
diffusion of social responsibilities Social distance between aircrew and pilots crash 900 m short 43+4 out of 118+8 die +1 in 2012 (PTSD) At crash Not documented: noise abatement hillocks
Afterwards If any 13or 3 missing, no loss of life What was the pilot error? Thus, systems require understanding people, technology, and systems and environment References Wikipedia on kegworth
BBC. (1991). Fatal error: Taking liberties [television series]. Youtube has videos as well How to read a book, 5.2.3 (PQ4R) So, preview preface, and preview conclusions soon 1.3 So, when to study the user?
Fundamental attribution error of design More usable $$ Safer Risk driven Not like you
Lives at risk Know enough given cost of knowing more (satisficing) The ABCS Anthropometrics Behavioral The senses Motivation
Cognition Social System The system (pre-HCI) The system and user (early HCI) The system and what we know about the user (U-CS)
Another way to organize the user The system (pre-HCI) The system and user (early HCI) The system and what we know about the user (U-CS) Chapter 2
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