Introduction to Work Design

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IE 327 Introduction to Work Design Dr. Andris
Freivalds Class 12
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Ch. 7 Design of Cognitive Work(Information
Theory)

• Bit binary unit amount of information
• from two choices (e.g. coin toss, hi/lo)

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• Bit binary unit amount of information
• from two choices (e.g. coin toss, hi/lo)

H log2 n log2 n 1.4427 ln n (n equally
likely alternatives)
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Information Theory (cont)

• H ?pi log2 (1/pi) (not equally likely)
• Redundancy reduction of information
• R (1 H/Hmax)x100
• Bandwidth channel capacity maximum
• amount of information processed

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Human Information Processing Model
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Perception and Signal Detection Model

• Explains
• Perception of information
• When noise present
• Four conditions
• Hit yes on signal
• Correct rejection (CR) no when no signal
• False alarm (FA) yes when no signal
• Miss no on signal

Resp-onse Signal Signal
Resp-onse Yes No
Yes Hit FA
No Miss CR
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Signal Detection Model
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SDT and Inspection

• Response criterion mental standard of judgment
  of signal
• Move left ? ? hits, but also ? FA (liberal)
• Move right ? ? FA, but also ? hits (conservative)
• d separation of signal and noise distributions
  increase if possible!!

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Ex. SDT and Accuweather
Fore-cast True Weather True Weather
Fore-cast Rain No rain
Rain 15 8
No rain 2 10
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Ex. SDT and JoBlo
Fore-cast True Weather True Weather
Fore-cast Rain No rain
Rain 9 6
No rain 9 11