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Cause and Effect Diagram aka Fishbone or ishikawa

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Cause and Effect Diagram (aka 'Fishbone' or 'ishikawa' Why Fishbone? Helps insure a balanced list of ideas have been explored during brainstorming. ... – PowerPoint PPT presentation

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Title: Cause and Effect Diagram aka Fishbone or ishikawa


1
Cause and Effect Diagram (aka Fishbone or
ishikawa
2
Why Fishbone?
  • Helps insure a balanced list of ideas have been
    explored during brainstorming.
  • Sort and relate the factors affecting a process
    when little quantifiable data is available
  • Assists in determining root cause
  • Helps overcome the theme effect

3
Fishbone How?
  • Describe the problem of interest
  • Decide the major causes typically the 6 Ms
    Manpower, Machines, Materials, Methods,
    Measurements, Mother Nature (Environment)
  • Brainstorm more detailed causes Ask why 5 times
  • Discuss causes and decide which are most
    important
  • Drive those most important to root cause

4
Avoiding Group Think
5
Fishbone diagram example
Minitab
6
Use the 5 whys to determine root cause
  • Ask Why 5 times
  • The radio failed to transmit Why?
  • The TCXO was off frequency Why?
  • The crystal was not oscillating properly Why?
  • There was a crack in the epoxy holding the
    crystal to the mount Why?
  • The supplier was using an improper cure
    temperature for the epoxy. - Why?
  • Suppliers cure oven is out of calibration.

7
Force Field Analysis
  • Forces creative thinking on the issues of change
  • Builds organizational consensus concerning the
    fuel for and the barriers to change
  • Demonstrates to others that you have carefully
    considered your recommended course of action.

www.mindtools.com
8
Pareto Chart
9
Stakeholder Analysis
http//www.mindtools.com
10
Failure Modes, Effects, and Criticality Analysis
(FMECA)
  • Locating the high-leverage opportunities
  • Quantifying the potential risks

MIL-STD-1629
11
Learning Objectives
  • Understand the use of the FMEA
  • Learn the steps to develop the FMEA
  • Summarize the different types of FMEA/FMECA
  • Exercise to actually perform a FMEA

12
Aerospace FMECA Examples
  • Satellite instrument redundancy analysis
  • System level FMECA
  • Functional circuit FMECA
  • Piece part FMECA
  • Military equipment fault detection and isolation
    analysis
  • Process FMECA

13
What is a failure mode?
  • The way in which something can fail

14
What is a FMEA/FMECA?
15
Why perform a FMECA?
16
The FMECA Process
17
The FMECA Form
18
The FMECA Procedure
19
The FMECA Procedure (Cont.)
20
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21
Severity, Occurrence and Detection
22
Severity, Occurrence and Detection
  • Severity
  • 1 Not Severe 10 Very Severe
  • Occurrence
  • 1 Low Probability of occurrence 10 High Prob.
  • Detection
  • 1 Likely to detect 10 Not likely to detect

23
Risk Priority Calcuations
24
Excel Example
25
Homework 4 30 points
  • Use the FMEA Homework 4 Excel spread sheet
  • HWK 4 tab
  • Complete cells B18-I25 inclusive
  • Complete the rest of the row for the highest 2
    RPNs
  • Notes Brainstorm 2 potential failure modes, each
    of which has two causes. Each cause has 2
    controls.
  • May work with a partner
  • Reading 20.11-20.18

Due January 31
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