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Spider Charts: A Training Course. Spider Charts Training Agenda. What Are Spider Charts? How Can Your Organization Use Them? Developing Spider Charts Spider Charting Exercise Summary References. What Are Spider Charts?. A graphical way to compare data Displayed in a “web-like” form

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spider charts training agenda
Spider Charts Training Agenda
  • What Are Spider Charts?
  • How Can Your Organization Use Them?
  • Developing Spider Charts
  • Spider Charting Exercise
  • Summary
  • References
what are spider charts

What Are Spider Charts?

  • A graphical way to compare data
  • Displayed in a “web-like” form
  • Used to evaluate multiple alternatives based on multiple criteria
slide4

How Can Your Organization Use Spider Charts?

  • Do you want to graphically compare multiple potential projects?
  • Do you need to analyze the strengths and weaknesses of different supply chain strategies?
  • Are you finding it difficult to make logical comparisons between business opportunities?

If your answer is yes, then Spider Charts may be your solution!

slide5

Developing Spider Charts (Six Easy Steps)

  • Identify the alternatives to be compared
  • Generate criteria to rate each alternative
  • Rate each alternative based on criteria
  • Draw and label the axis arms of the chart (one arm for each criterion)
  • Draw and label each alternative’s ratings on the chart, connecting between arms
  • Analyze the chart
slide6

Developing Spider Charts

What a Finished Spider Chart Might Look Like:

slide7

Developing Spider ChartsStep 1 – Identify the alternatives to be compared

  • Spider Charts could be used to compare:
    • Potential Projects
    • Performance of Vendors
    • Employee Performance
  • No more than 5 (five) alternatives should be compared using Spider Charts
slide8

Developing Spider ChartsStep 2 – Generate criteria to rate each alternative

  • Projects can be rated based on risk, return, initial cost, or any other criteria
  • At least three criteria must be used, more may be helpful, but more than seven may be too complex
slide9

Developing Spider ChartsStep 3 – Rate each alternative based on criteria

  • It is helpful to standardize ratings to some uniform scale (for example 0-10, or 0-100%)
slide10

Developing Spider ChartsStep 4 – Draw and label the axis arms of the chart (one arm for each criterion)

  • If there are five criteria (C) on a scale of 0-10:

C-1

10

C-2

C-5

5

0

C-3

C-4

slide11

Developing Spider ChartsStep 5 – Draw and label each alternative’s ratings on the chart, connecting between arms

  • Using different colors for each alternative is best

C-1

10

C-2

C-5

5

Alternative 1

Alternative 2

0

C-3

C-4

slide12

Developing Spider ChartsStep 6 – Analyze the chart

  • For this example, possible analyses might include:
  • Alternative 1 is better in criterion 1, 2 and 5
  • Alternative 2 is better in criterion 3 and 4
  • The largest difference is found in criterion 4

C-1

10

C-2

C-5

5

0

Alternative 1

Alternative 2

C-3

C-4

slide13

Spider Charting Exercise

  • Now, let’s go through an exercise to create a Spider Chart
  • Suppose you want to compare how well three different vendors have delivered goods on time over the past five years.
  • You have the following data:
slide14

Spider Charting Exercise (continued)

Data

On-time Delivery Percentages

Vendors: AppleGatePatriot, Inc.Franklin

Year: 1 45% 67% 83%

2 57 64 65

3 68 70 77

4 63 66 91

5 75 71 55

slide15

Spider Charting Exercise (continued)

  • Refer to the data on the previous slide and use the Six Steps to create a Spider Chart comparing the three vendors
  • Hint: The “criteria” used in this example are actually the five years
slide16

Spider Charting Exercise (continued)

As a reminder, here are the Six Steps:

  • Identify the alternatives to be compared
  • Generate criteria to rate each alternative
  • Rate each alternative based on criteria
  • Draw and label the axis arms of the chart (one arm for each criterion)
  • Draw and label each alternative’s ratings on the chart, connecting between arms
  • Analyze the chart
slide17

Spider Charting Exercise (continued)

More hints for the example problem:

  • The alternatives are the three vendors
  • The criteria are the five years
  • The ratings are given as the percentages
  • Your chart should have five arms (for the five years)
  • You should have drawn three “webs”, one for each vendor
  • What does the chart tell you about the vendors?
slide18

Spider Charting Exercise Solution

Here is what your Spider Chart should look like:

slide19

Spider Charting Exercise Solution

  • This Spider Chart was developed using Microsoft Excel, which is a quick and flexible way to make the chart
  • To make it in MS Excel, input the data in the cells, then “Insert” a “Chart” and select “Radar” as the Chart Type
slide20

Summary

  • Spider Charts are very useful for visually comparing a few alternatives
  • Just follow the Six Easy Steps to create your own Spider Chart
  • Microsoft Excel provides a quick and easy way to create a Spider Chart
slide21

References (Where to Find More Information)

  • http://www.internet4classrooms.com/excel_radar.htm
  • The Spider Chart: A Unique Tool for Performance Appraisal, 1995, ASQC, Rogers, Cephas B.
    • Go to www.asq.org (the American Society for Quality website) and search for “spider chart”
  • http://www.asq.org/education/docs/radarchart.pdf
  • Beyond Strategic Vision: Effective Corporate Action with Hoshin Planning, Michael Cowley, 199, page 76.
  • The Ultimate Six Sigma: Beyond Quality Excellence, Keki R Bhote, 2001, page 180.