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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: A Training Course

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Spider charts a training course

Spider Charts:A Training Course


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


Spider charts a training course

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!


Spider charts a training course

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


Spider charts a training course

Developing Spider Charts

What a Finished Spider Chart Might Look Like:


Spider charts a training course

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


Spider charts a training course

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


Spider charts a training course

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%)


Spider charts a training course

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


Spider charts a training course

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


Spider charts a training course

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


Spider charts a training course

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:


Spider charts a training course

Spider Charting Exercise (continued)

Data

On-time Delivery Percentages

Vendors: AppleGatePatriot, Inc.Franklin

Year:145%67%83%

2576465

3687077

4636691

5757155


Spider charts a training course

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


Spider charts a training course

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


Spider charts a training course

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?


Spider charts a training course

Spider Charting Exercise Solution

Here is what your Spider Chart should look like:


Spider charts a training course

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


Spider charts a training course

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


Spider charts a training course

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.


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