Spider Charts: A Training Course

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# Spider Charts: A Training Course - PowerPoint PPT Presentation

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

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
• Used to evaluate multiple alternatives based on multiple criteria

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!

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

Developing Spider Charts

What a Finished Spider Chart Might Look Like:

• 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

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

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%)

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

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

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 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 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

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 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 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 Charting Exercise Solution

Here is what your Spider Chart should look like:

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

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