The Formula

STC created a weighting formula by following the four steps outlined below.

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Step 1 - Factor Formula

Divide 100% between the factors of Skill, Effort, Responsibility and Working Conditions.

Chart # 1

Factor Formula (100% divided between 4 factors)

Factors	Percentages	Points
Skill
Effort
Responsibility
Working Conditions
Total Value for the System	100%	1000

Step 2 - Subfactor Formula

Break down this weighting formula further by dividing 100% between the 10 subfactors.

Chart # 2

Subfactor Formula (100% divided between 10 subfactors)

Factors and Subfactors

Percentages

Points

Skill
Knowledge
Interpersonal skills/Contacts
Problem-solving/Judgement

Effort
Mental Effort
Physical Effort

Responsibility
Personnel, Policies and Practices
Information Resources
Financial Resources
Material Resources

Working Conditions
Environment

Total value for the system

100%

1000

Step 3 - Levels Formula

Determine the points for each level by dividing the total number of points assigned to each subfactor by the number of levels. For example, the 120 points given to Mental Effort was divided by its number of levels (5). Each level was then assigned 24 points - 24 points x 5 = 120 points for level 5. The result of the calculation, from Level 1 to 5 is: 24, 48, 72, 96, and 120 points.

Chart # 3

Levels Formula (percentages divided between 4 to 6 levels)

Skill ( % divided between three subfactors)
Subfactors	Weight	Points	Points for Levels
			1	2	3	4	5	6
Knowledge
Interpersonal Skills/ Contacts
Problem-Solving/ Judgement

Effort ( % divided between two subfactors)
Subfactors	Weight	Points	Points for Levels
			1	2	3	4	5	6
Mental Effort
Physical Effort

Responsibility ( % divided between four subfactors)
Subfactors	Weight	Points	Points for Levels
			1	2	3	4	5	6
Personnel/ Policies/ Practices
Information Resources
Financial Resources
Material Resources

Working Conditions ( % applied to one subfactor)
Subfactors	Weight	Points	Points for Levels
			1	2	3	4	5	6
Environment

Step 4 - Expanded Formula

Remember that you can expand your formula so your job classes can fit more comfortably in some subfactors' levels in those instances when they would fall somewhere in between two levels. For example, if a job class fits best in Level 2 under the Interpersonal Skills/Contacts subfactor, but on occasion the person doing the job has to provide explanations on complex material, the job class may be scored properly at Level 2 +. You can expand your formula by using " + " and " - " shadings to achieve a more exact rating for these job classes.

Shading a formula with a " + " and " - " factor

To calculate points for the " + "or " - " factor, divide the number of points allotted to each level by 3, and add or subtract that amount.

Example:

If each level of the Communications skills subfactor had 25 points, divide 25 by 3. The " + " or " - " factor is 8.3 points. Add or subtract that amount from the appropriate level. You will need to round off your numbers.

You can use the chart below in enter your shadings calculations.

Chart # 4

Expanded Formula
Point Values with " + " and " - "Shadings

	KN	PS	IS	ME	PE	PPP	FR	IR	MR	ENV
1
1 +
2 -
2
2 +
3 -
3
3 +
4 -
4
4 +
5 -
5
5 +
6 -
6

KN	Knowledge
PS	Problem-Solving/Judgement
IS	Interpersonal Skills/Contacts
ME	Mental Effort
PE	Physical Effort
PPP	Responsibility for Personnel, Policies and Practices
FR	Responsibility for Financial Resources
IR	Responsibility for Information Resources
MR	Responsibility for Material Resources
ENV	Environment

Return to the Job Evaluation section

Now you've created a weighting formula, you can return to the case study to learn about gathering job information.

Last modified: April 7, 2008