How Many Compensable Factors Should You Use? A Practical Guide

How Many Compensable Factors Should You Use?

Every point-factor plan starts with the same design question: how many compensable factors do you score each job on? Pick too few and every job lands in the same few score bands. Pick too many and your raters spend hours on distinctions that never change a grade.

There is no magic number, and the major published systems prove it. The Hay method scores on three factors. Mercer's IPE uses five. The U.S. federal government scores General Schedule jobs on nine. All three are defensible, because each fits the jobs and the audience it serves.

This guide shows you how the big systems differ, what changes as you add or remove factors, and five tests you can run to pick the right number for your own plan.

TL;DR

• Most workable plans use 3 to 9 factors. Four to six is the sweet spot for a mid-size employer.
• Fewer factors mean faster scoring but blunter results. More factors mean finer detail and more rater disagreement.
• Cover the four legal anchors of equal work: skill, effort, responsibility, and working conditions. Split them into sub-factors only where your jobs need it.
• Test your design on 10 to 15 benchmark jobs before you lock it. If a factor never changes a score, drop it.

What the major systems actually use

You do not have to invent a structure from scratch. Three well-known systems show the range.

Hay (Korn Ferry). The Hay Guide Chart-Profile method scores jobs on three factors: know-how, problem solving, and accountability. It is compact, and a trained consultant can score a job fast. Working conditions are handled outside the core chart. See our comparison of Hay vs Mercer IPE for how the two approaches differ.

Mercer IPE. Mercer's International Position Evaluation system uses five factors: impact, communication, innovation, knowledge, and risk. You can read Mercer's own description on its job evaluation (IPE) page. The extra factors let it separate jobs that Hay would score alike, such as a customer-facing role versus a back-office role with equal knowledge demands.

U.S. OPM Factor Evaluation System. Federal General Schedule positions are scored on nine factors, including knowledge required, supervisory controls, guidelines, complexity, scope and effect, personal contacts, purpose of contacts, physical demands, and work environment. The U.S. Office of Personnel Management documents the approach in its Classifier's Handbook. A government workforce with thousands of position types and a need for appeal-proof records justifies that level of detail.

Notice the pattern. Small factor sets favor speed and executive-level jobs. Large factor sets favor precision across wide job ranges and heavy documentation.

The legal anchor: skill, effort, responsibility, working conditions

If you operate in the United States, the Equal Pay Act gives you a baseline. It defines equal work by four elements: skill, effort, responsibility, and working conditions. The EEOC explains them in its Equal Pay Act guidance.

Your factor set does not have to be exactly four. But a plan that ignores one of these areas is harder to defend when someone challenges it. Hay and Mercer fold working conditions in differently, and federal plans give them their own factors. Whatever you choose, make sure you can point to where each of the four elements lives in your plan.

A common design is to start with these four as factor groups and split each into one to three sub-factors. That gets you to five to eight scored factors without losing the legal logic. Our guide to compensable factors covers the standard definitions.

What happens when you add or remove factors

Factor count changes four things at once.

Rater time. Each factor adds one scoring decision per job. Evaluating 150 jobs on 4 factors is 600 decisions. On 9 factors it is 1,350. If a rater needs two minutes per decision, that is the difference between 20 hours and 45 hours of scoring, before you add committee time.

Rater agreement. Every added factor is another place two raters can disagree. Plans with many overlapping factors, such as separate scales for "complexity," "problem solving," and "judgment," tend to score the same trait twice. That quietly inflates the weight of that trait.

Score spread. Few factors with few degrees produce clusters of tied scores, and ties make grade breaks arbitrary. More factors spread jobs out and give you cleaner grade boundaries.

Defensibility. A small plan is easier to explain to employees. A large plan is easier to defend against a claim that something important was ignored. You are balancing the two.

Five tests to pick your number

Run these tests in order. They usually land you between four and eight factors.

1. The coverage test

List the four legal anchors and the aspects of work your leaders say they pay for. Can you map every item to a factor? If a key value, such as safety risk in a manufacturing plant, has no home, add a factor or sub-factor.

2. The independence test

For each pair of factors, ask whether a job can score high on one and low on the other. If the answer is "never," they measure the same thing. Merge them. Knowledge and education are a classic overlap.

3. The discrimination test

Score 10 to 15 benchmark jobs, spanning your lowest and highest levels, on the draft factor set. Then drop each factor in turn and re-rank. If dropping a factor never changes the order, it adds work without adding information. Our article on selecting benchmark jobs explains how to choose the sample.

4. The rater test

Have three people score five jobs independently. If they disagree by more than one degree on a factor more than a third of the time, the factor is either poorly defined or too fine. Fix the wording first, using the advice in writing factor degree definitions. If that fails, merge it.

5. The size test

Match the plan to your organization.

Small employers should resist the urge to copy a federal-style plan. Our guide to job evaluation for small companies shows a lightweight setup.

A worked example: 6 factors, 1,000 points

Here is a balanced six-factor plan for a mid-size employer. The weights add up to 1,000 points.

Every legal anchor is covered, no two factors overlap heavily, and a rater can score a job in about 10 minutes. If you later find that healthcare or manufacturing jobs need more detail, add a sub-factor under effort or working conditions rather than rebuilding the plan. For help setting the percentages, see how to weight compensable factors.

Common mistakes

Copying a vendor's factor list without testing it. A system built for executive jobs may leave your hourly roles bunched together.

Adding a factor to please one department. If a single group lobbies for a factor, check whether it passes the discrimination test. Often it only raises that group's scores.

Scoring the same trait twice. "Decision-making" and "independence of action" often describe the same thing. Choose one.

Ignoring gender-neutral design. Plans that heavily weight physical effort and under-weight interpersonal and caregiving skills can undervalue female-dominated jobs. Review your factor set against our guide to gender-neutral job evaluation.

Want to see a factor set tested on your own jobs? Start free with PointFactors to see how a factor set scores your own roles.

Frequently asked questions

How many compensable factors is the minimum?

Three is the practical floor. The Hay method works on three factors, but it relies on trained evaluators and a detailed guide chart. If your raters are HR generalists, aim for at least four so the factors are easier to define.

Is there a maximum?

Nine is the highest count in a well-known published system (the federal FES). Beyond that, rater fatigue and double-counting usually outweigh the added precision.

Should every factor have the same number of degrees?

No. A factor like working conditions may need only four degrees, while knowledge may need six or seven. Match the number of degrees to how much real variation exists across your jobs.

Do more factors make the plan fairer?

Not by themselves. Fairness comes from clear definitions, balanced coverage, and consistent scoring. A well-built four-factor plan beats a sloppy nine-factor one.

Can I change the number of factors later?

Yes, but re-score every job when you do. Changing factors changes the scale, so old scores cannot be compared with new ones. Pilot with your benchmark jobs first and review the plan on a set cycle, as described in our article on job evaluation calibration.

How do sub-factors count?

Count the factors you actually score. If you score three sub-factors under "responsibility," your plan has three scored factors, even if you present them as one group.

Do I need the same factors as my market survey vendor?

No. Job evaluation ranks jobs inside your organization. Market pricing sets pay levels. You only need the two to connect through job matching.

Next steps

Start with the four legal anchors, draft four to eight factors, and run the five tests on 10 to 15 benchmark jobs. Lock the set only after the scores rank your jobs the way your leaders would expect, or you can explain why not.

If you want a head start, see our job evaluation plan design guide, then start free with PointFactors to build and test your factor set on your own jobs.

By Justin Hampton, founder and CEO of PointFactors.