Supervised or Concentrated ABA Fieldwork. The Hour Math.

The BACB recognizes two fieldwork types: Supervised Fieldwork and Concentrated Supervised Fieldwork. Supervised Fieldwork takes 2,000 hours; Concentrated takes 1,500 at a higher supervision percentage. Concentrated hours count for about 1.33 times as much, so the smaller total reaches the same finish line. Same credential, different speed, different supervision load.

If you’re still in your master’s program and just starting to log hours, this is the single most confusing part of the process, and it’s mostly arithmetic. Here’s the math, the trade-offs, and how to pick.

What is the difference between Supervised and Concentrated Fieldwork?

Both are supervised fieldwork. The difference is the supervision percentage and the hour total.

Supervised Fieldwork requires 2,000 hours with 5% supervision each month. Concentrated Supervised Fieldwork requires 1,500 hours but with a higher supervision percentage. Concentrated Supervised Fieldwork is supervised fieldwork with extra oversight, and it rewards you with a lower hour requirement. Per the BACB, both types lead to the identical BCBA exam and credential, and you can accrue hours under one or both.

The supervision percentage is where they split. Under the current (2022) rules, Supervised Fieldwork needs 5% monthly supervision and Concentrated needs 10%. Under the 2027 rules, Supervised Fieldwork stays at 5% and Concentrated drops to 7.5%.

How does the 1.33 multiplier work?

It gives concentrated hours extra weight toward your total.

Per the BACB, concentrated hours have approximately 1.33 times the value of regular supervised hours. That’s why the concentrated requirement is 1,500 hours instead of 2,000: at roughly 1.33 times the value, 1,500 concentrated hours reach the same target as 2,000 Supervised Fieldwork hours. You’re doing the same job either way. You just earn credit faster because your supervisor observes more of it.

The practical effect: a month of concentrated hours counts for more toward your total than the same number of regular supervised hours. A good tracker applies the weighting automatically so your progress reflects true equivalent hours, not raw clock time.

How many hours does each type require?

2,000 hours for Supervised Fieldwork, 1,500 for Concentrated. The rest of the rules are nearly identical.

Both types share the same guardrails. At least 60% of your overall supervised fieldwork must be unrestricted activities (assessment, program design, supervision, documentation), which caps restricted activities like direct therapy delivery at 40% across your total hours. Per the BACB, at least 50% of your supervision must be individual, one-on-one contact. You must accrue all hours within five years.

Which type gets you certified faster?

Concentrated, if you can get the supervision. By 500 hours.

At a full 160-hour month under the 2027 cap, 1,500 concentrated hours is roughly 10 months of accrual, versus about 13 for 2,000 Supervised Fieldwork hours. That’s a real head start. But the speed is only real if your supervisor can actually deliver the higher supervision percentage every single month. Miss the percentage and the month doesn’t count as concentrated, which is how candidates lose time instead of saving it.

The honest summary: concentrated is faster on paper and demands a more available, more engaged supervisor in practice.

Which fieldwork type is right for you?

Pick Concentrated if your supervisor is hands-on and present. Pick standard Supervised Fieldwork if supervision is harder to schedule.

Choose Concentrated when you have a supervisor who can reliably hit 7.5% to 10% monthly and observe you for the required minutes. You finish sooner, which matters if you’re trying to certify close to graduation.

Choose Supervised Fieldwork when your supervisor is stretched thin, you’re at a large caseload, or your access to one-on-one time is unpredictable around your class schedule. The lower 5% requirement is easier to hit consistently, and consistency is what actually gets months to count.

You can also mix both, as long as each month meets its own type’s rules. The key isn’t guessing at the end. Track the supervision percentage live so you know, in real time, whether a given month qualifies as concentrated. The Ripley Fieldwork Tracker applies the 1.33 weighting and flags supervision shortfalls per month, which is the part people get wrong on spreadsheets.

FAQ

Does 1,500 concentrated hours really equal 2,000? Effectively, yes. The BACB values concentrated hours at approximately 1.33 times regular supervised hours, so it sets the concentrated requirement at 1,500 hours to match the 2,000-hour Supervised Fieldwork total.

Is Concentrated Fieldwork harder? Not harder work, more supervision. You need a higher percentage of monthly oversight, which depends on your supervisor’s availability.

Can I switch between Supervised and Concentrated Fieldwork? Yes. The BACB evaluates each month on its own. A month counts as concentrated only if it meets the concentrated supervision percentage that month.

What are unrestricted hours? Activities beyond direct therapy: assessments, program development, supervision, and documentation. At least 60% of your overall fieldwork must be unrestricted.

Does the 1.33 multiplier change in 2027? No. The multiplier and the 2,000 versus 1,500 totals don’t change. Only the concentrated supervision percentage drops, from 10% to 7.5%.

Sources

• BACB: FAQs About Supervised Fieldwork Requirements
• BACB: Documenting Fieldwork, Helpful Answers to Your FAQs
• BACB: Guidance for Meeting the BCBA Requirements During the 2027 Transition