1. Letting your supervision percentage fall behind early
This is the most expensive mistake on the list because of how the math works. Your supervision percentage is calculated cumulatively across your entire fieldwork experience, not month by month. That means every independent hour you log without corresponding supervision pushes the ratio down, and pulling it back up requires increasingly supervision-heavy months.
Here is what that looks like in practice. Say you are on a supervised fieldwork track (5% minimum) and you log 300 independent hours in your first three months with only 8 hours of supervision. Your supervision percentage is 2.6%. To get back to 5% by the time you hit 1,000 total hours, you now need 42 more supervision hours across your remaining 700 hours. That is 6% going forward just to recover from a slow start.
The fix is simple: front-load supervision. Having a comfortable buffer early gives you flexibility later when scheduling inevitably gets complicated. If your tracker does not show you this number in real time, you are flying blind.
2. Exceeding the monthly hour cap without realizing it
The BACB sets a maximum number of fieldwork hours per calendar month: 130 hours under pre-2027 standards, 160 hours under 2027 standards. Hours logged beyond that limit in a single month do not count toward your total. They are not carried forward. They are gone.
This hits concentrated fieldwork candidates the hardest. If you are working full-time clinical hours (40 hours/week), you are already at 160-170 hours in a typical month. Under pre-2027 rules, that means 30-40 hours of real work every month that simply do not count.
The painful part is that you did the work. You showed up, you performed the activities, and your supervisor was present. But the BACB does not care. If it is over the cap, it does not count.
Track your monthly total as you log. Not at the end of the month. Not when you compile your summary. Every time you enter hours.
ABA Fieldwork Tracker shows your monthly total in real time.
Every hour logged is checked against your cap instantly. You will always know how much room you have left before you hit the limit.
3. Ignoring the unrestricted ratio until it is too late
BCBA candidates need at least 60% of their total hours to be unrestricted activities. BCaBA candidates need 40%. This is cumulative across your entire fieldwork, and it is one of the sneakiest compliance rules because it compounds silently.
Early fieldwork often involves more restricted activities: observation, training, onboarding, administrative work. That is normal and expected. But if you are not tracking the ratio, you might finish your first six months at 45% unrestricted and assume you will make it up later.
The math does not work that way. If you have 600 hours at 45% unrestricted (270 unrestricted, 330 restricted), you need your remaining 1,400 hours to be 69% unrestricted just to hit the 60% threshold. That means dramatically shifting your activity mix for the rest of your fieldwork.
Check this number monthly. If it is trending below target, talk to your supervisor about shifting your caseload toward more direct client work, assessments, and treatment implementation.
4. Not tracking group supervision hours separately
Group supervision is capped at 50% of your total supervised hours. This applies across all pathways. Hours beyond that cap do not count as supervision.
The problem is that group supervision is often easier to schedule than individual sessions. Your supervisor runs a weekly group meeting, you attend, and you assume those hours are banking toward your supervision requirement. They are, but only up to a point.
If 60% of your supervision has been group-based, that extra 10% above the cap is not contributing to your supervision percentage. You effectively lost those hours without knowing it.
Track group and individual supervision as separate categories from day one. Know where you stand against the 50% cap at all times.
5. Missing supervision contacts in a single month (pre-2027)
Under pre-2027 standards, you need a minimum number of supervision contacts every month: 4 for supervised fieldwork, 6 for concentrated. Missing even one contact in a month means that month is non-compliant.
This is a binary rule. There is no "almost compliant." Four contacts or fail. And unlike other compliance metrics that are cumulative, this one resets every month. You cannot make up a missed January contact in February.
The good news: if you are following 2027 standards, supervision contacts have been eliminated entirely. The emphasis shifts to observation duration requirements instead. But if you are on pre-2027 standards, this is a monthly checkpoint you cannot afford to miss.
Build contacts into your regular schedule and track them as they happen, not at the end of the month from memory.
Not sure which rules apply to you?
ABA Fieldwork Tracker configures every compliance rule automatically based on your certification, standard, and fieldwork type. You pick your pathway, we handle the rest.
6. Leaving monthly summaries unsigned or incomplete
Your monthly fieldwork summary is not just a nice-to-have. It is a required document that both you and your supervisor must sign. When the BACB reviews your fieldwork, these summaries are primary evidence that your hours are legitimate and properly supervised.
The problem is that monthly summaries feel like paperwork, so people put them off. "I will get my supervisor to sign it next week." Next week becomes next month. Next month becomes three months. And then your supervisor changes jobs, or you switch sites, and getting retroactive signatures becomes a nightmare.
Finalize and sign every monthly summary before the next month begins. No exceptions. If your tracking system generates these automatically, even better. But generated or manual, the summary needs to be complete and signed on time.
7. Not tracking from day one
This is the mistake that enables all the others. If you do not start tracking properly from your very first fieldwork hour, you are building on a broken foundation.
"I will set up my tracking system after I get settled." "I will backlog my first few weeks once I figure out the categories." "My supervisor said we would sort it out together next month."
Every one of these is a recipe for problems. Retroactively categorizing hours from memory is unreliable. Backlogged entries lack the detail that real-time logging captures. And the longer you wait, the more hours you are reconstructing instead of documenting.
The candidates who have the smoothest fieldwork experiences are the ones who set up their tracking system before they log their first hour. They know their certification pathway, they understand which compliance rules apply, and they have a system that tracks everything from the start.
The common thread
Every mistake on this list shares the same root cause: information that was invisible until it was too late to fix cheaply. The supervision percentage that slipped. The monthly cap that was exceeded. The unrestricted ratio that drifted. The contact that was missed.
None of these are difficult problems if you catch them early. A supervision percentage that is 0.5% behind after one month is a scheduling adjustment. A supervision percentage that is 2% behind after twelve months is a crisis.
The difference between the two is not knowledge. It is visibility. If your tracking system shows you exactly where you stand across every compliance metric, in real time, every time you log an hour, these mistakes simply do not happen.
That is what ABA Fieldwork Tracker is built to do. Not just track your hours, but validate them against every rule for your specific pathway, in real time, so you never have to wonder if you are compliant. You just know.