Structured Trials and Naturalistic Teaching

Behavior technicians teach skills in two broad ways. In discrete-trial teaching, the adult runs short, planned practice rounds, one at a time. In naturalistic teaching, the adult builds practice into activities the learner already cares about, such as play, art or getting ready to go outside. Both approaches can teach the same skill. They differ in how the practice is packaged. Discrete-trial teaching breaks practice into separate trials that the adult presents and repeats. Naturalistic teaching places planned opportunities inside an ongoing routine or activity, and the reward comes naturally from that activity.

You always follow the plan your supervisor wrote and trained you on. This lesson explains what the parts of that plan mean. It does not replace that training.

What You Will Be Able to Do

• List the parts of one discrete trial in order, including where a prompt goes under immediate and delayed prompting, and say why each part matters.
• Score a trial using the categories in your plan, such as independent correct, prompted correct, incorrect or no response.
• Explain what makes teaching naturalistic, and what makes it incidental teaching.
• Tell discrete-trial teaching from naturalistic teaching by how practice is structured and reinforced, not by who speaks first or where the learner sits.
• Summarize trial data without treating missing trials as zeros or comparing measures that count different opportunities.

Before you start: You only need to know that a reinforcer is something that follows a behavior and makes that behavior more likely in the future. All other terms are explained as they come up.

One Discrete Trial, Step by Step

A discrete trial is one short practice round with a clear start and a clear end. "Discrete" means separate. Each trial is its own unit, so you can count and score it. In discrete-trial teaching, trials are repeated several times in a row.

Here is the running example. A learner is practicing asking for a toy by name. The technician sits on a rug with the learner, holding a toy train and a toy boat.

1. Prepare. Before the trial, get the materials ready and know the plan. You should know the instruction, which prompt to use and when, what counts as correct and what reinforcer the learner currently wants. Check that the learner is ready in the way your plan describes, for example looking toward you or the materials.

2. Give a clear instruction or cue. This is the signal that tells the learner what to do. Here, the technician holds up both toys and asks, "Which one?" Keep it short, and keep it the same as the plan says.

3. Give the learner a chance to respond, using the plan's prompt timing. A prompt is extra help that makes a correct answer more likely. One example is saying "train" for the learner to copy. Where the prompt goes depends on the plan:

   • Immediate prompt: You give the prompt right after the cue, before the learner answers. Then the learner responds to the prompt. "Which one?" → "Train" → learner says "train."
   • Delayed prompt: After the cue, you wait the planned time so the learner can answer alone. Plans may call this a time-delay procedure. If the learner answers correctly during the wait, you give no prompt. If not, you give the prompt and then let the learner respond to it.

   The plan decides which timing to use and how long to wait. There is no single correct waiting time for every learner or program. Prompting before the planned wait is over takes away the learner's chance to answer independently.

4. Deliver the consequence right after the response. What you do next depends on the response. A correct response earns the reinforcer. Here, the learner gets to play with the train. An incorrect response or no response gets the error correction written in the plan. Plans differ. Some re-present the cue with a prompt, and some simply move on. Researchers have compared several error-correction methods, so do not swap in your own.

5. Record data. Mark the trial right away, while you still remember it accurately.

6. End the trial before starting the next one. Separate the trials the way your plan says, so each trial has a clear end. That clear boundary is what lets you count trials one by one.

Scoring the response

The example plan in this lesson gives every trial one of four scores:

• Independent correct: correct with no prompt.
• Prompted correct: correct after a prompt. This is real progress, but it is not yet independent.
• Incorrect: the learner gave a different response. For example, the learner said "boat" while reaching for the train.
• No response: nothing happened within the response window the plan allows.

Programs do not all use these exact categories. Some record correct, incorrect or no response, and separately note the type of prompt used, such as a model or a gesture. Use the categories your trained program specifies.

Prompt timing affects scoring. With delayed prompting, a correct answer during the wait is independent, and a correct answer after the prompt is prompted. With immediate prompting, every answer comes after a prompt, so a correct answer is scored as prompted.

The difference between independent and prompted correct matters. A learner who gets every trial right only after a prompt still depends on the prompt.

Checkpoint 1: Put a Trial in Order

A different learner is practicing touching the blue card when asked. The plan uses a delayed prompt: wait 3 seconds, then point to the correct card. (The 3 seconds comes from this example plan. It is not a rule.) The correct-answer reinforcer is a short turn with a spinning top.

These steps from one trial are scrambled:

• A. Mark the trial on the data sheet.
• B. Say, "Touch blue."
• C. The learner has not responded, so the technician points to the blue card.
• D. Lay out the blue and yellow cards and check which reinforcer the learner is choosing today.
• E. The learner touches blue. The technician gives praise and a turn with the top.
• F. Wait 3 seconds for the learner to answer alone.
• G. Clear the cards to end the trial, as the plan says, before the next one.

Answer three questions:

1. What is the correct order? For each step, explain why it belongs in that place and what would go wrong if it were skipped or moved.
2. How should this trial be scored?
3. If the plan used an immediate prompt instead, what would change?

Answer: D, B, F, C, E, A, G — scored prompted correct

1. D, B, F, C, E, A, G. Here is why each step sits where it does:

   • D (prepare) comes first. Without the right materials and a reinforcer the learner wants, the trial cannot teach what it should.
   • B (cue) tells the learner what to do.
   • F (wait) comes before C (prompt). The wait is the learner's chance to answer alone. Pointing first would remove that chance.
   • E (consequence) follows the response right away, so the reinforcer is clearly connected to touching blue.
   • A (record) happens before the details fade.
   • G (end the trial) separates this trial from the next one so each can be counted.

   If your explanation named the order but not the reason, check it against these points. For example, "F before C" is only fully correct if you can say that the wait gives the learner a chance to answer without help.

2. Prompted correct. The learner was correct, but only after the point.

3. The prompt (C) would come right after the cue (B), with no 3-second wait (F). The learner would then respond to the prompt. A correct answer would still be scored prompted correct, because that trial never offered a chance to answer without help.

A tempting mistake is to think the prompt always comes before the learner's chance to respond. That is only true for immediate prompting.

Naturalistic Teaching: Practice Inside a Real Activity

Naturalistic teaching means planned skill practice built into the learner's normal routines and activities. It follows what the learner is interested in, and it uses reinforcers that come naturally from the activity.

Here is the same skill, taught naturalistically. The learner is building a train track and clearly enjoying it. The plan says to keep extra trains in a clear bin within view. When the learner reaches toward the bin and looks at the technician, the technician waits briefly as the plan says. If the learner says "train," the technician hands them one. If not, the technician gives the planned prompt. The reinforcer is getting the train and continuing to play, which is exactly what the learner was trying to do.

This is not unplanned play. The target skill, the arrangement of the bin, the prompt and the data were all decided in advance. The difference is that the practice opportunity happens inside the activity instead of being cut out from it.

Incidental teaching is a kind of naturalistic teaching that begins with the learner's own initiation. The learner first makes a bid for interaction, such as reaching and looking at the adult, or asking. Only then does the adult wait for or prompt the target skill. In the example above, the learner's reach and look came first, and the technician treated that as the teaching moment.

Compare this with the adult holding up a train mid-play and asking, "What's this for?" That opportunity is still naturalistic, because it is part of the play and leads to more play. But the adult started it, so it is not incidental.

The distinguishing facts: how practice is packaged, not furniture

Discrete-trial teaching can happen on a rug. Naturalistic teaching can happen at a table during an art activity. Location does not decide which approach you are using.

Who speaks first does not decide it either. The adult starts each discrete trial, and the adult can also start a naturalistic opportunity, as in the "What's this for?" example. Instead, ask these questions:

• Is practice a series of separate trials that the adult presents and repeats, each with a clear start and end? That is discrete-trial teaching. The reinforcer might be praise, a token, a turn with a preferred toy, or a natural one, such as the item the learner just asked for. The reinforcer does not decide it. What decides it is the trial structure, and the reinforcer does not need to come from an ongoing activity.
• Is a planned opportunity placed inside an ongoing routine or activity, with a consequence that comes naturally from that activity? That is naturalistic teaching.
• Within naturalistic teaching, did the learner initiate first? If so, it is incidental teaching.

In both approaches, the reinforcer is the one your plan specifies.

Watch for one tempting mistake. In the rug example, the learner also got a train. Getting a toy does not make teaching naturalistic. That example was discrete-trial teaching because the request was one of a series of separate trials the adult set up and repeated. It was not part of an ongoing activity like building a track.

Boundaries that always apply

• Arrange motivation only in ways your plan allows. Never withhold food, water, comfort, bathroom access or other essentials to create a teaching opportunity.
• Treat the learner with dignity. If the learner shows signs of not wanting to take part, such as pulling away, crying or leaving the area, stop, follow the plan and tell your supervisor.
• Practicing in natural settings may support using the skill elsewhere, but it does not guarantee it. Use of the skill in new places, with new people or with new items still has to be checked with data.

Checkpoint 2: Which Approach Is This?

The target skill in each case is naming colors. Classify each case as discrete-trial teaching, naturalistic teaching started by the adult, or incidental teaching. Name the fact that decides it.

1. A learner is painting at an easel. The plan says the technician keeps the paint pots. Partway through the picture, the technician holds up the red pot and asks, "Which color next?" The learner says "red," gets the red paint and keeps painting.
2. On the playroom floor, the technician lays out color cards and says, "What color?" After each correct answer, the learner gets praise and a sticker. The technician clears the cards, pauses as planned, and presents the next card. This repeats ten times.
3. A learner is playing with play dough. They hand the technician a closed jar of blue dough and look at them. The technician waits as the plan says, then models "blue." The learner says "blue," and the technician opens the jar.

Answer: Naturalistic (adult-started), discrete-trial, incidental

1. Naturalistic teaching started by the adult. The question is part of the painting, and the reinforcer is the paint the learner needs to keep going. The adult asked first, so it is not incidental. Do not call it discrete-trial teaching just because the adult started it.
2. Discrete-trial teaching. The deciding fact is the structure: separate, repeated trials that the adult presents, each with a clear end. The sticker is the reinforcer this plan chose, but it is not what decides the answer. If the plan used a natural reinforcer instead, these would still be discrete trials. Being on the floor instead of at a table does not change this either.
3. Incidental teaching, which is also naturalistic. The learner initiated first by handing over the jar and looking at the technician. The teaching happened inside the play, and the reinforcer, an open jar of dough, came naturally from it.

Checkpoint 3: Score and Summarize

A discrete-trial program for "asks for the train by name" had 10 trials planned. The plan scores percentage independent correct out of trials actually run.

What is the percentage independent correct? What should trial 8 count as?

Answer: 5 of 9, about 56%

• Trials run: 10 planned minus 1 not run = 9.
• Independent correct: trials 1, 2, 6, 9 and 10 = 5.
• Calculation: 5 ÷ 9 = 0.555…, and 0.555 × 100 ≈ 56%.

Trial 8 is not a zero. No opportunity happened, so it is left out of the count. Writing 5 ÷ 10 = 50% would treat an absent trial as a failure.

Also notice the difference between this number and "correct including prompts." That would be 7 ÷ 9 ≈ 78%. It uses a different top number and answers a different question: "how often was the response correct with or without help?" The two figures are not interchangeable.

Checkpoint 4: Observation or Interpretation?

During 20 minutes of track play, the technician recorded six times the learner reached toward the train bin while looking at the technician. After four of those reaches, the learner said "train" without a prompt. Twice the technician gave the planned model prompt, and the learner then said "train." The session note says: "Learner was bored with trains by the end."

Answer three questions:

1. Which opportunities were incidental teaching?
2. Can "4 of 6 in 20 minutes" be compared directly with Checkpoint 3's result?
3. What is wrong with the session note?

Answer: Learner-started, label each measure, rewrite the note

1. All six were incidental. Each one began with the learner's own reach and look.
2. Not directly. Both numbers use the same calculation: independent correct ÷ opportunities × 100. Here, 4 ÷ 6 ≈ 67%. But the opportunities are defined differently. Here, they are learner initiations during one 20-minute play session. In Checkpoint 3, they are adult-presented trials in a separate session. Because the bottom numbers count different things, from different sessions and times, report each with its own label. Do not compare 67% to 56% as if one beat the other.
3. "Bored" is an interpretation, a guess about how the learner felt. Record what you saw instead. For example: "After the sixth request, the learner left the track and stood at the window for about 3 minutes." Then tell your supervisor if the plan asks for it.

What to Remember

• A discrete trial runs in this order: prepare, give the cue, give the learner a chance to respond using the plan's prompt timing, deliver the planned consequence right away, record data, then end the trial as the plan says. Each step has a job, such as giving the learner a chance to answer alone or keeping each trial countable.
• With an immediate prompt, the prompt comes right after the cue. With a delayed prompt, the learner gets the planned wait to answer alone first, and the prompt comes only if needed.
• Score trials using your plan's categories. This lesson used independent correct, prompted correct, incorrect and no response. Prompt timing and error correction come from the plan, not from a universal rule.
• Naturalistic teaching is planned practice inside meaningful activities, using natural reinforcers. Incidental teaching is naturalistic teaching that begins with the learner's initiation.
• Discrete-trial teaching and naturalistic teaching differ in how practice is packaged: separate, repeated adult-presented trials versus opportunities inside an ongoing activity, where the reinforcer comes from that activity. A discrete trial can also use a natural reinforcer; its trial structure is what defines it. The approaches do not differ in who speaks first or where the learner sits.
• Write down what you observe, not what you interpret. Leave missing trials out of the count instead of scoring them as zero. Label each measure by the opportunities it counts before comparing it to anything.

Sources

• Sam, A., & AFIRM Team (2025). Discrete Trial Training, Updated. UNC Frank Porter Graham Child Development Institute. https://afirm.fpg.unc.edu/wp-content/uploads/Discrete-Trial-Training-Brief-Packet-Sam-AFIRM-Team-Updated-2025-1.pdf
• Amsbary, J., & AFIRM Team (2025). Naturalistic Intervention, Updated. UNC Frank Porter Graham Child Development Institute. https://afirm.fpg.unc.edu/wp-content/uploads/Naturalistic-Intervention-Brief-Packet-Amsbary-AFIRM-Team-Updated-2025.pdf
• Schreibman, L., et al. (2015). Naturalistic Developmental Behavioral Interventions: Empirically Validated Treatments for Autism Spectrum Disorder. https://pmc.ncbi.nlm.nih.gov/articles/PMC4513196/
• Behavior Analyst Certification Board (2023, updated 09/2024). RBT Test Content Outline (3rd ed.).
• Behavior Analyst Certification Board (2021). RBT Ethics Code (2.0).

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This study resource is not affiliated with, sponsored by, or endorsed by the Behavior Analyst Certification Board (BACB). BACB, Registered Behavior Technician and RBT are registered trademarks of the Behavior Analyst Certification Board. Source citations do not imply endorsement by their authors or publishers.