Walk into two ABA sessions and they can look like completely different therapies. In one, a child sits at a small table and a therapist presents picture cards one at a time. In the other, the child and therapist are rolling cars down a ramp on the floor, and you might not realize teaching is happening at all. The first is usually discrete trial training (DTT). The second is natural environment teaching (NET). Most good programs use both. This page shows what each looks like, when each tends to fit, and how to tell whether your child's program has the balance right.
What is discrete trial training (DTT)?
DTT breaks a skill into small pieces and teaches each one in short, repeated "trials." The National Clearinghouse on Autism Evidence and Practice (NCAEP) defines it as an instructional approach with "massed or repeated trials with each trial consisting of the teacher's instruction/presentation, the child's response, a carefully planned consequence, and a pause prior to presenting the next instruction." Its 2020 review counted 38 studies supporting DTT as an evidence-based practice.
What it looks like: The therapist puts three pictures on the table and says, "Touch dog." Your child touches the dog. The therapist says "Yes, dog," and hands over a few seconds with a favorite toy. A short pause, then the next trial, maybe "Touch cup." If your child needs help, the therapist gives a prompt (pointing, for example) and fades it over time.
Strengths: clear, many learning chances in a short time, easy to measure, useful for skills that rarely come up naturally or that need lots of practice, such as early listening skills, matching, or imitation.
Limits: skills learned at a table do not always carry over to real life without extra teaching. Sessions that are all table work can feel like hard work to a young child, and children may start to avoid them.
What is natural environment teaching (NET)?
NET teaches within play and everyday routines, following your child's interests. NCAEP's matching category, naturalistic intervention, is "a collection of techniques and strategies that are embedded in typical activities and/or routines in which the learner participates to naturally promote, support, and encourage target skills/behaviors." Its review counted 75 supporting studies.
Researchers have grouped many play-based, child-led programs under the name naturalistic developmental behavioral interventions (NDBIs). A 2015 paper by leaders in the field described them as programs that are "implemented in natural settings, involve shared control between child and therapist, utilize natural contingencies, and use a variety of behavioral strategies." In a large 2023 review in the BMJ (Project AIM), NDBIs showed effects on social communication that held up even when parent and teacher reports were set aside.
What it looks like: Your child loves bubbles. The therapist holds the wand and waits. Your child reaches; the therapist models "bubbles," and when your child says "bu" or signs, out come the bubbles. The reward is the activity itself. The same session might work on turn-taking with a ball, asking for "more" at snack, or following "put on shoes" at the door.
Strengths: motivation comes built in, skills are learned where they will be used, and sessions tend to feel like play.
Limits: fewer practice chances per minute for some skills, and the therapist must be skilled at creating teaching moments without taking over the play. Data collection takes more planning.
DTT vs NET side by side
| Discrete trial training (DTT) | Natural environment teaching (NET) | |
|---|---|---|
| Setting | Often a table or a quiet area | Floor, playground, kitchen, store, car |
| Who leads | Adult chooses the target and materials | Child's interest leads; adult shapes the moment |
| Pace | Many short trials in a row | Teaching chances spread through play and routines |
| Reinforcement | Planned reward after correct responses, often a preferred item or activity | The natural result: get the bubbles, the swing, the snack |
| Good for | Skills needing lots of repetition; early learning-to-learn skills; precise discrimination | Requesting, play, social interaction, using skills in real life |
| Main risk | Skills stuck at the table; sessions feel like a chore | Too few practice chances; goals drift without data |
| Evidence (NCAEP 2020) | Evidence-based practice, 38 studies | Evidence-based practice, 75 studies |
What does the same goal look like both ways?
Take one goal: your child will say or sign "help" when stuck. Here is how each approach might teach it (an illustration, not a prescription).
- DTT version: At the table, the therapist hands over a jar with a lid that is a little too tight, with a favorite snack inside. When your child struggles, the therapist models "help." Your child imitates, the lid comes off, and the trial repeats with other tricky containers several times in a few minutes.
- NET version: During play, the therapist "accidentally" puts the toy cars in a clear bin your child cannot open, or the bubble wand ends up on a high shelf. When your child reaches or gets frustrated, the therapist models "help" and helps right away when your child tries it.
Both teach the same skill. The DTT version gives lots of fast practice. The NET version teaches the skill in the moment your child actually needs it. Many BCBAs start with one and move to the other, and the end goal is the same: your child asks for help with you, at school and at the playground. The BACB's ethics code asks behavior analysts to design interventions that produce "outcomes likely to maintain under naturalistic conditions," which is another way of saying skills must work in real life.
Which one is right for my child?
It is rarely either-or. The question is the mix, and the mix should change as your child grows. Some patterns:
- Toddlers and preschoolers usually do well with mostly play-based teaching, with short structured bits where repetition really helps.
- A child who is just starting to imitate or match may need more structured practice early on, then move skills into play quickly.
- A child who avoids the table or shows distress during drills needs more NET, more choice and a slower pace.
- School-age children may benefit from short structured practice that resembles classroom work, alongside real-world teaching in the community.
- Teens often work on skills in the settings they will use them: ordering food, handling money, catching the bus.
Your child's BCBA should explain the reasons for the balance in the plan, and you should be part of that decision. If you are also weighing play-based developmental models, see ABA vs Floortime and ESDM.
How can I tell if my child's program has a good balance?
Use this checklist after watching a few sessions:
- My child usually goes to sessions willingly and seems engaged, not just compliant.
- Structured teaching, when used, is short and mixed with play and breaks.
- Rewards are things my child actually likes, and they are being faded over time toward natural rewards.
- Skills learned at the table are being practiced with different people, toys and places.
- I can see data for both kinds of teaching at progress reviews.
- I have been shown how to create teaching moments in our own routines (meals, bath, car rides).
- The plan has changed at least once in response to how my child is doing.
If several items are missing, raise them at your next parent training session. A good BCBA will welcome the conversation.
What will I see in a Hope Center session?
Our approach is play-based and assent-based. Tasks are presented in a fun, non-forceful way, and when a child is upset, staff use therapeutic calming rather than pushing through. Our centers are full of laughing and singing. Structured practice is used when it helps a particular skill, and it is built around what your child enjoys. BCBAs write each program, RBTs deliver it with weekly supervision, and you get weekly parent training so the same teaching happens at home.
For a broader look at sessions, read what modern ABA really looks like and how ABA builds social confidence through play. New to ABA? Start with our new families page, or call 561-337-8865 for a free consultation.