Schedules of Reinforcement in ABA Therapy Explained

The building blocks of Applied Behavior Analysis (ABA) are the environmental events surrounding an individual’s behavior. Antecedents, or the events that occur immediately before an individual’s response, and consequences, or the events that occur immediately after an individual’s response, set the stage for behavior to be modified.

A schedule of reinforcement is a set of rules that specify how often reinforcement is delivered as a consequence for a target behavior, allowing the timing and frequency of reinforcement to be individualized to fit a learner’s specific behavior program. 

In this article, we will focus specifically on the use of reinforcement as a consequence and how reinforcement schedules can be adjusted to fit the learner’s needs. We will cover a variety of practical ways to use schedules of reinforcement in ABA, as well as ways for caregivers and families to use reinforcement outside of a clinical setting.

What Is a Schedule of Reinforcement?

Before forming reinforcement into a schedule, you must first have a solid understanding of the basics of reinforcement. Reinforcement is widely considered the most essential method of behavior change and is usually the strongest procedure for modifying behavior. Two types of consequences affect the behaviors they follow: reinforcement and punishment. Reinforcement increases the future likelihood that a behavior will happen again, while punishment decreases it. Reinforcement and punishment can both be considered “positive” or “negative,” but not in the standard definitions of the words.

By positive or negative, ABA practitioners don’t mean “good” or “bad.” By positive, we mean a stimulus, some type of thing or event, is presented to an individual immediately following a response. You can also think of it as being added to the individual’s environment. Negative consequences occur when a stimulus is removed from the individual’s environment immediately following their behavior.

The stimulus that follows a behavior and increases the likelihood of it occurring in the future is called a reinforcer. You might provide positive reinforcement by praising a child for listening, and you might utilize negative reinforcement by allowing a student who completed extra credit to get out of a homework assignment. Reinforcement is contingent, or dependent, on an individual performing a particular behavior.

Cooper, Heron, and Heward (2019) define a schedule of reinforcement as “…a rule that describes a contingency of reinforcement, the environmental arrangements that determine conditions by which behaviors will produce reinforcement.” In other words, by changing the conditions of reinforcement, practitioners can adjust when and how often a reinforcer follows a behavior to have the most beneficial effect on a learner’s responding.

Schedules of Reinforcement: The Basics

Schedules of reinforcement are classified into two types: continuous and intermittent. Continuous reinforcement, or CRF, means that a reinforcer is delivered or removed every time an individual engages in a specific response. Intermittent reinforcement describes a wide variety of schedules in which a reinforcer is delivered or removed after some occurrences of a particular response.

In almost every situation, practitioners want to see that a learner continues to perform an acquired skill. When an individual is first acquiring a skill, they may require more frequent reinforcement. Once the skill has been acquired, the individual will likely need fewer and fewer instances of reinforcement to continue engaging in the skill.
Schedules of reinforcement range from denser to thinner. Continuous reinforcement is the densest schedule of reinforcement, as every single instance of behavior is reinforced.

Skills in maintenance will gradually shift to thinner schedules of intermittent reinforcement. This allows the skill to continue occurring under more natural schedules of reinforcement.

Types of Reinforcement Schedules

Continuous Reinforcement (CRF)

This class of reinforcement schedules consists of only one type: continuous reinforcement. A learner experiences reinforcement for every instance of a target response. For example, a student who answers a question in class receives a piece of candy each time their answer is correct. 

People outside of a clinical or educational setting rarely experience reinforcement every time they engage in a specific response. Continuous schedules of reinforcement are most appropriate for young learners and learners acquiring new skills. Experiencing reinforcement for every occurrence of a response allows the individual to more quickly understand the connection between their behavior and the consequence they receive.

As with all procedures in ABA, there are a few limitations of CRF schedules to acknowledge. Continuous schedules of reinforcement aren’t necessarily the most practical or the most representative of reinforcement in everyday life. CRF schedules require the practitioner (or teacher, caregiver, etc.) to catch every time the learner performs the target behavior. Outside of a clinical setting or 1:1 setting, this is extremely hard to maintain.

If the learner is receiving tangible, or physical, items as reinforcers, you must ensure you have access to enough of the items to provide reinforcement continuously. Learners may also experience satiation on a CRF schedule. Satiation occurs when an individual is no longer motivated by a reinforcer because they have experienced it too often.

Intermittent Reinforcement

A majority of the spectrum of reinforcement schedules consists of intermittent schedules. Intermittent schedules of reinforcement differ from continuous schedules in that only some occurrences of behavior are reinforced. A practitioner can direct which specific behaviors are reinforced by changing the schedule of reinforcement.

Intermittent reinforcement schedules have several benefits over continuous reinforcement schedules. For one, they are more akin to reinforcement in the natural environment than to CRF schedules. We engage in different types of behavior all the time, but rarely receive reinforcement for every single one! Intermittent reinforcement schedules allow practitioners to gradually fade support to better match an individual’s regular environment.

Intermittent schedules are also more resistant to extinction, meaning it’s harder to break the relationship between a response and its reinforcer. Because not every instance of behavior is reinforced, the learner continues to respond for longer than they would on a continuous schedule even after reinforcement stops. They are accustomed to not knowing exactly when reinforcement might be available, so they keep engaging in the response to see if reinforcement will arrive again.

Next, we’ll cover the various types of intermittent reinforcement schedules and their pros and cons. Practitioners can change whether schedules are fixed or variable and whether they are time-based or response-based.  

Ratio Schedules

1. Fixed Ratio (FR): Reinforcement is delivered after a specific number of responses. The number of responses does not change unless the schedule is modified.
   • Real-life example: In class, a teacher allows their students to select a prize from the treasure box after every 5 completed homework assignments. The accuracy of the homework doesn’t matter, just that the assignment is completed. This would be technically referred to as an FR 5 schedule.
   • Pros: FR schedules typically produce consistent performance leading up to reinforcement. They also lead to high rates of responding because the faster the learner responds, the faster they experience reinforcement.
   • Cons: FR schedules usually produce what Cooper, Heron, and Heward refer to as a postreinforcement pause. This means that once the learner experiences reinforcement, there is a pause in responding before the learner resumes the behavior.
2. Variable Ratio (VR): Reinforcement is delivered after an unpredictable number of responses. The practitioner sets the average number of responses for the schedule, but the learner can’t guess how many responses will be necessary before reinforcement occurs.
   • Real-life example: The most classic example of a variable ratio schedule is a slot machine in a casino. Players pull the lever but have no idea how many times they need to pull it before receiving a voucher to win. It could take seven lever pulls or 23 lever pulls. If the machine is set to deliver a winning voucher on an average of 15 responses, it is on a VR 15 schedule.
   • Pros: VR schedules produce high rates of responding because the learner doesn’t know how many responses they must engage in before their behavior is reinforced. The faster they respond, the faster they will experience reinforcement. Unlike fixed ratio schedules, VR schedules don’t usually cause a post-reinforcement pause. Responding on a VR schedule is usually more consistent than an FR schedule since there is no pause after reinforcement.
   • Cons: Outside of a clinical or therapeutic setting, where learner responding is constantly under scrutiny, VR schedules can incidentally produce compulsive behaviors. Think back to our real-life example of a VR schedule, the slot machine. Gambling behaviors are typically on VR schedules. The individual doesn’t know how many gambling responses are needed before they win, so they continue to bet (and lose) until they do win.

Interval Schedules

3. Fixed Interval (FI): Reinforcement is delivered for the first response after a set amount of time. The amount of time does not change unless the schedule is modified.
   • Real-life example: A salaried employee is paid weekly and receives the same amount of money in each paycheck regardless of hours actually worked (e.g, if they took a sick day or time off during the week). They cannot pick up their paycheck until Friday morning after 8 AM each week. If they try to pick up their check before Friday at 8 AM, nothing happens. The initial response to pick up their paycheck after Friday at 8 AM is reinforced. This could be referred to as an FI 7-day schedule.
   • Pros: Practitioners like FI schedules because they are easy to implement. You likely don’t need as many tangible reinforcers as a continuous schedule or fixed ratio schedule, and FI schedules don’t require the same level of observation as other schedules- you don’t really need to pay attention to responding until the interval is over.
   • Cons: Once individuals adjust to an FI schedule, there is usually a post-reinforcement pause in responding. The learner knows that reinforcement won’t be available for a certain period, and no level of responding will change that.
4. Variable Interval (VI): Reinforcement is delivered for the first response after a variable amount of time. The amount of time tends to be around an average.
   • Real-life example: In a classroom, a teacher allows the students to have independent study time. Every 8-10 minutes, the teacher walks around and sets a piece of candy on the desks of students who are on task and actively studying. This could be referred to as a VI 9-minute schedule.
   • Pros: Responding is typically consistent on a VI schedule. Since the learner doesn’t know precisely when reinforcement might be available, they continue responding just in case. VI schedules are also relatively easy to implement since you only reinforce the first instance of a behavior after the interval ends.
   • Cons: Variable interval schedules usually result in lower rates of responding than other schedules, since responses during the interval of time don’t directly produce reinforcement.

Choosing the Right Schedule in ABA Therapy

Given the various types of reinforcement schedules, how does a practitioner decide which to use? Like with anything in ABA, our primary focus should be reaching the goals of the individual we are working with. If we have done our due diligence at the start of working with the individual, we have already identified socially significant goals to pursue with them. These socially significant goals must be important to both the individuals and their families/caregivers, and should aim to help the client function more independently in their everyday life.

If an individual is in the process of acquiring a new skill, a practitioner may use a continuous reinforcement schedule to help the learner acquire it more quickly. As the learner independently demonstrates the skill, the practitioner will start to thin out the schedule. As we discussed earlier, maintaining a skill (or a lasting behavior change) requires continued reinforcement, but on a much thinner schedule than during skill acquisition. The ultimate goal is to thin the reinforcement schedule out to match what occurs in the learner’s natural environment.

The beauty of reinforcement is in the level of individualization it offers clinicians. A schedule can be customized to exactly fit what a learner needs at any point in time and then modified as the learner’s needs change. The particulars of a reinforcement schedule can be adjusted to the learner’s current motivation, skill level, and rate of progress. Need to see a client make more rapid progress? Employ a continuous schedule or a denser intermittent schedule. Need to start fading support? Start thinning out the level of reinforcement to a thinner, more intermittent schedule.

Practical Applications and Examples

From the perspective of a practicing clinician, applying schedules of reinforcement becomes second nature with enough experience. Here are a few practical tips for utilizing schedules in the therapeutic arena:

• Do you have a young learner working on language acquisition and communication? Communication is a skill that opens a plethora of other skills for learners- you want it to happen as soon as humanly possible! A continuous schedule of reinforcement, where every instance of communication is reinforced (whether that’s with accessing tangibles, receiving praise, etc.), will help a little learner start communicating before your very eyes. The last thing you want is for their initial attempts at communication to go unrecognized!
• Let’s say you have a teenage client who is working on daily living skills. Maybe they need to learn how to complete a dental hygiene routine on their own or clean up their room independently. These are essential skills that can lead to your client’s increased self-sufficiency, but not if they require constant rewards for completion. Once they have shown that they can perform the tasks independently (with no prompting or reminders), you can move to less and less frequent reinforcement so that the schedule matches what your client will experience naturally.
• Variable ratio schedules are great for skills that are more complex or difficult to learn. Consider a student learning a difficult math concept: their teacher can only feasibly praise them occasionally, as they are likely in a class with at least 20 other students. The student continues to work hard at acquiring the ability to accurately complete the math problems and answer the teacher’s questions, so that when the teacher does call on the student, they can access reinforcement.
• A word of warning is necessary for the use of fixed interval schedules. Since reinforcement is only available for the first response after a certain amount of time, it’s easy for the learner to figure out that they can “watch the clock,” if you will. This is not ideal for most clinical or therapeutic situations. It’s like a college student who has a scheduled quiz every Friday. They probably aren’t going to pick up a textbook until Thursday night- maybe even Friday morning.

Common Misconceptions

• Reinforcement schedules are not “one-size-fits-all.”
  
  Even though two individuals might be working on the same skill, the same schedule of reinforcement may not be effective for both individuals. Schedules of reinforcement should always be customized to fit the individuals they are being used with.

• Intermittent ≠ reinforcement
  
  Intermittent schedules do not mean that reinforcement is delivered haphazardly. There is still a set schedule and a plan for when and how often the individual experiences reinforcement.

• Reinforcement ≠ bribery
  
  One of the most common misunderstandings I have come across as a practitioner is that reinforcement is the same thing as bribery. It is paramount to remember that the term “reinforcement” describes a consequence of a response- something that follows a target behavior and makes it more likely that the behavior will occur in the future. It should ideally only follow an appropriate response. Bribery, on the other hand, happens when you try to get someone to stop engaging in an inappropriate response by offering something they like. For example: “If you stop crying, I will give you this candy bar!” Reinforcement is proactive; bribery is reactive.

Tips for Parents and Caregivers

Schedules of reinforcement are powerful, research-backed tools of behavioral science that allow clinicians to make significant changes in individuals’ lives. With that said, the participation of individuals’ families and caregivers is another one of the most important aspects of behavioral therapy.

The families and caregivers of recipients of ABA therapy need to participate in training and implementation of the recipient’s behavior plan. Consistency across home, school, and therapy environments will allow the individual to make progress much more quickly than they otherwise would.

There are plenty of ways caregivers can, and probably already do, use simple reinforcement schedules at home. These might include things like:

• A child receives an allowance based on the completion of a certain number of household chores (fixed ratio schedule).
• A young student earns a reward at the end of a school semester when they bring home a report card with good grades (fixed interval schedule).
• A mother cooking dinner periodically checks in with her son doing his homework and praises him if he is on task (variable interval schedule).

Sometimes, it may be difficult for caregivers to recognize that a child is receiving reinforcement too seldom or too frequently. It may be time to change a reinforcement schedule if any of the following seem to be true:

• The current schedule is too much for the family to maintain for any length of time
• A child is regularly performing a new skill without reminders
• New problem behaviors pop up. This might be a sign that the child is not receiving reinforcement frequently enough and is frustrated with the current schedule.

Conclusion

Schedules of reinforcement are a crucial component of effective behavior change in Applied Behavior Analysis. By determining when and how often reinforcement is delivered, practitioners can teach new skills, strengthen desired behaviors, and promote long-term maintenance of those behaviors. Understanding and properly implementing these schedules allows clinicians to gradually transition learners from structured teaching environments to more natural, real-world settings where reinforcement occurs much less predictably.

When used thoughtfully, schedules of reinforcement build strong, lasting skills that support greater independence and confidence in learners. They ensure that behaviors are not only acquired but also maintained over time, even as direct reinforcement fades.

For caregivers and families, recognizing how reinforcement schedules work can be a powerful tool for supporting progress outside of therapy sessions. Consistency across home, school, and community environments reinforces the learning that happens in therapy and helps individuals thrive across all areas of their lives.

Because each learner’s needs and motivations are unique, selecting and adjusting reinforcement schedules should always be guided by data and individualized planning. Consulting with a Board Certified Behavior Analyst (BCBA) or qualified ABA professional ensures that reinforcement schedules are implemented ethically, effectively, and with the learner’s best interests in mind.

References

Cooper, J. O., Heron, T. E., & Heward, W. L. (2019). Applied Behavior Analysis (3rd Edition). Hoboken, NJ: Pearson Education.

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