Direct, Indirect, Product, Continuous, and Discontinuous Measurement
Key Takeaways
- Direct measurement observes behavior as it occurs; indirect measurement depends on reports or summaries.
- Product measures can be valid when the permanent product is clearly linked to the response.
- Continuous measurement attempts to capture every response in the observation period.
- Discontinuous systems sample behavior and have known bias patterns.
Measurement Method Selection
Direct measures involve observing and recording behavior as it occurs. Indirect measures rely on interviews, rating scales, or summaries from others. Product measures record outcomes that remain after behavior, such as completed problems, broken items, or submitted assignments.
Method Decision Table
| Method | Best use | Main caution |
|---|---|---|
| Direct continuous | Discrete behavior needing precise decisions | Requires observer time and clear definitions |
| Product | Durable outcomes linked to behavior | Product may not prove who did the response |
| Indirect | Screening, history, broad context | Memory and bias can distort data |
| Discontinuous | Busy settings or ongoing behavior | Samples behavior instead of recording all of it |
Discontinuous Bias Aid
- Partial interval recording tends to overestimate occurrence.
- Whole interval recording tends to underestimate occurrence.
- Momentary time sampling can be efficient for ongoing states but may miss brief responses.
Use discontinuous measurement when continuous measurement is impractical, not because precision is unimportant. On the exam, choose the method that preserves validity while fitting the setting.
Exam Tie-In
Expect items to pair a practical constraint with a data-quality risk. The best answer usually does not choose the easiest measure by default. It chooses the least biased measure that the setting can implement with training, integrity checks, and enough sampling to represent the behavior.
A parent completes a weekly questionnaire estimating how often aggression occurred at home. What type of measurement is this?
A BCBA records the number of correctly completed math problems on worksheets collected at the end of class. Which label best fits this system?
A teacher wants a practical estimate of on-task behavior during 30 minutes of independent work while also teaching the class. Which system is usually most defensible?