Same skill domain task interspersal keeps mixed trials within one area, such as known and new object labels. Different-domain interspersal might mix a new label with a maintained motor action. Neither format is universally better. Teams should compare task similarity, switching effort, materials, response forms, stimulus control, access, consequences, acquisition, maintenance, and client preference, then report which arrangement was actually tested.
Define same skill domain task interspersal
State which features make tasks similar: instruction wording, materials, response form, stimulus class, setting, or learning goal. Two tasks can share a domain while differing greatly in effort and access. Different-domain trials can still compete for the same response or equipment.
Check confusion and switching
Similar tasks may support relevant practice or create confusion among close stimuli. Dissimilar tasks may provide contrast or add switching demands. Observe errors, latency, help requests, transitions, and the person's view rather than inferring fit from labels.
Use the study cautiously
The object-label experiment compared similar and dissimilar maintenance tasks with a small sample and found no consistent acquisition difference in its first experiment. The provider survey found 68.1% reported mixing tasks from different domains, which describes practice rather than effectiveness.
Protect accessible responding
The receptive-language paper discusses similar and dissimilar interspersal while emphasizing unresolved research questions. ASHA supports continuous AAC access, and the Ethics Code requires individualized, evaluated services for covered analysts.
A practical example
Theo compares known and new picture labels in one condition and a known sorting task among new labels in another. New-label accuracy is 7/12 and 8/12, while transition time is 40 and 95 seconds. The team considers both learning and switching burden.
Questions families can use
What makes these tasks similar? Does similarity help or confuse? How much switching occurs? Are response forms and supports comparable? Which data show acquisition, maintenance, time, and preference?
Sources
- Behavior Analyst Certification Board, BCBA Test Content Outline, 6th edition
- Bottini and colleagues, Task Interspersal Implementation Practices With Individuals With Autism Spectrum Disorder
- Volkert and colleagues, An Exploratory Analysis of Task-Interspersal Procedures While Teaching Object Labels
- Grow and LeBlanc, Designing Receptive Language Programs
- Behavior Analyst Certification Board, Ethics Code for Behavior Analysts
- American Speech-Language-Hearing Association, Augmentative and Alternative Communication
Finni resources
