The applicability of the Kaufman Assessment Battery for Children (K-ABC) with older adults (50+ years) with moderate, severe and profound intellectual impairment.
K-ABC splits thinking styles clearly in adults 50-plus with severe ID—use it to shape teaching now and to watch for later decline.
01Research in Context
What this study did
The team gave the Kaufman Assessment Battery for Children (K-ABC) to 61 adults aged 50-81 who had severe intellectual disability.
They wanted to see if the test’s two main thinking styles—sequential and simultaneous—still showed up clearly in this older group.
What they found
The same two-factor pattern held up. Even with severe ID, the adults’ scores split neatly into step-by-step tasks and big-picture tasks.
This means the K-ABC can map out how someone thinks, even at 80 years old, so you can plan teaching or support.
How this fits with other research
Ono (1996) did a similar check on the Aberrant Behavior Checklist in Japanese adults with ID and also got clean factors, showing good tools travel across cultures.
Konstantareas et al. (1999) found the Stanford-Binet IV stayed reliable in young adults with ID, backing the idea that major batteries hold up past child norms.
Baker et al. (2025) went further, tracking the Modified Cued Recall Test long-term in Down-syndrome adults. They showed scores drop as dementia starts, so pairing K-ABC baseline data with later memory tests can flag decline early.
Why it matters
If you serve adults 50-plus with severe ID, start with the K-ABC. It gives you a quick picture of who needs step-by-step prompts and who learns better with whole scenes. Store those profiles; when new behaviors pop up, re-test memory with tools like the mCRT to spot early loss. You’ll tailor supports today and catch decline tomorrow.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Run one K-ABC sub-test, note if the learner scores higher on sequential or simultaneous tasks, then match your prompt style to the stronger channel next session.
02At a glance
03Original abstract
To define the intellectual characteristics of a population of older people (50+ years) with severe intellectual impairment who were the focus of a wider demographic study, participants were assessed on the Kaufman Assessment Battery for Children (K-ABC). Test material was modified to make it age-appropriate and culturally suitable. Of the 122 people in the population [chronological age (CA) = 63.5 years; range 50-90 years], 61 were successfully tested on the K-ABC (CA = 60.9 years; range 51-81 years). Factor analysis closely replicated the factorial structure demonstrated for younger children. Separate Sequential and Simultaneous Mental Processing factors were identified, with subtests from the Achievement Scale loading on these factors and not constituting a separate factor. Application of hierarchical cluster analysis confirmed the factor structures. Inferences in relation to cognitive development from a Piagetian perspective are drawn, and the utility of information on mental processing for educational intervention with older persons with severe intellectual impairment is noted.
Journal of intellectual disability research : JIDR, 1995 · doi:10.1111/j.1365-2788.1995.tb00497.x