Borderline Intellectual Functioning: A Scoping Review.

Milane et al. (2025) mapped every paper they could find on borderline intellectual functioning. They read 138 reports, notes, and trials.

The team sorted what the field studies most and what it ignores.

Most work looks at other mental health labels or basic IQ scores. Hardly anyone studies daily living skills or asks clients how they feel.

In short, we know little about real-world strengths and needs in people with IQ 70-85.

Orió-Aparicio et al. (2025) dove deeper into the same gap. Their fresh systematic review shows people with BIF do struggle with cooking, money, friends, and work. The two 2025 papers pair like puzzle pieces: one maps the hole, the other fills it.

Peltopuro et al. (2014) already warned the field was thin. Cristina et al. update that map and prove little has changed in ten years.

Ferrari (2009) argued that IQ cut-offs leave many without help. The new scoping data back his claim: studies still skip daily skills, so clinicians keep overlooking them.

If you assess only IQ, you will miss why a teen with an 80 IQ keeps losing jobs or friends. Add an adaptive scale such as the ABAS-3. Ask about self-care, safety, and social steps. The field’s blind spot can be your clinical edge.

Borderline intellectual functioning (BIF) describes cognitive limitations that sit above the intellectual-disability cutoff yet below the average range, commonly framed as an IQ of roughly 70 to 85, with real effects on daily functioning.

BIF has lost visibility in the DSM-5-TR and ICD-11, which relegate it to complementary categories of aspects requiring attention rather than recognizing it as a diagnosis in its own right.

That demotion, plus unclear diagnostic criteria, is exactly why the authors argue a deeper and clearer understanding of BIF is needed.

Following PRISMA-ScR, the review mapped 138 academic and grey-literature documents published since 2012 that studied BIF as a specific group.

Most research focused on comorbid psychiatric, emotional, and behavioural disorders and on cognitive aspects. Very few studies explicitly addressed adaptive functioning, even though its conceptual, social, and practical domains are crucial for diagnosis and support.

The authors call for a clearer definition of BIF and for future work to include the perspectives of people who live with it. In practice, assess and document all three adaptive domains rather than leaning on IQ alone.