Criterion Referenced Interpretation of RPI Scores

Reported RPIs

Proficiency

Functionality

Development

Implications

100/90

Very Advanced

Very Advanced

Very Advanced

Extremely Easy

98/90 - 100/90

Advanced

Advanced

Advanced

Very Easy

95/90 - 98/90

Average to Advanced

Within Normal Limits to Advanced

Age-appropriate to Advanced

Easy

82/90 - 95/90

Average

Within Normal Limits

Age-appropriate

Manageable

67/90 - 82/90

Limited to Average

Mildly Impaired to Within Normal Limits

Mildly delayed to Age-appropriate

Difficult

24/90 - 67/90

Limited

Mildly Impaired

Mildly delayed

Very Difficult

3/90 - 24/90

Very Limited

Moderately Impaired

Moderately delayed

Extremely Difficulty

0/90 - 3/90

Negligible

Severely Impaired

Severely delayed

Impossible

Mather & Jaffe, 2002