Improving the reliability of a Maladaptive Behavior Scale

Area of Science:

• Psychometrics
• Behavioral assessment
• Rehabilitation psychology

Background:

• The Maladaptive Behavior Scale (MBS) was developed by modifying the AAMD Adaptive Behavior Scale (ABS) Part II.
• Operationalizing frequency terms like 'occasionally' and 'frequently' in the MBS presented challenges.
• Previous versions lacked precise numerical definitions for these temporal adverbs.

Purpose of the Study:

• To describe a methodology for operationalizing frequency terms on the Maladaptive Behavior Scale.
• To enhance the numerical definitions of 'occasionally' and 'frequently' for improved behavioral assessment.
• To increase the reliability and utility of the ABS Part II through methodological refinement.

Main Methods:

• Utilized modal ratings from staff at 28 rehabilitation agencies.
• Defined frequency terms ('occasionally', 'frequently') numerically on a revised scale.
• Compared interrater reliability and item-by-item agreement between the original and revised scales.

Main Results:

• The revised scale, with operationalized frequency terms, showed slightly greater interrater reliability.
• Item-by-item agreement was also marginally improved on the revised scale.
• Raters' comments supported the revised scale's enhanced clarity and utility.

Conclusions:

• The described methodology effectively operationalized frequency terms on the Maladaptive Behavior Scale.
• Numerical definitions of frequency terms can enhance the reliability and usefulness of adaptive behavior scales.
• Similar approaches may improve other sections of the Adaptive Behavior Scale, Part II.