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Updated: May 6, 2026

Making Sense of Listening: The IMAP Test Battery
Published on: October 11, 2010
A brief Dutch language Impact Message Inventory-Circumplex (IMI-C Short) using non-parametric item response theory
Sandro M Sodano1, Terence J G Tracey, Anton Hafkenscheid
1a Counseling, School, and Educational Psychology , University at Buffalo-SUNY , Buffalo , NY , USA.
Objective:
Non-Parametric IRT methods were applied to 127 clinicians' ratings of their patients using the Dutch Impact Message Inventory-Circumplex (IMI-C) to develop the IMI-C Short.
Method:
Four items from each octant subscale of the IMI-C were selected to maximally differentiate individuals along the continuum of impact messages.
Results:
Using larger samples (patients: N = 700, 812; raters: N = 42, 85, respectively), IRT-based reliability was generally comparable between the brief and parent subscales. Classical Test Theory-based reliability was adequate for the brief subscales and they converged with their parent subscales. Since the IMI-C is purported to represent the circular arrangement of impact messages, the fits of the parent and abbreviated scales were assessed and found to be good and not differ significantly.
Conclusion:
The new IMI-C Short offers advantages over the full-length IMI-C.
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