Recently, the Staff-Client Interactive Behavior Inventory (SCIBI) was developed, measuring both interpersonal and intrapersonal staff behavior in response to challenging behavior in clients with ID. The aim of the two studies presented here was first to confirm the factor structure and internal consistency of the SCIBI and second to demonstrate its convergent validity. In the first study, a total of 265 support staff members, employed in residential and community services, completed the SCIBI for 62 clients with ID and challenging behavior. In the second study, 158 staff members completed the SCIBI for 158 clients, as well as the SASB-Intrex, the NIAS and the Bar-On Emotional Quotient Inventory (EQI). Replication of a confirmatory factor analysis resulted in a consistent seven-factor solution of the SCIBI with high levels of internal consistency. Also, mostly good convergent validity with the SASB-Intrex and sufficient to good convergent validity with the NIAS and EQI were found, except for the self-reflective intrapersonal staff behavior scale. By replicating and extending earlier results on the SCIBI, it proves to be a reliable and sufficient valid measure of interpersonal and intrapersonal behavior of staff working with people with intellectual disabilities. (Contains 5 tables.)