Enduring Involvement Index

What it measures

A brief, unidimensional measure of enduring consumer involvement with a product category — the ongoing, stable level of interest that persists independent of any particular purchase occasion. Bloch et al. (1986) introduced the enduring/situational distinction foundational in involvement theory, arguing that enduring involvement reflects a dispositional orientation driven by hedonic value and self-relevance. The EII captures habitual product class engagement through indicators of enjoyment, information seeking, discussion, learning, and personal importance. Validated in an automotive context but designed to be product-generic. Useful for distinguishing enthusiast segments (high enduring involvement) from occasion-driven consumers.

Representative items

• I enjoy learning about [product category].
• In general, [product category] is an important part of my life.
• I spend a lot of time thinking about [product category].

Citation

Bloch, P.H., Sherrell, D.L., & Ridgway, N.M. (1986). Consumer search: An extended framework. Journal of Consumer Research, 13(1), 119–126.