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.

Response format

7-point Likert (1=strongly disagree to 7=strongly agree); items averaged to a single score

Scale items

• I enjoy learning about [product category].
• I discuss [product category] with my friends and family.
• I spend time learning about [product category] because I find it genuinely interesting.
• In general, [product category] is an important part of my life.
• I read about [product category] or pay attention to information about it, even when I am not planning to buy.

Full scale items shown. Always cite the original source when using this scale in research.

Usage notes & scoring

Adapt items to target product category by replacing '[product category]'. Distinguish enduring involvement from situational involvement (Bloch & Richins, 1983) and purchase decision involvement (Mittal, 1989). Ceiling effects can attenuate predictive validity in high-involvement segments. For purchase decision contexts, complement with Mittal's (1989) PDI.

Recommended companion scales

Citation

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

Keywords