This study aims to develop and test a theory-linked taxonomy of behavior change techniques (BCTs) used in interventions. The authors define 26 BCTs and use a coding manual to independently judge the presence or absence of each technique in published intervention descriptions and manuals. The results show that interventions vary widely in the range and type of techniques employed, even when targeting the same behavior among similar participants. The average agreement for intervention manuals is 85%, and a comparison of BCTs identified in manuals and published articles reveals a technique correspondence rate of 74%. The findings demonstrate the feasibility of developing standardized definitions of BCTs and highlight the variability in reporting intervention content. Standardized descriptions of intervention content would facilitate the fidelity of intervention operationalization in replication studies and applications, promoting evidence-based practice.This study aims to develop and test a theory-linked taxonomy of behavior change techniques (BCTs) used in interventions. The authors define 26 BCTs and use a coding manual to independently judge the presence or absence of each technique in published intervention descriptions and manuals. The results show that interventions vary widely in the range and type of techniques employed, even when targeting the same behavior among similar participants. The average agreement for intervention manuals is 85%, and a comparison of BCTs identified in manuals and published articles reveals a technique correspondence rate of 74%. The findings demonstrate the feasibility of developing standardized definitions of BCTs and highlight the variability in reporting intervention content. Standardized descriptions of intervention content would facilitate the fidelity of intervention operationalization in replication studies and applications, promoting evidence-based practice.