Ethical leadership measurement revisited: a conceptual and methodological deconstruction toward a future research agenda

Purpose This review offers a diagnostic and interpretive examination of ethical leadership measurement by integrating conceptual clarity, psychometric rigor and methodological innovation within a unified analytical framework. This study aims to address definitional overlap, validation inconsistency and cross-cultural limitations that continue to fragment theory and practice. Design/methodology/approach Using a structured conceptual narrative review guided by PRISMA procedures, the authors synthesize 106 peer-reviewed works published between 1960 and 2025. A tripartite framework − conceptual clarity, psychometric robustness and methodological rigor − was used as an interpretive heuristic to structure coding, comparative interpretation and diagnostic gap mapping across instruments and contexts. Findings Three persistent deficiencies are identified: conceptual ambiguity with transformational, authentic and servant leadership; psychometric fragmentation reflected in uneven dimensionality, partial invariance and limited multi-source validation; and methodological homogeneity dominated by cross-sectional, follower-reported surveys. The analysis advances a provisional integrative framework and diagnostic gap map, interpreting ethical leadership as a context-sensitive pattern of moral enactment rather than a fixed or universally invariant trait. Research limitations/implications English-language, peer-reviewed coverage may circumscribe indigenous or practice-based approaches. Practical implications Organizations should use behaviorally anchored, multi-source instruments, embed ethical metrics in performance systems and localize assessments to translate ethical rhetoric into measurable, sustained accountability. Originality/value Moving beyond descriptive syntheses, this review provides a heuristic framework that diagnoses recurring patterns and tensions in ethical leadership measurement. Four pathways are proposed for future theoretical and methodological development: conceptual boundary refinement; methodological diversification and design integration; cross-cultural and contextual adaptation; and meta-accumulative advancement.