... These contributions are summarised in Table 1. Dynamic Skill Theory (Fischer, 1980;Fischer & Bidell, 2006), formal axioms of hierarchical complexity , the Lectical Scale and the Lectical Assessment System (Dawson, 2022b;Dawson-Tunik, 2006) Sound psychometric properties and hard stage requirements have been demonstrated in scores awarded at the scale of whole complexity levels e.g., Dawson et al. (2005) Whether similar properties are demonstrated in scores at a lower level of granularity than whole complexity levels Ego development theory (Cook-Greuter, 1999;Loevinger, 1976;Torbert, 2013), formal axioms of hierarchical complexity , and the ego development scoring system e.g., General measurement properties have been extensively evaluated including factor structures, and various types of reliability and validity e.g., Loevinger (1979) -Greuter, 1999), formal axioms of hierarchical complexity , and the ego development scoring system (Cook-Greuter, 1999) Ego development theory consistently espouses that its stages are hierarchically integrated and that ego development scores are a reflection of hierarchical complexity (amongst various other constructs) (Cook-Greuter, 1999;Fisher et al., 1987;Loevinger, 1976) Ego development theory (Cook-Greuter, 1999;Loevinger, 1976), formal axioms of hierarchical complexity , scoring exemplars from the ego development scoring system (Cook-Greuter, 1999;, the Lectical Assessment System (Dawson, 2022b;Dawson-Tunik, 2006) -Greuter, 1999;Loevinger, 1976;Torbert, 2013), formal axioms of hierarchical complexity , the ego development scoring system e.g., Leader complexity and related theoretical models e.g., Lord et al. (2011), the Lectical Scale (Dawson, 2022b;Dawson-Tunik, 2006), and the Computerised Lectical Assessment System (Dawson & Wilson, 2004) Some conceptual reasons and empirical evidence to suggest that leaders' reasoning skills may not satisfy the task demands of their roles e.g., Kegan (1994), Dawson and Stein (2004b) Whether the hierarchical complexity of leaders' reasoning skills satisfies the task demands of their roles at multiple management layers Dynamic skill theory (Fischer, 1980;Fischer & Bidell, 2006), Piagetian conceptions of disequilibration and reflective abstraction (Piaget, 2000), the Lectical Scale (Dawson, 2022b;Dawson-Tunik, 2006), and the Computerised Lectical Assessment System (Dawson & Wilson, 2004) Some evidence suggests that growth in hierarchical complexity occurs in the general adult population (Armon & Dawson, 2002;Commons & Davidson, 2015). Growth may occur in naturalistic settings and given exposure to specific types of interventions Stages of adult development may play a fundamental role in shaping the ways that reality is perceived (Cook-Greuter, 1999;Loevinger, 1976;Torbert, 2004) and the way that knowledge is constructed (Commons et al., 1998;Fischer & Bidell, 2006;Piaget, 1952). ...