Has ABA finally found its heart?

Purpose This study aims to examine the historical trajectory of Applied Behaviour Analysis (ABA) regarding social validity (the field’s “heart”) through the Tin Woodman metaphor, and to evaluate how recent integration of compassion and client assent addresses persistent stagnation in social validity practices. Design/methodology/approach A narrative analysis of ABA literature was undertaken. Key historical works (e.g. Wolf 1978; Goldiamond 1974/2002; Carr 1996) and recent studies (e.g. Hanley 2010; Penney et al. 2023; Linnehan et al. 2023) were reviewed to illustrate the shift from purely technocratic interventions to approaches emphasizing compassion, choice and client partnership. Findings ABA’s early focus on procedural efficacy led to neglect of social validity, which remained underreported (<25% of studies). Recent initiatives (elevating compassion as an eighth ABA dimension and operationalizing client assent) signal a paradigm shift: effective ABA now demands aligning interventions with client dignity and well-being. The analysis concludes that true effectiveness requires treating client assent and dignity as central criteria of success. Practical implications ABA practitioners are encouraged to adopt a compassionate “bedside manner” and actively measure client engagement and happiness to ensure interventions are both effective and respectful. Social implications By aligning behavioural interventions with the values and dignity of clients and communities, ABA addresses past criticisms and strengthens its acceptance among stakeholders and the autistic community. Originality/value This synthesis links ABA’s founding vision to its current “heart-driven” reconceptualization. It highlights that integrating ethical dimensions – compassion, assent and social validity – is not only a return to ABA’s original values but also vital for its scientific and social legitimacy.