Theory strengthens the methodological and interpretive stance of a research study and is most fruitful when theoretical understandings are shared within collaborative research teams. This paper describes an approach to engaging productively with a theory, specifically the theory of practice architectures. Such engagement enabled the use of the theory for data gathering and analysis within an Australian mixed-methods research study -- Exemplary Early Childhood Educators at Work. Within the study, the theory offered a substantive lens for exploring exemplary educator practices and the organisational arrangements within early childhood education (ECE) sites that made those practices possible. The 'unpacking' of the theory of practice architectures led to the development of a suite of resource materials. This paper acts as an invitation to interact with and think on a practice theory and provides insight into the positive transformation of educational practices for the benefit of individuals and society.