This paper consists of two parts. In the first part, I will introduce a philosophical toolbox that I call ‘conceptual scaffolding,’ which helps to reflect holistically on phenomena and concepts. I situate this framework within the landscape of conceptual analysis and conceptual engineering, exemplified by the debate about the concept of disease. Within the framework of conceptual scaffolding, I develop the main idea of the paper, which is ‘the binocular model of plural medicine’, a holistic framework for analyzing medical concepts (...) and phenomena. In the second part, I demonstrate the use and value of the binocular model by analyzing, through the lenses of the model, the phenomenon of health wearable devices and their effects on the concept of diagnosis. (shrink)