Purpose This paper aims to clarify the term “tacit knowledge” and suggests the “onion model” as a way to explore conceptually linked layers of tacit knowledge. The model allows the application of different methodologies to elicit tacit knowledge in each layer, the ability to infer tacit knowledge in other layers from tacit knowledge gained in another layer and the exploration of the dynamics of tacit knowledge among the various layers presented in the model. Conceptual and practical advantages compared to prior works on tacit knowledge are discussed. Design/methodology/approach The main theoretical and methodological dilemmas discussed in the literature regarding tacit knowledge are reviewed. The “onion model” presented in this paper suggests an approach and methodologies that address the issues raised in the literature. The different layers of the model are demonstrated by prior research studies. Findings The “onion model” discussed in this study points to various layers of tacit knowledge and the links among them, allowing a research-based approach, as well as various practices. Research limitations/implications This paper discusses different layers of tacit knowledge relying on previous works that have dealt with these layers independently. The model as a whole and the dynamics among the layers are yet to be empirically investigated. Practical implications The “onion model” provides a conceptual framework that can be used for research and diagnosis aimed at exploring tacit knowledge that can serve individual and organizational development. Originality/value The approach discussed in this paper addresses some major problems discussed in the literature on tacit knowledge.

Purpose The notion of tacit knowledge is mostly discussed with regard to experts’ knowledge (Sternberg et al., 1995). It is less discussed in the context of interpersonal interactions, which are very common in organizations and in certain occupations (e.g. negotiations and therapy). The limited reference to this aspect is due to the lack of appropriate methodologies. This study aims to deal with this lacuna; specifically, how to elicit tacit knowledge in professions based on interpersonal interactions. Design/methodology/approach A case study was chosen to demonstrate the use of symbolic interaction key concepts (Goffman, 1959) as a method to evoke tacit knowledge. The information was gathered from interviews conducted among 20 business negotiation experts. The “onion” model (Asher and Popper, 2019) was used as a tool to analyze various layers of tacit knowledge. Findings The suggested framework enabled the exploration and characterization of tacit knowledge in professions based on interpersonal interaction, which would not have otherwise emerged. Practical implications As interpersonal interaction is a complex and abstract occurrence, the authors propose a conceptual framework (symbolic interaction), which allows for the characterization of such occurrences and a tool (the “onion” model) that allows for the classification of the elicited tacit knowledge. Originality/value The study suggests an original framework, which enables the identification and analysis of tacit knowledge in a context that is very common in organizations but is, yet, partially explored – personal interactions. The use of the suggested framework can possibly bridge the gap between unconscious personal learning and knowledge that can be used at the organizational level.