The PROBE Model: A Practical Framework for Teaching Diagnostic Reasoning in Clinical Settings

Diagnostic thinking is an essential skill for clinicians but is perhaps the most difficult one to teach well, especially for undifferentiated presentations. Clinical learners have a tendency to resort to plans of management or pattern recognition rather than deeply engaging with the process of diagnosis. To counteract this, I introduce a new educational approach-the PROBE model-which will engage learners with diagnostic thinking through a stepwise, structured process. The PROBE model is composed of five steps: Problem, Representation, Observation, Best Evidence and Explanation. It helps learners clarify the clinical issue, create a working summary, observe and interpret key information, integrate evidence and build an explanatory story. The new model derives its ideas from empirical clinical reasoning research, such as problem representation, structured information gathering, evidence usage and cognitive explanation. In contrast to current models, PROBE is tailored for real-world application within time-bounded clinical education environments. It can be applied flexibly across ward rounds, case discussions, simulated patient debriefings and in vivo supervisory meetings. The PROBE model is described theoretically within this Toolbox article, as well as providing guidance on its implementation for clinical teaching, with accompanying practice examples. Common challenges, as well as lessons gained from early implementation, are also noted. PROBE is designed as a conversation tool-to enable clinical teachers to direct learners from checklists to considered, rational diagnostic thinking. It provides a new approach to the theory-to-practice gap within the building of diagnostic expertise.