Our data on case creation demonstrated both validity and reliability issues concerning the generation of solutions to easy cases. We propose a methodology that addresses the challenge of capturing and representing evolving knowledge into a validation activity. . The primary emphasis of this activity is not on finding a reliable answer but on identifying and representing optimal reasoning processes leading to acceptable answers for each case. The study examines five medical experts' reasoning processes while they solve and teach three specific cases. Visual representations of their discourse and reasoning processes are co-constructed and consolidated. Findings indicate that variability can be explained by structuring cases around key processes.