Dealing with troubleshooting in FEA is a particularly common phase met by all analysts performing such tasks. Whatever the level of expertise of the analyst, students, young engineers, experts, and specialists in industries or in education schools, all have to struggle with troubleshooting at some point to solve a numerical problem using FEA software. Troubleshooting is therefore a consequence, but what is the cause? Prior to exploration of software features messages pointing out an error or warning issues, the definition of the formulation of a physics problem description into a machine language is the key milestone in minimizing the risk of troubleshooting. So what do analyst call, a consistent conditioning of the finite-element model to ensure its stability with the solver? The present chapter gives a methodology to make this translation between the space of physics to the numerical recipes as a guideline for analysts and good practices to perform FEA.