This talk addresses the task of computational modelling of problems in biomechanics. In this the first step is to select a mathematical model based on physical knowledge of the problem, and it is necessary to assess the realism of the model ; Validation. A numerical solution of the model is then required, for which we use finite element techniques. The accuracy of the numerical solution then needs to be determined; Verification. Finally the accuracy of the problem data needs to be considered, and a way of doing this is via Experimentation. Strategies for implementing these steps will be discussed in the context of the acoustic wave problem below.