Because the interpretation of the results depends very much on how we established the finite element model, what kind of analysis or model we used, and so on. In establishing the finite element model, we have to be aware of what kinds of elements, methodology, techniques, and so on are available to us. So that we can build an equal FE model for our analysis. after getting your first iteration result than we have to compare the result with actual test data, if the results are not near to experimental test data then we have to again establish the FEA model as per test data, so that we can come closer to accurate results and process go on.