There are a number of important questions in the context of any Bayesian analysis which need answering. In particular, the question of sampling from the posterior is still open for further research and is topical in the literature. When using MCMC techniques one has to consider convergence and convergence diagnostics; the feasibility of exact sampling for a particular situation may merit consideration. The nature of the shape of the posterior distribution and how it affects convergence is one which should be examined in detail, for any real application of the techniques.