I start by making a full assessment of the horse by checking how their conformation is put together, how their back shape is, how they are standing, hoof balance, how they move their shoulders, their depth of girth where girth sits, and how they are trained. Their musculature can give you an indication of how they are going to move, and what influence that will have over the saddle and then if there is work going on to improve that, you have to take into consideration what the client is going to do.