With the sad decline in the standards of mediumship the most important aspect is how good is a development teacher. This all important aspect cannot be emphasised enough. Not all great mediums make good teachers. Not all good teachers are great mediums. It is not good enough to study aspects of mediumship, throw that together with a few years experience and decide that you are able to teach to a sufficient level. Having knowledge and being able to pass it on are not necessarily the same thing.