Choosing the right sampling method, be it cluster, stratified, sequential or simple, can make a dramatic difference to the accuracy of your results. In some cases the best option can allow you to reduce your sample size and thus costs. Of course if you get it wrong you will pay the price, so in this overview of the importance of sampling methods when designing your surveys, Nigel Marriot will demonstrate how you can decide which to use with the help of some playing cards and your willing participation!