A travel agency offers customers a range of ways to make holiday bookings in store, online and through their call centres. Revenues are generated through different commission rates on holidays paid by tour operators (the actual suppliers of the holiday products). The company prides itself on delivering customer satisfaction. Therefore, management is keen to research customer satisfaction levels across the different booking methods and by tour operators (some tour operators offer higher commission margins). To determine the level of customer satisfaction, the companys management has decided to use a survey of all types of customers and have asked you to devise an appropriate sampling scheme. Explain in detail how each of the following sampling methods could be applied to the overall sampling strategy for this study. Make sure you describe the merits and limitations of each as well as how each would be applied in practice.

a). Systematic sampling

b). Stratified sampling.