I would say a salesman or woman would most benefit from a custom slide show that shows a product, explains what it is, where it comes from, how it is made and especially how it can be used to benefit an organization as these things or qualities should be fairly cut and dried and well worked out unlike say a technique that depends on the circumstances like installing a piezometer (an instrument to read water pressure) in a drill hole in which case a particular slide show rather than a custom one would have to be used.
