An itinerary is simply a plan for what you are going to do, usually for the next week. In the itinerary, you spell out where you will be, at what time, on what day
The sales call report is similar to the itinerary, except it lists what you did as opposed to what you plan to do. Usually sales call reports are for the week preceding.
Once a prospect has become a customer, he requires attention. Periodically checking with the customer to determine his satisfaction with your product, service, or your company in general is a service call.
This is probably the simplest term on this list, but it is the most important. The decision maker is simply what it says; The person who will decide whether to buy from you.
The gatekeeper can be your best friend or your worst enemy. This is the person with the power to grant or deny access to the decision maker. Often it is a receptionist, secretary, administrative assistant, or even a security guard.