When appointments were made via phone, schedulers asked patients to repeat back the time and date of their appointment.

FORBES: Persuading People to Keep Appointments

And so there are schedulers within the speaker's office.

NPR: A Quick Trip Through the History of Capitol Hill

The types of assignments and locations will vary, from one project to another, and one company to another, so becoming familiar with the job boards that each company has, getting to know their schedulers, and communicating travel plans, will help to ensure that a shopper finds as much work as he or she is looking for.

FORBES: How I Made $14,000 A Year Mystery Shopping