Definitions:
Mystery shopping - following a set brief and reporting on service
recieved in shops, eating places, leisure services and telephone
helplines.
Merchandising - going into a store on behalf of a manufacturer with the
aim of promotion their product. You might have to increase shelf space,
set up secondary displays, add point of sale material or set up
promotional stands.
Auditing - going into a store on behalf of the manufacturer and
reporting what is there. Typical things to find out are stock levels,
number of facings for each product, shelf measurements and/or floor
space.
Market Research - speaking with members of the public and asking their
opinions on various things. Sometimes it's standing in the street, or
it could be knocking on doors.
Demonstrating - we've all seen them! People who give away free samples
in shops or show you how products work.