<Li> Vice-President of Marketing Research: This is the senior position in marketing research . The VP is responsible for the entire marketing research operation of the company and serves on the top management team . Sets the objectives and goals of the marketing research department . </Li> <Li> Research Director: Also a senior position, the director has the overall responsibility for the development and execution of all the marketing research projects . </Li> <Li> Assistant Director of Research: Serves as an administrative assistant to the director and supervises some of the other marketing research staff members . </Li> <Li> (Senior) Project Manager: Has overall responsibility for design, implementation, and management of research projects . </Li>

When did the telephone become an accepted tool for primary data collection in marketing research