: A study conducted in intervals that allow several companies to purchase a few questions on a single survey that will be administered to a large audience. The survey results for each question will be delivered to the company that posted that particular question as well as surveyed demographic information. This is also known as a piggyback survey.

: A way of obtaining permission from participants so that they may be contacted in the future. Double-opt in refers to participants that sign up for a service online and are then sent an email in which they confirm to the service by responding to the email's prompts. They are essentially agreeing twice to be involved with a particular company.

: A scale that allows categories to be ranked in order from smallest to largest-even though the space between two categories is insignificant. Example responses might be excellent, good, fair, and poor.

: A group of respondents that participate in multiple surveys over an extensive period of time. Respondents willing participate with the market research project in return for some compensation. Specialty panels can be created for specific samples (eg doctors, IT professionals, youth), or for specialist research and product testing. Traditionally, panels are used for a wider range of projects, including general and consumer research. There are massive panels and databases of people available for research.