Another question that is common relates to processed meat products. Once a processed meat product (ham, hot dog, lunchmeat, etc.) package is opened, the product should be good for up to seven days unless another type of date is on the package and has passed. After the seven days, the product should not be consumed.
Primary research is any type of research that you go out and collect yourself. Examples include surveys, interviews, observations, and ethnographic research. A good researcher knows how to use both primary and secondary sources in her writing and to integrate them in a cohesive fashion.
Primary research is defined as factual, firsthand accounts of the study written by a person who was part of the study. The methods vary on how researchers run an experiment or study, but it typically follows the scientific method. One way you can think of primary research is that it is typically original research.