Primary Source Information
comes directly from real life data or from the time of an event.
Examples include: statistics, laboratory experiments and reports on the results of those experiments, news reporting that occurs when an event happens, diaries/journals, transcripts of speeches.
Use primary source information to show why your organization is effective in changing the problem-- the organization is very effective or is locally active.
Secondary Source Information
comes from a collection of primary-source data that is drawn together to provide a larger picture view of an event or to provide a recommendation or review.
Examples include: most textbooks, summaries of past research (called "literature reviews"), overviews and encyclopedia summaries, policy or product recommendations.
Use secondary source information to show the existence or scope of the problem you want to change.
Not all resources are created equal! There are a number of criteria to consider when determining whether or not a source is reliable (able to be trusted) and appropriate for your academic work.
Image source: "Evaluation" by NY is licensed under CC BY-SA 3.0