The document discusses the value and use of secondary data. It provides several reasons for using secondary data, including allowing for replication and confirmation of results which is important for the scientific process. Secondary data also ensures that resources spent on data collection are used to their full potential. The document also notes that secondary data is valuable for students, postdocs, and junior faculty. It provides statistics on graduate students and others using secondary data at ICPSR and discusses common uses of secondary data in class assignments, papers, and presentations. The document outlines elements of a replication paper as a way for graduate students to get published.