Subjective, individual, and aggregate references in educational research are distinguished. A particular method may center around a particular type of reference. Uses and misuses are described. Compatible relationships are indicated. The overall process is seen within a general principle of uncertainty reduction.Methods of research in education do not enjoy the prestige of methods in other areas. It may be difficult to find improvements in educational practices that are the result of educational research. Some of the difficulty lies in the nature of the subject matter. Education embraces a massive social hierarchy, with all its levels and systems within systems. The very size of the complexity makes it difficult for research to have an impact on practice. Part of the problem, however, also lies in the methods used for educational research. The knowledge provided by research is limited by the nature of the information used and how it is processed. Increased distinctions in the nature of this information should make it easier to get the kind of information needed. The following seeks to clarify some fundamental distinctions in the nature and uses of some types of information in educational research.For the purposes of highlighting certain relationships, references to information will be classified as being subjective, individual, or aggregate. Subjective references lack connection to specific, identifiable, concrete, objective events. Although possible connections may be implied, there is no available designation or limitation as to what they are. Individual references are connected to objective events that can be clearly discriminated from other individual events. Inter-observer agreement may be used for confirmation. Aggregate references are to collections of individual events. The reference is to the collection as a collection.