Time was also a factor in a study of the tasks performed by school principals in school districts of different sizes. After the researcher discovered that many principals' schedules prevented them from being interviewed at the times he had available, he substituted mailed questionnaires for interviews.
The above set of four standards and conditions obviously fails to exhaust the considerations researchers may adopt as they decide how they will gather data. Additional factors can include a researcher's particular training and talents, distances to travel for collecting data, parents' willingness to have their children participate in research projects, government regulations about the right to privacy, pressures of political groups to prevent or to encourage certain types of research, and more.
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