A third perspective is "chemical education research" (CER). Following the example of physics education research (PER), CER tends to take the theories and methods developed in pre-college science education research and applies them to understanding comparable problems in post-secondary settings. (CER also tries to improve pre-college chemistry instruction). Like science education researchers, CER practitioners tend to study the teaching practices of others as opposed to focusing on their own classroom practices. Chemical education research is typically carried out "in situ" using human subjects from secondary and post-secondary schools. Chemical education research collects both quantitative and qualitative data. Quantitative methods typically involve collecting data that can then be analyzed using various statistical methods. Qualitative methods include interviews, observations, journaling, and other methods common to social science research.