BB cream is promoted as an all-in-one facial cosmetic product to replace serum, moisturizer, primer, foundation and sunblock. It can be worn alone as a tinted moisturizer, over serum and moisturizer as a regular foundation, and under powder, depending on the desired amount of coverage. 1  1 History.  2 Formulations.
Definition. Naturalistic observation is research that involves studying the subject of interest in its own environment, as it would occur in day-to-day life. The subject of interest may be human or non-human or it can be the behavior of living things or the interactions of non-living things with their environment.
Definition of Participant Observation. The participant observation technique that Rosenhan used differs from naturalistic observation in that the observer is not only part of the observed environment but also a participant in the situation being studied.he participant observation technique that Rosenhan used differs from naturalistic observation in that the observer is not only part of the observed environment but also a participant in the situation being studied.