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.
While naturalistic observation can be useful in many cases, this method also has some potential downsides that must be considered. One of the disadvantages of naturalistic observation includes the fact that it can be difficult to determine the exact cause of a behavior and the experimenter cannot control for outside variables. Some other disadvantages of naturalistic observation: 1  People may behave differently when they know they are being watched. 2  People may try to behave in a certain way in order to conform with what they think the researchers expects to see.