Difference between case study and naturalistic observation

Case study refers to an experimental design (used to examine whether or not the intervention/procedures are in fact responsible for change), while "naturalistic observation" refers to a method and environment for data collection. A primer on experimental design and methods of data collection is beyond the scope of this forum, but some highlights which may be of help appear below. Naturalistic observation is a method of data collection which may be used as part of a case study.

In financial aspects, a depression is a sustained, long haul downturn in monetary movement in one or more economies. it is a more extreme monetary downturn than a recession, which is a slowdown in financial action through the span of a typical business cycle. a depression is an irregular and extreme type of recession. so depression is always followed by recession but it is not correct to state that a depression always follow a recession.