||To create a snapshot of the current state of affairs
||Provides a relatively complete picture of what is occurring at a given time. Allows the development of questions for further study.
||Does not assess relationships among variables. May be unethical to participants if they do not know they are being observed.
||To assess the relationships between and among two or more variables
||Allows testing of expected relationships between and among variables and the making of predictions. Can assess these relationships in everyday life events.
||Cannot be used to draw interferences about the causal relationships between and among variables.
||To assess the causal impact of one or more experimental manipulations on a dependent variable
||Allows drawing of conclusions about the causal relationships among variables.
||Cannot experimentally manipulate many important variables. May be expensive and time consuming.