Correlation and longitudinal research design could be used to measure how relationship satisfaction changes over time.
When using a correlational study design, no variables are within the researcher's direct control or manipulation. The degree and/or direction of the association between two (or more) variables is reflected in a correlation. A correlation may go in either a positive or negative direction. while In a longitudinal study, the same subjects are periodically examined to look for any changes that might happen over time. In longitudinal studies, a sort of correlational research, researchers watch and gather information on numerous factors without attempting to change them.
Over time, sometimes for several years, researchers make numerous observations of the same subjects to measure how relationship satisfaction changes over time through Correlation and longitudinal design.
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