If you are willing to go further and beyond in your research then you should include Mediator & Moderator because it will take you past studying just a simple relationship between two variables and gives a full legit picture practically of the real world. They are very fundamental to bring to attention specially, when you are studying a correlational relationship that is too complex or just a casual relationship.
Mediators of an effect are casual pathways which tells you how did the effect take its place and when it did while moderators will assist you with verdict of an external validity of your study by helping to realize the limitations of the relationship between two variables.
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