Marcella's study must meet different requirements EXCEPT convergent validity to establish causality.
Causality is an association between a process and an outcome that can be predicted by fulfilling certain requirements.
In this case, Marcella's study must meet variation between cause and effect, time order and removal of other reasons to establish causality.
Convergent validity can be defined as a measure of a scale that is connected with other variables observed in a given construct.
In conclusion, Marcella's study must meet different requirements EXCEPT convergent validity to establish causality.
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