Equifinality refers to the concept that similar outcomes may stem from different early experiences.
The principle of Equifinality states that in any closed System the final state is determined by the initial conditions, in Psychology, it refers to how different early experiences in life (examples, parental divorce, physical abuse, parental substance abuse) can lead to similar outcomes (e.g., childhood depression). In other words, there are many different early experiences that can lead to the same psychological disorder.
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A list of books about the topic Equifinality