Another important difference between the factors associated with area of origin and area of destination is related to stages of the life cycle.
For many migrants the area of origin is that in which the formative years have been spent and for which the general good health of youth and the absence of annoying responsibilities create in retrospect an over-evaluation of the positive elements in the environment and an under-evaluation of the negative elements.
On the other hand. the difficulties associated with assimilation in a new environment may create in the newly arrived a contrary but equally erroneous evaluation of the positive and negative factors at destination.