Timeline for change
Some factors contributing to positive deviance go back to the childhood of
the parents or to earlier circumstances in the history of the parents or to
earlier circumstances in the history of the family or the subculture.
Cross-sectional research approaches should not ignore these historic factors.
Different types of change also require different lengths of time to achieve.
Programmatic trials should not assume that attitudes and behaviours that prove
resistant in the short run will not yield to change over longer