Ifferences Between the Disease Model and the Harm Reduction Model

Based on the two texts, Beautiful Boyby David Scheff and Tweakby Nicholas Scheff produce a paper that is focused on the following:

Research the differences between the disease model and the harm reduction model. Incorporate the importance of stages of change/treatment in relation to successful recovery attempts. How do these models assist in understanding Nics road to recovery as described by himself and his family?