"In this model, the intervention (a new teaching approach) does not lead DIRECTLY to the ultimate desired effect (improvement in reading overall).
Rather, the theory of action or proposed causal chain is that teaching improves the children’s ability to understanding reading text and that, in turn, leads to improved reading more generally.
A positive shift in asttle reading is a desired effect of the intervention and a intermediary outcome. In this model the intervention would only be partially successful if it led to improved reading but improved reading did not contribute to more generalised reading achievement".
Here is my causal chain.