Resources
In this 1998 paper, Steve Montague addresses the limitation of logic models in that they have a tendency to direct their attention to causal chains without making reference to who and where the action was.
Montague makes the case that the inclusion of reach into logic models has the potential to improve the strategic focus of organisations, while also making the model more practical for real world managers.
Sources
Montague, Steve. (1998) Build Reach into Your Logic Model. Performance Management Network, available at http://www.pmn.net/wp-content/uploads/Build-Reach-into-Your-Logic-Model.pdf.