We believe that this tiered continuum provides a useful model for application of PBS across different settings and populations. Tailoring the tiers to the specific requirements of the setting and the people it supports can aid successful implementation of PBS
The diagram provides some of our brief considerations for developing system wide PBS.

The paper by McGill et al demonstrated the improvements that can be made via a system wide approach to implementing PBS. We feel that these should be core components of any model. Tier 2 & 3 should build on these core components. Any attempts at affecting meaningful change at tier 2&3 will be somewhat dependent on the integrity of tier 1 components.