Scale up and Spread
Sustainability is when new ways of working and improved outcomes become the norm. In other words, when an improvement has become integrated and the mainstream way of working. It should withstand challenge and variation over time, through a process of continuous improvement.
Scale up is the process by which new working methods are tested by an increased number of teams, to increase degree of belief they work, overcoming system/infrastructure issues that arise.
Spread is when best practice is disseminated consistently and reliably across a whole system and involves the implementation of proven interventions in each applicable care setting.