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Table 1 Four types of scaling up

From: Planning the scale up of brief psychological interventions using theory of change

Types of scaling up Definition
Vertical scaling up Institutionalization through policy, political, legal, regulatory, budgetary or other health systems changes
Horizontal scaling up Expansion (to serve larger or different population groups) or replication (in different geographic sites)
Diversification Testing and adding a new innovation to one that is in the process of being scaled up
Spontaneous scaling up Diffusion of the innovation without deliberate guidance
  1. Adapted from WHO/ExpandNet framework of scaling up (Simmons et al., 2007)