One of the basic principles of PSE collaborations is the need to assess and demonstrate additionality, i.e. why ODA is needed to trigger engagements or investments that the private sector would not otherwise make, or make them happen more quickly, on a bigger scale, or more successfully in terms of development outcomes. 

To do so, the SDC builds on best practices and methodologies developed by international organisations and adopted by other like-minded donor agencies.

Eight principles for assessing and enhancing additionality ex ante:

Flow chart for demonstrating additionality ex ante