The purpose of these Key Sheets is to provide decisionmakers with an easy and up-to-date point of reference on issues relating to the provision of support for sustainable livelihoods. This paper looks at the nature of different aid modalities, suggesting that while 'sector approaches' and General Budget Support have become the dominant modalities, there are various other approaches which can add greater balance to aid programmes. It looks at the various considerations necessary when choosing such aid modalities.