Civil society in Turkey is going through a rapid transformation. Civil society's building blocks, civil society organisations, are emerging as important actors in Turkey's development and democratisation agendas, while increasing in their numbers and impact. In this context, generating a useful and comprehensive knowledge base has a crucial role to play in promoting the health of the third sector in Turkey. TUSEV has strengthened the sector through its Publications and Research Programme, which has produced over 50 valuable publications on the third sector in Turkey. The CIVICUS Civil Society Index (CSI) project holds a special place among these initiatives. Not only did the first CSI implementation result in the first comprehensive and internationally comparative study on civil society in Turkey, but now the second implementation expands its scope even further and offers readers an opportunity to make comparisons over a five year period.