The CLEF Text Retrieval System Evaluation activity is coordinated in Europe by the
DELOS Network of Excellence for Digital Libraries
and organised in collaboration with the US National Institute of Standards and Technology (NIST) and the TREC Conferences

The CLEF series of system evaluation campaigns aims at promoting research and development in Cross-Language Information Retrieval (CLIR) by (i) providing an infrastructure for the testing and evaluation of information retrieval systems operating on European languages in both monolingual and cross-language contexts, and (ii) creating test-suites of reusable data which can be employed by system developers for benchmarking purposes.