This paper summarizes the task design for iCLEF 2006 (the CLEF interactive track). Compared to previous years, we have proposed a radically new task: searching images in a naturally multilingual database, Flickr, which has millions of photographs shared by people all over the planet, tagged and described in a wide variety of languages. Participants are expected to build a multilingual search front-end to Flickr (using Flickr's search API) and study the behaviour of the users for a given set of searching tasks. The emphasis is put on studying the process, rather than evaluating its outcome. Categories and Subject Descriptors H.3 [Information Storage and Retrieval]: H.3.1 Content Analysis and Indexing; H.3.3 Information Search and Retrieval; H.4 [Information Systems Applications]: H.4.m Miscellaneous General Terms interactive information retrieval, cross-language information retrieval Keywords CLEF, iCLEF, Flickr, online photo sharing, multilingual image search, user studies, evalu...