The Group of Experts on Action against Trafficking in Human Beings (GRETA) has been set up pursuant to Article 36 of the Council of Europe Convention on Action against Trafficking in Human Beings (“the Convention”), which entered into force on 1 February 2008. GRETA is responsible for monitoring the implementation of the Convention by the parties and for drawing up reports evaluating the measures taken by each party. In accordance with Article 38, paragraph 1, of the Convention, GRETA evaluates the implementation of the Convention following a procedure divided into rounds. At the beginning of each round, GRETA selects the specific provisions on which the evaluation procedure is to be based and defines the most appropriate means to carry out the evaluation. GRETA adopts a questionnaire for each evaluation round which serves as the basis for the evaluation and is addressed to all parties.