Once applicants are granted access to the labour market, they should be entitled to a common set of rights based on equal treatment with the nationals of the Member State concerned. Working conditions should cover at least pay and dismissal, health and safety requirements at the workplace, working hours, leave and holidays, taking into account collective agreements in force. Such applicants should also enjoy equal treatment as regards freedom of association and affiliation, education and vocational training, recognition of professional qualifications and, with regard to employed applicants, social security. It is possible for Member States to grant equal treatment also to applicants who are self-employed. Member States are to use their best endeavours to prevent the exploitation of applicants or any form of discrimination against them in the workplace by means of undeclared work practices and other forms of severe labour exploitation.