ETS 163 – European Social Charter (Revised), 03.V.1996 __________________________________________________________________________________ 12 to promote and facilitate, as far as practicable, the teaching of the migrant worker's mother tongue to the children of the migrant worker. Article 20 – The right to equal opportunities and equal treatment in matters of employment and occupation without discrimination on the grounds of sex With a view to ensuring the effective exercise of the right to equal opportunities and equal treatment in matters of employment and occupation without discrimination on the grounds of sex, the Parties undertake to recognise that right and to take appropriate measures to ensure or promote its application in the following fields: a access to employment, protection against dismissal and occupational reintegration; b vocational guidance, training, retraining and rehabilitation; c terms of employment and working conditions, including remuneration; d career development, including promotion. Article 21 – The right to information and consultation With a view to ensuring the effective exercise of the right of workers to be informed and consulted within the undertaking, the Parties undertake to adopt or encourage measures enabling workers or their representatives, in accordance with national legislation and practice: a to be informed regularly or at the appropriate time and in a comprehensible way about the economic and financial situation of the undertaking employing them, on the understanding that the disclosure of certain information which could be prejudicial to the undertaking may be refused or subject to confidentiality; and b to be consulted in good time on proposed decisions which could substantially affect the interests of workers, particularly on those decisions which could have an important impact on the employment situation in the undertaking. Article 22 – The right to take part in the determination and improvement of the working conditions and working environment With a view to ensuring the effective exercise of the right of workers to take part in the determination and improvement of the working conditions and working environment in the undertaking, the Parties undertake to adopt or encourage measures enabling workers or their representatives, in accordance with national legislation and practice, to contribute: a to the determination and the improvement of the working conditions, work organisation and working environment; b to the protection of health and safety within the undertaking; c to the organisation of social and socio-cultural services and facilities within the undertaking; d to the supervision of the observance of regulations on these matters. 11