The binding legal principles established are: (1) Instructions contained in administrative circulars from government departments to other departments do not automatically become contractual terms between an employer and employee, even where such circulars form part of the background to an employment contract. (2) Where pension benefits are regulated by statute and fund rules (as under Proclamation 21 of 1996), an employee's entitlement to such benefits arises against the pension fund, not the employer, and is governed exclusively by the statutory provisions. (3) The term 'promptly' in the context of pension benefit payments must be interpreted in accordance with the applicable statutory prescripts (in this case Article 26 of the Proclamation), not as creating a more onerous obligation. (4) Employers cannot be held to have contractually undertaken to pay pension benefits on more favorable terms than those prescribed by statute, absent clear and express language to that effect, particularly where such undertaking may be prohibited by the governing legislation (Articles 20(1) and 26 of the Proclamation).