I am advised by the Revenue Commissioners that the general approach, as part of their published code of approval practice, is to approve a group scheme in which two or more employers participate provided that the employers are sufficiently closely associated to be treated as carrying on a single trade or undertaking. This condition is met if the employers all belong to a group of companies forming a single financial unit, e.g. if they are parent and subsidiary, or fellow subsidiaries of the same parent. For this purpose, a company may be regarded as a subsidiary if at least 50 per cent of its equity share capital is owned by the other, directly or indirectly. Alternatively, even though no parent-subsidiary relationship exists, there may be enough links between the employers to warrant a group scheme based on close association through permanent community of interest. Such links could be common management or shareholder, interchangeable or jointly employed staff and interdependent operations e.g. one selling the bulk of the other's products.