(41)In order to ensure that clients' interests are not impaired, investment firms should design and implement remuneration policies to all persons who could have an impact on the service provided or corporate behaviour of the firm, including persons who are front-office staff, sales force staff or other staff indirectly involved in the provision of investment or ancillary services. Persons overseeing the sales forces, such as line managers, who may be incentivised to pressure sales staff, or financial analysts whose literature may be used by sales staff to entice clients to make investment decisions or persons involved in complaints-handling or in product design and development should also be included in the scope of relevant persons concerned by remuneration rules. Relevant persons should also include tied agents. When determining the remuneration for tied agents, firms should take the tied agents' special status and the respective national specificities into consideration. However, in such cases, firms' remuneration policies and practices should still define appropriate criteria to be used to assess the performance of relevant persons, including qualitative criteria encouraging the relevant persons to act in the best interests of the client.