Most subsea installations have their own, integrated control and automation systems. In cases where this is impossible or the mechanism fails, the only unit that can handle such problems is the ROV. This makes the ROV essential for subsea intervention. However, challenging conditions makes the ROV operations difficult. This report will present a new tool called RITS - ROV Intervention Tool Skid, created to simplify these subsea operations.The RITS system is developed by utilizing conventional subsea technology only. The main idea is to introduce a fixed docking solution. It will ensure a rigid and fixed position between the ROV and the ROV panels. The docking receptacle, an API 17D, will secure a completely locked connection to the subsea unit. From this rigid position the operator may perform the work without any disturbance of the water flow.The locked position provides new opportunities for the ROV; it opens for pre-programmed control of the manipulator and other tools. Robotics technology is frequently used in the onshore industry; however lack of fixed positions has previously excluded robotics subsea. This is changed by the new docked position, and an example of a pre-programmed manipulator will be presented as a part of this thesis.A manipulator requires a hydraulic system, which can be designed to operate more than one manipulator. The hydraulic systems are controlled by an embedded control unit connected to a computer with a control screen (HMI). The extra capacity of the hydraulic system is used to operate special tools, which are installed inside cassettes. RITS will be able to carry three cassettes at the time, and the customer can choose between five cassettes depending of what kind of operation the ROV is supposed to perform. The different cassettes all contain different tools, and since an HPU is installed, even a hot stab cassette is possible. This study indicates that the cassettes, the manipulator and the HPU system developed will work. The docking system however needs extensive testing before RITS can be produced. If the docking gives satisfying results during the tests, all the required documentation and design specifications are presented. The docking solution is the component making all the other systems possible.The RITS should therefore be able to improve the working situation for the ROV operations.