Abstract: A method and structure for monitoring product development is provided. In accordance with the method of this invention the product development is divided into a plurality of stages. Each stage in turn includes a set of requirements which must be completed in order for the stage to be completed. Each requirement is provided with a unique identifier for ease of reference to the requirement. Each requirement also has associated with it an indicium for indiciating the status of that requirement (i.e. whether the requirement is complete or not). Each stage and its requirements are capable of being visually displayed, typically on a display unit connected to a computer system. Thus a user is capable of easily determining the instantaneous status of the development of the product by reviewing each of the requirements of each of the stages of the product development and determining from the display the status of each requirement.

Abstract: Hydraulic jet propulsion apparatus having steering deflectors which are hydraulically balanced which operate against a seal to reduce spillage and to reduce jamming ans which will provide a smooth contour for the flow of water while not restricting the cross-sectional area of the jet stream. The apparatus also provides a reversing duct which is operable to intercept the jetstream, downstream of the steering deflectors so that the jetstream is divided into two streams the relative proportions of which depend upon the operation of the steering means each stream being turned while in the duct through an angle in excess of 90 degrees to emerge in diagonal directions respectively forward-to-port and forward-to-starboard so as to produce a reverse thrust with steering dependant on the relative proportions of flow in the two streams.