A method and product for modeling and managing requirements in a complex integrated system, which comprises creating a set of requirements which can be implemented within all the components of the complex integrated system. Each requirement may be characterized as a point on the circumference of a circle, the characterization being an assignment of a requirement type. This type determines which circle the point will be located on, assigning a unique immutable numerical value to each requirement that determines in which order the point is placed on the previously determined circle. A location is also determined for each requirement. The location may determine the position of the requirement in relation to other requirements on the circumference of one of the set of circles. Sectors are also formed within the set of circles, as a function of a set of architectural principles and interfaces are identified between points, represented as chords.