（ ）analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the（ ）for designing and constructing an improved system.（请作答此空）is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called（ ） 、 （ ） is another such technique that integrates data and process concerns into constructs called objects.