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True or False An object model can be developed when applying a structured method. In the spiral model we do risk assessment once in all loops. Software engineering is concerned with aspects of software production. Non-functional requirements are as system properties or constraints. We document the requirements in simple natural language. System requirements are completely separable from system design A state-machine model describes system response to internal events. A class is the type of definition of an object, instantiated at run-time. A system context is a dynamic model while the model of use is a static description of the system with its environment. An object model can be developed when applying a structured method. In the spiral model we do risk assessment once in all loops