What are the fundamental architectural views proposed in Krutchenʼs 4+1 model?

What are the fundamental architectural views proposed in Krutchenʼs 4+1 model?
Answer: 1. A logical view, which shows the key abstractions in the system as objects or object classes. It should be possible to relate the system requirements to entities in this logical view.
2. A process view, which shows how, at run-time, the system is composed of interacting processes. This view is useful for making judgments about nonfunctional system characteristics such as performance and availability.
3. A development view, which shows how the software is decomposed for development, that is, it shows the breakdown of the software into components that are implemented by a single developer or development team. This view is useful for software managers and programmers.
4. A physical view, which shows the system hardware and how software components are distributed across the processors in the system. This view is useful for systems engineers planning a system deployment.