tailieunhanh - System Analysis, Design, and Development Concepts, Principles, and Practices phần 2

Một lớp nên có một mục đích rõ ràng, thiết kế và API. • Một lớp API xuất khẩu nên có một số tờ khai dành riêng cho các mục đích tương thích ngược trong tương lai. • API nên cung cấp mức độ thích hợp đóng gói, che giấu dữ liệu tức là thành viên. • Hữu nghị của một lớp nên được giữ ở mức tối thiểu để bảo quản đóng gói. | Simpo PDF Merge and Split tee eany ýsỉnn-Elỉmn tures of each entity within the system hierarchy. Third the system elements serve as an initial starting point for allocations of multi-level performance specification requirements. Despite strong technical and analytical skills engineers are sometimes poor organizers of information. Therein lies a fundamental problem for the engineering of systems. Being able to understand and frame structure the problem is 50 of the solution. The organizational framework of the System Element Architecture concept provides the framework for defining the system and its boundaries. The challenge in analyzing and solving system development and engineering problems is being able to identify organize define and articulate the relevant elements of a problem objectives initial conditions assumptions etc. in an easy-to-understand intelligible manner that enables us to conceptualize and formulate the solution strategy. Establishing a standard analytical framework enables us to apply plug and chug mathematical and scientific principles the core strength of engineering training to the architecture of the system. Problem Solving to Reduce Complexity System analysis and engineering is deeply rooted in the concept of analytically decomposing large complex problems into manageable problems that can be easily solved. Unfortunately many engineers lack the training to be able to organize structure and analyze a system problem around its system elements. In practical terms you should ingrain this concept as a basis for organizing and structuring relevant parts your problem. However a word of caution Avoid temptation to tailor out relevant system elements without supporting rationale that can withstand professional scrutiny. You may pay a penalty in overlooked system design issues. For now we have one remaining system element concept to introduce entity relationships ERs . UNDERSTANDING SYSTEM ELEMENT ENTITY .