What are some advantages of top-down modeling as opposed to bottom-up modeling?

Question

What will be an ideal response?

Answer 1

With top-down modeling, the system is first defined, including its hierarchy. In some cases, physical space may be assigned to the assembly as well as to all subassemblies and components contained in it. The function of the system and its components also is articulated at this time. After the framework of the system has been established, engineering teams then work on creating the individual parts and subassemblies that go into the overall system. For example, because the engineers working on subassembly A know that their subassembly connects and interacts with subassemblies B, D, and G, they can collaborate through e-mails or other means as they create their assigned subassembly. Further, the team members working on subassembly A know that the space they occupy cannot encroach on the space occupied by subassembly C and must take that fact into account when they do their design work. Teams working on subassembly B know that they must work with teams working on subassemblies A and C as they complete their assigned task. In this way, efficiency in assembly design is achieved-problems can be solved before they arise. With the bottom-up design approach, problems between subassemblies A and D might not be apparent until the entire design is completed, meaning that all teams need to start from scratch to solve the problem. Top-down assembly modeling is especially effective when multiple teams, many times in different parts of the world, are working on a single design.