Top-Down & Bottom-Up Design Approaches

In software design, the Top-Down and Bottom-Up approaches play a crucial role. Top-Down design involves breaking down the system from a high-level overview to detailed components, ideal for well-defined problems. On the other hand, Bottom-Up design starts with basic modules that are further refined, suitable for complex or undefined problems. Both methods offer distinct advantages in software development.

• Software Design
• Top-Down
• Bottom-Up
• Methodologies
• Development

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Uploaded on Mar 08, 2025 | 0 Views

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Presentation Transcript

1. Top-down & Bottom-up Design Approaches

2. Top-down & Bottom-up Design Methods Applicable to all methodologies Top-Down Top-level description decomposed to lower-level, small modules Bottom-Up Basic set of modules and interrelationships formulated to higher-level concepts

3. Top-down Level-oriented design Iterative process of decomposition Allows for early evaluation of functional capabilities Best suited when problem & environment are well- defined Ex: designing a compiler

4. Top-down design methodology A popular design methodology for software is Top- Down design and Bottom-up coding. It starts with a specification of the system at the top level. This top-level is then broken down into major tasks and subtasks. Each major task (and subtask) is broken down into smaller subtasks as appropriate. 4

5. Top-Down Design Graphical illustration of the Top-down design methodology. The number of levels continues until the subtask is one that can be directly coded. 5

6. Bottom-up Yields smaller and more agile programs Promotes code re-use Permits assessment of sub-modules Best suited when problem is ill-defined or missing

7. Bottom-up approach

8. Bottom-up approach