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Top Down and Bottom Up Design Model
The document discusses two design models: top-down and bottom-up. The top-down model involves breaking down a complex problem into smaller, manageable parts for easier handling, while the bottom-up model emphasizes detailing individual components before integrating them into a complete system. Both approaches have their advantages, such as simplifying problem-solving and allowing collaborative work.
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These slides introduce top-down design, explaining its systematic approach to problem solving and listing its advantages.
Slides provide a practical example of top-down design using a house drawing, breaking it down into manageable parts.
These slides discuss bottom-up design, detailing how individual components are created and combined to form a complete system.
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Top Down and Bottom Up Design Model
- 1. Top Down & Bottom Up Design Model AbdulRahman Sherzad
- 2. Top Down DesignModel » In top-down model, an overview of the system is formulated, without going into detail for any part of it. » Each part of the system is then refined in more details. » Each new part may then be refined again, defining it in yet more details until the entire specification is detailed enough to validate the model. 2 https://www.facebook.com/Oxus20
- 3. Top Down Conceptin Problem Solving » If we look at a problem as a whole, it may seem impossible to solve because it is so complex. Examples: ˃ writing a University System program ˃ writing a word processor » Complex problems can be solved using topdown design, also known as stepwise refinement, where ˃ We break the problem into parts ˃ Then break the parts into parts ˃ Soon, each of the parts will be easy to do 3 https://www.facebook.com/Oxus20
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- 6. Advantages of Top-DownDesign » Breaking the problem into parts helps us to clarify what needs to be done. » At each step of refinement, the new parts become less complicated and, therefore, easier to figure out. » Parts of the solution may turn out to be reusable. » Breaking the problem into parts allows more than one person to work on the solution. 6 https://www.facebook.com/Oxus20
- 7. Example » Problem: outline of thehouse chimney » Write a program that draws this picture of a house. Windows Door 7 https://www.facebook.com/Oxus20
- 8. The Top Level » » » » Drawthe outline of the house Draw the chimney Draw the door Draw the windows Main Draw Outline Draw Chimney Draw Door Draw Windows 8 https://www.facebook.com/Oxus20
- 9. Observation » The doorhas both a frame and knob. We could break this into two steps. Main Draw Outline Draw Chimney Draw Door Frame Draw Door Draw Windows Draw Knob 9 https://www.facebook.com/Oxus20
- 10. Bottom-up Design » Inbottom-up design individual parts of the system are specified in details. » The parts are then linked together to form larger components, which are in turn linked until a complete system is formed. » Object-oriented languages such as C++ or JAVA use bottom-up approach where each object is identified first. 10 https://www.facebook.com/Oxus20
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