Top-Down Design Damian Gordon. Top-Down Design Top-Down Design (also known as stepwise design) is breaking down a problem into steps. In Top-down Design.

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Presentation transcript:

Top-Down Design Damian Gordon

Top-Down Design Top-Down Design (also known as stepwise design) is breaking down a problem into steps. In Top-down Design an overview of the problem is described first, specifying but not detailing any first-level sub-steps. Each sub-step is then refined in yet greater detail, sometimes in many additional sub-steps, until the entire specification is reduced to basic elements.

Example Making a Cup of Tea

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example 1.Organise everything together 2.Plug in kettle 3.Put teabag in cup 4.Put water into kettle 5.Turn on kettle 6.Wait for kettle to boil 7.Add boiling water to cup 8.Remove teabag with spoon/fork 9.Add milk and/or sugar 10.Serve

Example : Step-wise Refinement Step-wise refinement of step 1 (Organise everything together) 1.1 Get a cup 1.2 Get tea bags 1.3 Get sugar 1.4 Get milk 1.5 Get spoon/fork.

Example : Step-wise Refinement Step-wise refinement of step 2 (Plug in kettle) 2.1 Locate plug of kettle 2.2 Insert plug into electrical outlet

Example : Step-wise Refinement Step-wise refinement of step 3 (Put teabag in cup) 3.1 Take teabag from box 3.2 Put it into cup

Example : Step-wise Refinement Step-wise refinement of step 4 (Put water into kettle) 4.1 Bring kettle to tap 4.2 Put kettle under water 4.3 Turn on tap 4.4 Wait for kettle to be full 4.5 Turn off tap

Example : Step-wise Refinement Step-wise refinement of step 5 (Turn on kettle) 5.1 Depress switch on kettle

Over to you…

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