Flowcharts 3.3.1.

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Presentation transcript:

Flowcharts 3.3.1

This presentation covers What is a Flowchart? Why are they used? How to draw them.

Introduction Diagrams are great for helping people understand how a system works. However, for those who have no idea how to create a system (generally the customer!) a more simplified method of helping them understand what the system does needs to be used. Flowcharts are simplified diagrams which show basic input, output, decisions and processes. Because they are simplified diagrams they can only be used to show a generalised overview of the system or the functions within it.

Understanding the symbols You can use any symbols that you like...as long as you have a key and stick to it...but these are the more common symbols used. You can see them in the Shapes option in MS Applications... Start/End Input Decision Process Output

Boiling the kettle example Start Yes Is water boiling? Turn off power Add water to kettle No No Heat water Is it full? End Yes Turn on power

Your go... Produce a data flow diagram which: Controls a set of traffic lights over a bridge which only allows traffic to go over it in one direction at a time. Lifts a barrier if it senses a car is stationary on its weight pad and also if the driver has taken a ticket.

Your go again... Go to the online text book or to page 33 of the text book... You will find an example scenario and an activity... Complete the activity.