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Craig Corbett
What is a system flow chart?
                         Entering a room
• A flowchart is a
  diagram which shows             Start

  a task that has been
                            Enter room
  broken down into
  each part and shows
                              Is it dark     No
  when a decision
  needs to be made.         Yes

  Therefore showing        Switch light on

  exactly how the data
                              Sit down
  moves.
                                  End
What do the Symbols mean?
• System flow charts use standard symbols to
  represent each part of the task.

      Start / End   • The beginning and end of the
                      process.


       Decision     • E.g. Is the data valid?


       Process      • E.g. a computer program
                      (automatic process) or filling in
                      a form (manual process)
What are the rules for flow charts?
• All flow charts must
                         Start
  start with the Start
  symbol with only one
  arrow leaving it

• All Flow charts must
                         End
  finish with the End
  Symbol with only one
  arrow leading to it.
What are the rules for flow charts?
• Flow charts have
  processes. These are
  instructions or actions
  that need to be done.
• The processes can be
  automatic or manual.
• A rectangle signifies
  the processes with an
  arrow going in and one
  coming out.
What are the rules for flow charts?
• Flow charts also include
  ‘decisions’.
• Most decisions are
  questions i.e. ‘ is it
  dark?’                            No
• A diamond shape
  signifies a decision.
• There maybe a number        Yes
  of arrows showing
  different options leaving
  them and in some cases
  it may allow a step to be
  missed out.
What are the rules for flow charts?
              Entering a room

Start / End         Start
Symbols

                Enter room
                                 Process / action
Decision
                  Is it dark


               Switch light on


                  Sit down


                    End
Test Your Knowledge
                 Ordering Lunch
• Can you identify        Start

  where the
                     Order a sandwich
  following are in
  the flow chart:         Want          Yes
                                              Order crisps
• Start                  Crisps?
                         No
• End
                          Want          Yes
• All processes           drink?              Order drink
                         No
• All decisions
                         Sit down

                           End

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Flowcharts

  • 2. What is a system flow chart? Entering a room • A flowchart is a diagram which shows Start a task that has been Enter room broken down into each part and shows Is it dark No when a decision needs to be made. Yes Therefore showing Switch light on exactly how the data Sit down moves. End
  • 3. What do the Symbols mean? • System flow charts use standard symbols to represent each part of the task. Start / End • The beginning and end of the process. Decision • E.g. Is the data valid? Process • E.g. a computer program (automatic process) or filling in a form (manual process)
  • 4. What are the rules for flow charts? • All flow charts must Start start with the Start symbol with only one arrow leaving it • All Flow charts must End finish with the End Symbol with only one arrow leading to it.
  • 5. What are the rules for flow charts? • Flow charts have processes. These are instructions or actions that need to be done. • The processes can be automatic or manual. • A rectangle signifies the processes with an arrow going in and one coming out.
  • 6. What are the rules for flow charts? • Flow charts also include ‘decisions’. • Most decisions are questions i.e. ‘ is it dark?’ No • A diamond shape signifies a decision. • There maybe a number Yes of arrows showing different options leaving them and in some cases it may allow a step to be missed out.
  • 7. What are the rules for flow charts? Entering a room Start / End Start Symbols Enter room Process / action Decision Is it dark Switch light on Sit down End
  • 8. Test Your Knowledge Ordering Lunch • Can you identify Start where the Order a sandwich following are in the flow chart: Want Yes Order crisps • Start Crisps? No • End Want Yes • All processes drink? Order drink No • All decisions Sit down End