Date post: | 01-Apr-2015 |
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Slide 1
Today you will:
Review knowledge and understanding of systems
Understand what a system is and what it consists of
Apply this understanding by working through the input, process and output of example systems
Arrange different processes of a system in order
What is the systems life cycle?
Slide 2
What is a system?
A computer system ‘may include hardware, as well as software and manual procedures’.
BCS Glossary of computing terms
Slide 3
What makes up an information system?
Input
Process
Output
Temperature and rainfall from a variety of places
Analyse the information and present graphically
Web pages for holidaymakers to help them decide when and where to go
Slide 4
Slide 5
Washing machine
Input: Wash programme, water, washing powder
Process: Match amount of water, temperature to programme
Output: Clean washing
Slide 6
Pelican crossing
Input: Pedestrian presses walk button
Process: Has the set amount of time gone by?
Output: Activate the light sequence
Slide 7
Making tea
Pour tea into cup
Put teabag in pot
Fill kettle
Add milk
Put the instructions in the right order.
Identify any instructions that are missing.
Slide 8
Start
Put tea in pot
Milk? Stop
Pour milk into cup
Boil water
Add water
No
Wait until brewed
YesMilk?
Pour milk into cupYes
Sugar?
No
Pour tea into cup
Yes
Add sugar
Making tea
Drink tea
Slide 9
•In a flowchart everything is in a sequence. What does that mean?
•What would happen if you swapped the first and third activities
•What would happen if you swapped the milk and sugar around?
Question Time
Slide 10
•In a flowchart everything is in a sequence. What does that mean?
One event at a time, in the right order
•What would happen if you swapped the first and third activities
It wouldn’t make sense or very nice tea
•What would happen if you swapped the milk and sugar around?
It wouldn’t matter
Slide 11
Cooking a celebration lunch
Prepare main dish
Put main dish in oven
While main dish cooks, prepare vegetables
Put potatoes on to cook
Put vegetables on to cook
Arrange all times to coincide with main dish being ready
Lay table
IdentifyOutline of the problem
AnalyseThe needs of the system
EvaluateRefining the system
DesignPlanning all parts of the
system
ImplementCreating the system
TestMaking sure the system
works
System life cycle
Slide 13
Read through the memo/letter
Slide 14