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