Slide 1 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 2 Input: Temperature, humidity, light Process: Check the temperature and turn heater on/off Output: Correct growing conditions, resulting in healthy plants Greenhouse

Slide 3 Lighthouse Input: Visibility Process: Is visibility poor? Output: Turn on fog horn

Slide 4 Washing machine Input: Wash programme, water, washing powder Process: Match amount of water, temperature to programme Output: Clean washing

Slide 5 Security light Input: Movement Process: Is light below a predefined level? Output: Turn on light

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 What is a system? A computer system ‘may include hardware, as well as software and manual procedures’. BCS Glossary of computing terms

Slide 8 Today you will: Review knowledge and understanding of systems

Slide 9 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 10 Start Put tea in pot Milk? Stop Pour milk into cup Boil water Add water No Wait until brewed Yes Milk? Pour milk into cup Yes Sugar? No Pour tea into cup Yes Add sugar Making tea Drink tea

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

Identify Outline of the problem Analyse The needs of the system Evaluate Refining the system Design Planning all parts of the system Implement Creating the system Test Making sure the system works System life cycle