2. a) Define a computer system b) Describe the importance of computer systems in the modern world c) Explain the need for reliability in computer systems d) Explain the need for adherence to professional standards in the development, use and maintenance of computer systems e) Explain the importance of ethical, environmental and legal considerations when creating computer systems.

3.  We’re surrounded by a multitude of computer systems in every day life that: › Keep us safe › Enable us to do our jobs › Entertain us › Run our homes › Enable us to communicate with other people

4.  Apart from obvious (laptops\PCs) Embedded computer system to control functions.  Handles complex wash cycle  Ensures correct amount of water is used  Water heated to correct temp.

5.  Embedded computer systems – invisible  Developed by engineers – Easy life

6.  Set top satellite box  Contains a computer system that: › Checks subscriber account is valid – reads inserted smart card › Handles channel decryption › Electronic Program Guide › Handle recording & playback  Blue Ray\DVD player  TV – stream content from internet  Smart Phone

7.  Heavily reliant on CS’s to do job effectively  Help to create professional work  Hopefully mistake free  Collaboration – work with people on other side of the world, from home & on the move. Share documents  Teleworking

9.  ATM – cash & other services  Keeping accounts secure (1995- 20 million credit card details stolen – poor security)  Keep track of customer accounts  Online banking

10.  X-Rays, CAT\MRI scanners, blood analysis  IV & radiotherapy machines  Monitoring: blood pressure & heart rate  Admin systems: patient booking stock control  NHS wasted £12 billion on computer system that was never used

11.  School network – hot desking  Library system  Attendance system (SIMS)  Biometric systems

12.  Online ticket booking system  Touch screens – ticket printing  Projector & audio system  Air conditioning system

13.  Very complex supply chain – where correct item needs to be in right place at right time. (from bread rolls to a tank)  Logistics handled by systems that track items using barcodes & RFID

14.  Weapon systems with sophisticated on- board CS – pin point accuracy  Connects to GPS satellites to work out its current path in real time

15.  Command & control – chain of command (Iraq – 120,000 US troops)  General issues orders to officers – officers to troops etc  Requires reliable, tough comms. System  Military systems include: › Digital radio backpack › Sophisticated satellites

16.  21 st century soldier  “situational awareness” is key term  Imagine platoon where all soldiers know where their comrades are in real-time – through helmet mounted graphical display.  Connect to RT video feeds from hovering cameras. Becoming reality – computer systems are at the heart

17.  Almost 100% reliant on CS’s we need to be able to trust that they will be reliable. When they go wrong it can range from being an inconvenience to life threatening.

18.  Tesco Bank – customers still unable to access online accounts – several days – computer glitch.  Vodaphone mobile network disrupted after break-in at its exchange  Facebook says its suffering its worst shutdown in 4 years

19.  Many computer systems have thousands \ millions of lines of code  Limitless pathways through them  Testing is vital to ensure systems are reliable  Testing very expensive & time consuming – many bugs are missed

20.  They’re everywhere  Take for granted their impact on our lives