AS Computing

During the design stage a number of decisions have to be made about the human computer interface to ensure it is appropriate for users with different skill levels. It also has to be suitable for use in different environments.

System Life Cycle - Analysis stage

DFDs are used as a method of documenting the flow of data through the current system.
A variety of symbols can be used however the WJEC specification uses the following

Task 1 - A college library system identifies each book in its stock by a unique BookID. The BookID is encoded in a barcode attached to the book. When a borrower returns a book it is scanned and any fine due is calculated by extracting from teh library database the date that the book was due back.
Draw a Data Flow Diagram that models the library loans system.

Task 2 - Answer the exam question using a Word document.

Watch each of the video clips from the BBC news.

• Teleworking - is it suitable for everyone and Teleworking - using ICT to work from home;
• Online Gambling;
• Microprocessors and Robots;
• Internet shopping 1 and 2.

Complete the accompanying worksheets and save into your AS Computing Theory folder.



http://www.bbc.co.uk/news/technology/