4. Dynamic information sources

Dictionary definitions tell us that the word 'dynamic' is characterised by continuous change, activity or progress. This is a fairly accurate description in terms of a 'dynamic information source'.

A good example of a dynamic information source would be a web site which is updated on a regular basis. Think about the BBC news web site - it is changed throughout the day as news stories happen around the world. The growth of video phones and satellite technology means that news can be reported on whilst it is still happening.

However, you need to be clear that not all web sites are dynamic information sources, some could be classed as static. Although we are constantly adding new worksheets and pages to this web site, the theory mini-web that you are using right now probably won't be updated again for at least another year. That would class it as a static source of information.

Although many web sites are updated regularly there is nothing to guarantee that the information is correct or unbiased. No one polices the internet and basically anyone with access to web creation software and hosting space can create a web site about anything they like. Unless the content is illegal, then it will stay on the web for anyone to view.

Teletext could also be viewed as a dynamic information source. Many people have access to the teletext service via their television. The pages are updated regularly with the latest stock prices, weather forecasts, motorway traffic conditions and even new cooking recipes.

Motoring organisations such as the AA and RAC provide a dynamic information service which can be accessed either via the internet or by mobile phone. You can ring them up and listen to a recorded message telling you about traffic conditions in any part of the country. This will be updated as they receive new information from motorway cameras or from their roadside vehicles who report accidents.

People traveling by air can make use of dynamic information sources at airports. They can see a real-time list of all flights which are due to arrive and depart. Delays and cancellations are displayed as soon as information becomes available.