INFO 2 Revision Guide

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AQA AS ICT INFO2
Revision Guide (2008/10)
Living in the Digital World
DAVID J ASTALL
[email protected]
POD 2845
www.zigzageducation.co.uk
Photocopiable/digital resources may only be copied by the purchasing institution on a single site and for their own use

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Contents
Introduction.......................................................................................................................................................................3
Revision Checklist .............................................................................................................................................................3
2.1 ­ An ICT system and its components ........................................................................................................................3
What is ICT? .................................................................................................................................................................3
What is a system? ..........................................................................................................................................................3
What is a system life cycle? ..........................................................................................................................................3
What is the difference between a system and an ICT system? ......................................................................................3
What is an ICT system composed of? ...........................................................................................................................3
What is Data? ................................................................................................................................................................3
What is Information?.....................................................................................................................................................3
2.3 ­ People and ICT systems...........................................................................................................................................3
ICT systems are designed for and used by people and are commissioned for a purpose.....................................................3
What are the characteristics of users?............................................................................................................................…read more

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Introduction
In this resource the main elements of each unit, according to the AQA AS Level ICT specification (2008) INFO1,
are incorporated and divided into sections. The sections are numbered 2.1-2.9, but should you require them, the
full AQA unit references from the specifications can be found listed on the following page.
This resource is designed to allow the learner to revise from one section at a time, while on the move carrying
minimal paperwork.…read more

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Revision Checklist
AQA Unit Revised Topic
3.2.1 An ICT system and its components
3.2.2 Data and Information
3.2.3 People and ICT systems
3.2.4 Transfer of data in ICT systems
3.2.5 Safety and Security of ICT systems
3.2.6 Backup and recovery
3.2.7 What ICT can provide
3.2.8 Factors affecting the use of ICT
3.2.…read more

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­ An ICT system and its components
This section looks at what ICT is; the difference between a system and an ICT system and finally looks at the
components of ICT system.
What is ICT?
ICT is the use of technology for the input of data, storage, processing to change the data into information,
transfer of data to other devices and the output of information.…read more

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­ Data and Information
This section distinguishes the difference between Data and Information. The main purpose of using ICT is to
process data as efficiently as possible to produce useful information.
What is Data?
Raw facts, figures, events or transactions; these are only meaningful when put into context (e.g. 5, 12, 19 are
unprocessed numbers, because they have not been put into a context).
How data can arise
There are two sources of data: DIRECT or INDIRECT:
· Direct: Collected for a specific purpose, e.g.…read more

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What is Information?
Data that has been processed into a form that is meaningful and useful. Information is required in the day-to-day
running of a business and to support decision-making. Information has context and its meaning is determined by
that context (e.g. when 5, 12, 19 ­ a doctor's patients' ages ­ are entered into a spreadsheet, some functions are
applied, and the names of patients and their vaccinations to date are displayed).…read more

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­ People and ICT systems
This section of specification looks at the reasons why ICT systems are commissioned; it also looks at the
requirements and characteristics of users. The section looks at how humans interact with computers and what
makes a good HCI. Finally this section looks at the qualities required for different jobs using ICT.…read more

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Designing a new interface
You need to consider the following:
1. Who will use the system? An IT professional or a novice user?
2. What age is the user? A child or an adult?
3. What task does the user wish to achieve?
4. Is the task repetitive?
5. Does the user require any specific knowledge?
6. Do tasks vary greatly from one occasion to the next?
7. What environment is the user operating in? Hazardous and noisy or calm and quiet?
8.…read more

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Different types of Interface
Command Line Interface
Typing in known commands to activate a program e.g. DIR for directory search in MS-DOS. This requires the
user to be an expert in the use of programming, as each command must not only be learnt but also understood.
Incorrectly entered commands could affect the running of the ICT system. An example of this type of interface is
the setting up of the computer.…read more

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