TOPIC 3- Design of solution

Once the problem has been identified, solve the problem using one or more pieces of software (design tools) and a variety of techniques (design techniques) 

Defnition- software used to provide a solution, may require 1 or more design tool 

E.g. website- Web expression, image editing- Photoshop

Most appropiate design tool will depend on:

• tools available
• users experience of using various tools
• whether design tool is compatible with other tools

Definition- the way you use the design tool to solve problem

Data capture- various methods used to enter data into the computer so that it can be processed (e.g. keyboard)

Problems with incorrect data entry:

• incorrect decisions- loss of money
• goods sent to wrong address
• prosecuted under DPA Act 1998- for not keeping data accurate

To prevent processed data containing errors, two methods are used:

• verification- checking data matches with original
  • proof reading- reading whats been typed & comparing with original data source
  • double data entry- two people enter same data into ICT system, if the data is identical- it is accepted (very expensive option)
• validation- checks data is sensible or reasonable (not if data is correct.) Types of validation checks: 
  • data type- number or text
  • format- DD/MM/YYYY
  • presence- data has been entered
  • range- aged between 10-18
  • length- contact number has 11 characters

Types of common errors which occur during data entry:

• Transcription errors- transferring written/spoken data onto a comupter. Issues are:
  • understanding speech- accents
  • poor handwriting
  • typing mistakes

• Transportation errors- accidental swapping of letters (e.g. 'fro' instead of 'for')

Reduce errors by:

• amount of typed input to a minimum- use drop down boxes
• allow the user to type their own deyals
• allow the user to check their details + confirm that they are correct
• use as many verificarion and validation checks as possible

Data types:

• text
• numbers
• images
• sound

Failing to consider users skills- leads to incorrect design

Unaware that the user is:

• Novice- may require online help
• Expert- use shortcut keys
• Visually impaired- need zoom in option/ larger text