1. Input, Output and Processing.

2. What data needs to be input into the system? Identify the sources – i.e. where does the data come from? What is the volume of input data (high, medium, low) ProductsCataloguesMedium Orders Customers Suppliers

3. How is the data currently collected? How is the data is currently recorded? Identify the input documents currently in use. Determine, frequency of addition/deletion of records Catalogues are sent from suppliers CataloguesUpdated once a year, when new catalogues are released.

4. Complete page 85.

5. What data needs to be outputted? In which format is it currently outputted? Product InformationSpreadsheet / List Customer InformationList Supplier InformationList Order InformationOrder form - kept in a folder

6. Complete page 86.

7. Input Data Hardware/Software Input customer information Keyboard / Mouse Processing Hardware/Software Save the customer information Hard Drive, Processor, motherboard Output Hardware/Software Output the customer information Monitor

8. Complete page 87.

9. Summary So what input, output and processing devices will we need?

10. Complete page 89, part 1.

11. What is Data Validation? Data validation restricts the user to the data they can enter. It is an automatic computer check to ensure that the data entered is sensible and reasonable.

12. Data Type Check This checks that the data being entered is the same type as the data type specified for the field.

13. Range Check This checks that the data being entered is within a specified range. Example: quantity has to be between 1 and 5

14. Length Check This checks that the data being entered is within a certain number of characters. Example: the driving license number does not exceed 16 characters.

15. Consistency Check Checks to see if the data in one field is consistent with the data in another field. Example: if gender is M then there should not be a Miss in the title field.

16. Presence Check This checks that the data is present and not left empty in the compulsory fields Example: the name and date of birth fields are not left blank in a pupil database

17. Format Check Format checks are performed on codes to make sure that they conform to the correct combinations of characters. Example: the order code must be entered in the format A0000 a capital letter followed by 4 numbers. DOB is in the format DD/MM/YY

18. Boolean Check Ensures that the data is either True or False, Yes, or No Example: Has some paid for an order.

19. Check Digit If a barcode scanner doesn’t work how else can you enter it into a computer system?

20. Check Digit A barcode has a check digit. This is worked out using a maths formula on the other numbers

21. Complete page 90-91

22. What is Data Verification? Data Verification ensures that the data being entered is accurate. THIS IS NOT DONE BY A COMPUTER!!!!

23. Check 1: Double Entry When you are entering a new password, what do you have to do?

24. Check 1: Double Entry When you are entering a new password, what do you have to do? Enter the password twice This is called double entry.

25. Check 2: Visual Check This involves you checking what you have entered is correct.

26. Complete page 91-92

27. Field Name Data Type Field Size Range CheckPresence Check Default Value Format check Other Validation Check Student Name Text50NoYesNo

28. Complete page 96 just one table, ignore the others.

29. Complete page 100

30. Complete page 101