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4.2 INPUT & OUTPUT DESIGN - Coggle Diagram
4.2 INPUT & OUTPUT DESIGN
Input Design & Technology Issues
quality of the output = quality of the input
garbage in, garbage out (GIGO)
Objectives of Input Design
to ensure the quality,accuary and timeliness of input data
Guidelines For Data Entry Screen Design
Data Entry Screens
Guidelines
1.Restrict user access to screen locations where data is entered
2.Provide a descriptive caption for every field, and show the user where to enter the data and the required or maximum field size
3.Display a sample format if a user must enter values in a field in a specific format - separator
4.Require an ending keystroke for every field
5.Do not require users to type leading zeroes for numeric fields
6.Do not require users to type trailing zeroes for numbers that include decimals
7.Display default values so operators can press the ENTER key to accept the suggested value
8.Use a default value when a field value will be constant for successive records or throughout the data entry session
9.Display a list of acceptable values for fields, and provide meaningful error messages
10.Provide a way to leave the data entry screen at any time without entering the current record
11.Provide users with an opportunity to confirm the accuracy of input data before entering it
12.Provide a means for users to move among fields on the form
13.Design the screen form layout to match the layout of the source document
14.Allow users to add, change, delete, and view records
15.Provide a method to allow users to search for specific informatio
n
Input & Data Entry Method
a.batch inpu
t
data entry is performed on a specified time schedule [ daily, weekly, monthly, or longer ]
b.Online Input
batch input - used in specific situations
Input Mask & Validation Rules
1.Sequence check
2.Existence check
3.Data type check
4.Range check
5.Reasonableness check
7.Combination check
8.Batch controls
6.Validity check