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8B UI
Design (Output Design
(Report design) (1st, ask yourself several…
8B UI
Design
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Input Design
Quality of input = Quality of output
- Garbage in Garbage out (GIGO)
- Objective of input design: ensure the quality, accuracy and timeliness of input data
- Source document collect input data, incorrect form layout cause insufficient space, confusing instruction
Data Entry screen Guideline
- Restrict user access to where data is entered
- Provide descriptive caption for every field
- Display sample format
- Require an ending keystroke for every field
- Display default value so user can press enter to accept the suggested value
- Provide meaningful error messages
- Provide a way to leave the data entry screen at anytime without entering current record
- Provide a way for user to move among fields on the form
- Allow user to add, change, delete and view records
- Provide a way to search for specific info
Input Masks
- Is a template or pattern that restrict data entry and prevent errors (VD 999 000-000 area code is optional)
Validation Rule
- Sequence, Existence, Data type check
- Range, Limit, Reasonable check
- Validity, Combination check (order input for 30 units has an input discount rate for 100 or more is invalid)
- Batch control (Hash total): do not identify specific error
Technology
Batch input
Perform data entry daily, weekly ...
VD Payroll department collect time cards at month end
Online input
- Advantage: immediate validation
- A popular method is Source Data Automation: combine online data entry & automated data capture using input devices (RFID tags, smartphones)
- SDA fast, accurate, minimize human involvement
- Unless SDA is used, Online input is slower and more expensive than Batch input
Reduce input volume
- Input necessary data only
- Not input data that user can get from system file
- Not input constant data
- Use codes (ch.9)
Security & Control
- Input control: to ensure that input data is correct, complete and secure
- Every piece of info should be traceable back to the input data (audit trail)
- Data security: protect data from loss or damage, store source document for a specific length of time (records retention policy)
- Sensitive data can be encrypted
Add control features
- Menu bar, text box, toggle button
- Drop-down list box, check box
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