1 ASPP(INPUT DESIGN) Systems Design Input Design

2 ASPP(INPUT DESIGN) Objectives àDiscuss the objectives of systems input design àExplain the differences among data capture, data entry, and data input àExplain the differences between batch and online input àList and describe the different types of data validation checks àDiscuss effective source document design

3 ASPP(INPUT DESIGN) Objectives àDiscuss guidelines for effective screen design àDescribe and design data entry screens, process control screens, graphical user interfaces, and Help screens

4 ASPP(INPUT DESIGN) àInput technology has changed greatly àOutput quality depends on input quality àMain objectives of input design àUser-friendly interface àInput processes that ensure data quality, accuracy and timeliness Introduction

5 ASPP(INPUT DESIGN) àDefinitions àData capture àIdentification and recording of source data àData entry àConversion of source data into a computer- readable form àData input àProcess by which the computer-readable source data enters the information system Input Design Objectives

6 ASPP(INPUT DESIGN) àFour main input design objectives 1. Select input media and methods 2. Develop efficient input procedures 3. Reduce input volume 4. Reduce input errors Input Design Objectives

7 ASPP(INPUT DESIGN) àReduce input errors àFewer errors mean better data quality àEight types of data validation checks 1. Sequence checks 2. Existence checks 3. Data type checks 4. Range checks 5. Reasonableness checks 6. Validity checks 7. Combination checks 8. Batch controls Input Design Objectives

8 ASPP(INPUT DESIGN) Screen Design àEffective screen design guidelines 1. Screens should be attractive and uncluttered 2. Information on a single screen should be displayed in a meaningful, logical order 3. Screen designs should be consistent 4. Messages should be specific, understandable, and professional 5. Messages should remain on the screen for an appropriate period of time

9 ASPP(INPUT DESIGN) Screen Design àEffective screen design guidelines 6. Special effects should be used sparingly 7. Users should receive feedback 8. Screen designs should be documented and approved as soon as possible

10 ASPP(INPUT DESIGN) Screen Design àData entry screen design àGuidelines 1. Restrict user access to screen locations where data is entered 2. Provide a descriptive caption for each field and show the user where to enter the data 3. Show a sample format if one is required 4. Require ending keystroke for every field 5. Do not require users to enter special characters

11 ASPP(INPUT DESIGN)

12 ASPP(INPUT DESIGN) Screen Design àGuidelines 6. Do not require users to type leading zeroes or trailing spaces for alphanumeric fields 7. Do not require users to type trailing zeroes that follow a decimal point 8. Display default values that users can accept 9. Use default values for constant data 10. Display a list of acceptable values for fields with a limited number of valid choices

13 ASPP(INPUT DESIGN) Screen Design àGuidelines 11. Provide a way to leave the data entry screen without inputting the current record 12. Provide an opportunity to confirm the accuracy of input data before entering it 13. Provide a means to move among form fields in a standard, or in another, order 14. Design the screen form to match the layout of the source document

14 ASPP(INPUT DESIGN)

15 ASPP(INPUT DESIGN) Screen Design àGuidelines 15. Allow the operator to add, change, delete, and view records 16. Design a method to allow operators to search for a specific record

16 ASPP(INPUT DESIGN) Screen Design àProcess control screen design àUsers can control system actions with interactive menus and prompts àMenu screens àMenus display a list of user-selectable options

17 ASPP(INPUT DESIGN)

18 ASPP(INPUT DESIGN) Screen Design àProcess control screen design àUsers can control system actions with interactive menus and prompts àMenu screens àMenus display a list of user-selectable options àMenu-driven system uses a hierarchy of main menus and submenus àShortcut key combinations can be used in a menu design

19 ASPP(INPUT DESIGN) Screen Design àProcess control screen design àPrompt screens àUser types a response to a prompt

20 ASPP(INPUT DESIGN)

21 ASPP(INPUT DESIGN) Screen Design àProcess control screen design àPrompt screens àUser types a response to a prompt àResponses can include commands

22 ASPP(INPUT DESIGN)

23 ASPP(INPUT DESIGN) Screen Design àProcess control screen design àPrompt screens àUser types a response to a prompt àResponses can include commands àStructured Query Language (SQL) can be used àQuestion/answer screens can be used àNatural language techniques can be used, similar to Internet search engines

24 ASPP(INPUT DESIGN) Screen Design àProcess control screen design àCombination screens àMenus and prompt screens can be combined effectively

25 ASPP(INPUT DESIGN)

26 ASPP(INPUT DESIGN)

27 ASPP(INPUT DESIGN) Screen Design àGraphical user interfaces àA GUI environment includes process control and data control àA GUI environment is easy to use àCommon features àMenu bar àToolbar àDrop-down menus àDialog, text, and drop-down list boxes àOption (radio) buttons

28 ASPP(INPUT DESIGN)

29 ASPP(INPUT DESIGN)

30 ASPP(INPUT DESIGN)

31 ASPP(INPUT DESIGN) Screen Design àHelp screen design àSeveral methods to obtain Help àClick a command button or toolbar àPress a special key àContext-sensitive Help àProvides Help on the task in progress àUser-selected Help àHypertext àUses links to display additional information on related topics

32 ASPP(INPUT DESIGN)