Systems development Dr. Al Bento University of Baltimore

Systems Life Cycle concept

Systems Analysis

Systems Design Specifications l Output specs (reports) l Input specs (input forms) l Data element dictionary l Systems diagrams l File / DB Design

Relationships of design specs Systems diagrams Data element dictionary Input specs Output specs File / DB design

Systems diagrams

Output specifications t Outputs are the system for the users t Key output questions t who will receive the output t what is the planned use t when and how often is needed t by what media (printed, visual,etc) t Output layout t printer columns, lines t display 80-? columns, 24-? lines t components: headers, footers, fields t drawing the layout

Output layout 1. use a word processor to prepare the layout 2. number the columns as in example below 3. type the headers under these columns 4. determine a format and length to the fields 5. create an example for the field using Xs and 9s 6. to show that it repeats copy one or two times the example New Employee and Termination Report DeptEmp. No.Name Date hired Date Term. Cause xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 99/99/9999/99/99xxx

Input specifications ENTER DO NOT ENTER identification data constant data variable data retrieved data computed data S a l e s E n t r yDate: 06/15/99 Quantity Item Description Unit cost Total cost Sonic Circles Item totals Sales tax 5.99 Grand total Input layout: same as output layout

Systems implementation u Coding u program specs u test data u documentation u System testing u program testing u system testing u Procedures and training u Installation u parallel u pilot