DFD Using a Case Tool: Visible Analysts

Yong Choi

BPA

CSUB

CASE Systems:

Tools used as instruments to make modeling methods, techniques, and procedures operational.

Advantages of Using CASETools during the Analysis Phase:

• More comprehensive and integrated recording of investigation results.

• Uniform recording of analysis for all systems.• Diagram display of analysis results in a form easily

explained to users.• Easy navigation through analysis specifications.• Easily modified entries during the iterative actions

of analysis.

CASE Tool Advantages (Cont)

• CASE tools check for compliance with specific rules for modeling methods, such as balanced I/O checks for DFD levels.

• CASE tools identify inconsistent entries for the same or similar items in the dictionary, such as a logical object defined differently on ERDs and DFDs.

• Facilities for better maintenance of analysis specifications.

CASE Tool Components:

• A&D workbench software to create diagrams to illustrate analysis findings.

• Dictionary software to enter detailed descriptions for analysis diagram elements.

CASE Dictionary Descriptions:

• Preformatted screen data entry and reporting specifications.

• More elaborate narrative explanations of analysis results.

• Reductions in redundancy of analysis specifications.

• Better integrated analysis specifications.• A central repository for analysis documentation.• More easily maintained documentation.

CASE Tools and JADS:

During JADs, analysts use CASE tools and visual aid technologies, such as overhead projector LCD panels, to provide a better way to quickly create DFDs and obtain user feedback regarding the process model.

Use of DFDs in JADS:

• Create DFDs as users speak.

• Review and verify DFDs created during pre-workshop activities or between JAD workshops.

• Make real-time changes made to DFDs as uses speak.

Visible Analyst CASE tool Demonstration