Professional and Scientific Staff Management (PSSM) is a unique type of temporary staffing agency. Many organizations today hire highly skilled technical employees on a short-term, temporary basis to assist with special projects or to provide a needed technical skill. PSSM negotiates contracts with its client companies in which it agrees to provide temporary staff in specific job categories for a specified cost. For example, PSSM has a contract with an oil and gas exploration company in which it agrees to supply geologists with at least a master's degree for $5,000 per week. PSSM has contracts with a wide range of companies and can place almost any type of professional or scientific staff members, from computer programmers to geologists to to astrophysicists.

Based on the organization description given above, create (Use Visio or any Modeling Tool).

1. Logical Data Flow Diagram (Level 0).

2. UML Use-Case Diagram.

3. UML Activity Diagram to fill staffing request use-case.