1. COTS Acquisition COTS Acquisition Impact Analysis Lianne Versluis

2. Overview of the topic COTS Acquisition Impact Analysis Proposed by Mark Feblowitz and Sol Greenspan, 1998 Analyzes the impacts of the acquisition of a COTS product

3. What is COTS? COTS stands for Commercial Off-the- Shelf Also called package systems or off- the-shelf components Term originates from the requirements engineering field

4. COTS: a definition Software that is: 1.sold, leased, or licensed to the general public, 2.offered by a vendor trying to profit from it, 3.supported and evolved by the vendor, who retains the intellectual property rights, 4.available in multiple, identical copies 5.used without source code modification.

5. COTS product characteristics it exists à priori it is available to general public it is sold, leased or licensed

6. Benefits & Drawbacks Benefits: reduced time-to- market Money-saving by not building in- house competition between vendors turns always to the customer profit. Drawbacks: non-control over updates and maintenance risk of dependence on a vendor difficult integration

7. Phases of Impact Analysis

8. Other selection methods Several other selection evaluation methods exist: for example, the PORE, OTSO, CAP, and STACE methods

9. Positioning Criteria-based: OTSO and STACE Scenario-based: Impact Analysis Goal-oriented: Alves & Finkelstein Metrics-oriented: CAP Mixed: PORE

10. PDD

11. Example: baseline scenario TitleCitizen returns the borrowed books Goal Obtain the borrowed books Context Citizen has a Library Card Participants Librarian Citizen Resources Books Library Card Library Database Narrative 1. Citizen calls in (with the borrowed books) at the Librarian 2. Librarian asks for Library Card 3. Citizen gives Library Card 4. Librarian checks Library Card 5. Librarian gives back Library Card 6. Librarian obtains the borrowed books

12. COTS scenario TitleCitizen returns the borrowed books Goal Obtain the borrowed books Context Citizen has a Library Card Participants Citizen Librarian Resources Books Library Card Library Database Library System Narrative 1. Citizen calls in (with the borrowed books) at the Library System 2. Citizen scans his/her Library Card 3. Citizen returns the books Modified responsibilities Added resource Three steps instead of 6

13. Template COTS Candidate: Candidate X Impact Type Resource impact Participants impact Information flow impact Responsibility impact Is there an impact? Y/N Removed or added? Removed/ Added Removed/ Added Removed/ Added Removed/ Added Gravity 1 to 5 Remarks: Choose COTS Candidate: Y/N

14. Questions?