Software Cost Estimation Techniques

Software Cost Estimation Techniques

• 1.
  SOFTWARE COST ESTIMATION TECHNIQUES Preparedby V.Santhi Assistant Professor Department of Computer Applications Bon Secours College for Women Thanjavur
• 2.
   Software costestimation based on past performance  Historical data used to identify cost factor Methods 1. Top-down 2. Bottom-up Top-Down:  Focuses on system level costs  Computing resources & personnel to develop the system  Costs of Configuration management  Quality assurance  System Integration  Testing  Publications
• 3.
  Bottom –Up:  Estimatesthe cost to develop each module or subsystem.  Combine overall cost. Techniques: 1. Expert Judgment 2. Delphi Cost Estimation 3. Work Breakdown Structure 4. COCOMO Model
• 4.
  EXPERT JUDGMENT  Mostwidely used estimation technique  Top-down estimation technique Ex: Process Control System 10 months & $ 1 million cost New System  25% more activities  increase our time and cost  Same computer and external sensing/controlling devices & same people available to develop the new system  Reduce our estimate by 20%
• 5.
  Advantages:  Experience  Expertconfident that the project is similar to previous one.  Group of experts prepare a consensus estimate.  Minimize individual oversights.
• 6.
  Disadvantages:  Interpersonal groupdynamics may have on individuals in the group.  Political consideration  Dominance of an overly assertive group member.
• 7.
  DELPHI COST ESTIMATION Developed by Rand Corporation in 1948  Without introducing the adverse side effects of group meetings 1. A coordinator provides each estimator with the System Definition document 2. Estimators study the definition and complete their estimate anonymously. Ask questions of the coordinator. 3. Coordinator prepares and distributes a summary of the estimators response
• 8.
  4. Estimators completeanother estimate, again anonymously using the results from the previous estimate. 5. The process is iterated for as many rounds as required. No group discussion is allowed during the entire process
• 9.
  VARIATION OF DELPHICOST ESTIMATION 1. Coordinator provides each estimator with a system Definition and an estimation form 2. Coordinator calls a group meeting and discuss the estimation issues with each other. 3. Estimators complete their estimates anonymously 4. The coordinator prepares a summary of estimates, but does not record any rationale. 5. The coordinator calls a group meeting to focus on issues where the estimation vary widely 6. Estimators complete another estimate, again anonymously. The process repeated so many
• 10.
  WORK BREAKDOWN STRUCTURE Bottom-up estimation  Hierarchical chart  individual parts of the system  WBS  product hierarchy / process hierarchy Product Hierarchy  Identifies the product components and how its interconnected. Process Hierarchy  Identifies the work activities and the relationship among those activities.
• 11.
  PRODUCT WBS
• 12.
  PROCESS WBS