FUNCTION POINT ANALYSIS & ESTIMATION

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Presentation transcript:

FUNCTION POINT ANALYSIS & ESTIMATION Gurpreet Singh M.Tech CSE Part Time – 3rd Semester Roll No. 17 & Regd. No. 40800066

Copyright © 2005. The David Consulting Group, Inc.

What is Function Point Analysis (FPA)? It is designed to estimate and measure the time, and thereby the cost, of developing new software applications and maintaining existing software applications. It is also useful in comparing and highlighting opportunities for productivity improvements in software development. It was developed by A.J. Albrecht of the IBM Corporation in the early 1980s. The main other approach used for measuring the size, and therefore the time required, of software project is lines of code (LOC) – which has a number of inherent problems. Copyright © 2005. The David Consulting Group, Inc.

The Function Point Methodology Five key components are identified based on logical user view Inputs Outputs Inquiries Internal Logical Files External Interface Files Input Inquiry Output Internal Logical Files Application External Interface File Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

The Function Point Methodology 14 Optional General Systems Characteristics are evaluated and used to compute a Value Adjustment Factor (VAF) General System Characteristics Data Communication On-Line Update Distributed Data Processing Complex Processing Performance Objectives Reusability Heavily Used Configuration Conversion & Install Ease Transaction Rate Operational Ease On-Line Data Entry Multiple-Site Use End-User Efficiency Facilitate Change The final calculation is based upon the Unadjusted FP count X VAF Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

What is Function Point Analysis (FPA)? These function-point counts are then weighed (multiplied) by their degree of complexity: Simple Average Complex Inputs 2 4 6 Outputs 3 5 7 Files 5 10 15 Inquires 2 4 6 Interfaces 4 7 10 Copyright © 2005. The David Consulting Group, Inc.

What is Function Point Analysis (FPA)? A simple example: inputs 3 simple X 2 = 6 4 average X 4 = 16 1 complex X 6 = 6 outputs 6 average X 5 = 30 2 complex X 7 = 14 files 5 complex X 15 = 75 inquiries 8 average X 4 = 32 interfaces 3 average X 7 = 21 4 complex X 10 = 40 Unadjusted function points 240 Copyright © 2005. The David Consulting Group, Inc.

What is Function Point Analysis (FPA)? Continuing our example . . . Complex internal processing = 3 Code to be reusable = 2 High performance = 4 Multiple sites = 3 Distributed processing = 5 Project adjustment factor = 17 Adjustment calculation: Adjusted FP = Unadjusted FP X [0.65 + (adjustment factor X 0.01)] = 240 X [0.65 + ( 17 X 0.01)] = 240 X [0.82] = 197 Adjusted function points Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

FUNCTION POINT ANALYSIS Project Estimation DEFINITION CAPABILITY ESTIMATE PROJECT SIZE PROJECT COMPLEXITY RISK FACTORS REQUIREMENT discuss estimating, the issue of sizing vs. estimating the issue is that I did more work, not that I delivered more functionality your estimating model has to account for the more work that comes with increased complexity X X Schedule Costs Effort FUNCTION POINT ANALYSIS Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

Copyright © 2005. The David Consulting Group, Inc.

Conclusions Project Management can be successful Requirements can be managed Projects can be sized Performance can be successfully estimated Process improvement can be modeled Measurement can be accomplished Copyright © 2005. The David Consulting Group, Inc.

Thanks Copyright © 2005. The David Consulting Group, Inc.