GB/T 42449-2023Systems and software engineering - Functional size measurement - IFPUG method (English PDF)

Foreword

This document was issued on 17 March 2023 by the State Administration for Market Regulation; Standardization Administration of the PRC and takes effect on 1 October 2023.

It is a GB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 35.080, Chinese classification L77.

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"

drafting.

This document is equivalent to ISO /IEC 20926.2009 "Software and System Engineering Software Measurement IFPUG Functional Scale Measurement Method

2009".

The following minimal editorial changes have been made to this document.

--- In order to coordinate with the existing standard documents, the name of the standard is changed to "IFPUG Method for Measuring Functional Scale of System and Software Engineering";

--- Added Appendix NA (informative) application cases of this document.

Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.

This document is proposed and managed by the National Information Technology Standardization Technical Committee (SAC/TC28).

This document is drafted by. China Institute of Electronic Technology Standardization, Shenzhen Saixi Information Technology Co., Ltd., Beijing Software Cost Evaluation Technology

Technology Innovation Alliance, Beijing High Quality System Technology Co., Ltd., National Application Software Product Quality Inspection and Testing Center, Dopp Information Technology Co., Ltd.

Division, Guangxi Dayi Technology Co., Ltd., Shandong Provincial Computing Center (National Supercomputing Jinan Center), Shanghai Software Industry Association, China Aerospace

Systems Science and Engineering Research Institute, Shandong Shanke Digital Economy Research Institute Co., Ltd., Chongqing Little Apple Technology Co., Ltd., PetroChina Tian

General Planning Institute of Natural Gas Co., Ltd., Zhejiang Dijie Software Technology Co., Ltd., Shanghai Baosight Software Co., Ltd., Yunnan Power Grid Co., Ltd.

Responsible Company Information Center, CISDI Chongqing Information Technology Co., Ltd., Zhejiang Electronic Information Product Inspection and Research Institute, Shanghai Tongsiting Soft

Software Technology Co., Ltd., Shanghai Computer Software Technology Development Center, Beijing Huayu Information Technology Co., Ltd., Beijing Zhongji Datalink Technology Co., Ltd.

Company, Guangdong Science and Technology Basic Conditions Platform Center, Suzhou Insight Cloud Information Technology Co., Ltd., Shanghai Xuansi Intelligent Technology Co., Ltd., Beijing

Credible Huatai Information Technology Co., Ltd., Chengdu Sifang Weiye Software Co., Ltd., Beijing Software and Information Service Exchange Co., Ltd.

The main drafters of this document. Zhang Yangyang, Li Wenpeng, Yan Liang, Su Wei, Yang Genxing, Wang Haiqing, Lou Li, Han Qingliang, Zhou Mingle, Li Gang, He Yuliang,

Li Lingfan, Liu Hualin, Wu Dilong, Liao Yiyu, Xu Zongmin, Li Wang, Ji Yongwei, Dong Guantao, Kang Shuo, Zhang Yuanyuan, Mao Lingyan, Zhang Yi, Che Jiangtao,

Wang Rui, Hu Yun, Hao Lin, Xu Minxia, Lu Xue, Hu Yuhui, Deng Rijie, Feng Kuan, Wei Zhiwei, Dai Hanling, Fude Peng, Yu Yingli, Han Delong, Yu Jian,

Zhuangzhuang, Yao Baojing, Han Mingjun, Ma Wen, Lu Renyuan, Yang Xin, Gong Jiayu, Yin Ronghui, Zhao Ming, Huang Linfang, Liu Lin, Ouyang Shusheng, Du Jun, Han Yong,

Liu Fen, Liu Yongchao.

Introduction

In order to effectively support the landing and implementation of GB/T 18491 "Information Technology Software Measurement Function Scale Measurement", define a

The functional size measurement method of GB/T 18491 is formulated in this document.

Since the mid-1970s, the method of measuring the functional size of software in function points has grown from a few interest groups to

For an impressive global organization. Alan Albrecht was the first to publicly publish a measure of software size

People, this method is called the function point counting method. With the increase of the use of function points, the application and use of this method are becoming more and more extensive. since

Albrecht's software function classification method. The functional size measurement methodology defined in this document facilitates a consistent solution to functional size measurements.

release. The measurement method of the IFPUG functional scale is also called the function point counting method, and the unit of its functional scale is called the function point.

Organizations can apply this document to measure the size of software products for.

--- Support quality and productivity analysis;

--- Estimate the cost and resources required for software development, enhancement and maintenance;

--- Provide a normalization factor for software comparison;

--- Determine the size of the purchased application package by grading all the functions contained in the application package;

--- Help users determine the benefits of an application package to their organization by determining the functional size specific to their needs.

Function point analysis measures software by quantifying the tasks and services (i.e., functions) it provides to users based primarily on its logical design. Function

The purpose of point analysis is to measure.

--- Functions requested and received by users implemented in the software;

--- Does not depend on the implementation of its technology to measure the scale of software development and maintenance.

The process of function point analysis is.

--- Simple enough to minimize the cost of the measurement process;

---Measurements are consistent across projects and organizations.

System and software engineering functional size measurement

IFPUG method

1 Scope

GB/T 42449-2023 covers the IFPUG method of functional size measurement — the definitions, the rules and the procedures for expressing the size of software in function points, counted from the functions the software delivers to its users rather than from the way it was built. The document is equivalent to ISO/IEC 20926:2009 and gives the framework of GB/T 18491 a measurement method that can actually be applied. Most of its weight sits in two clauses: the terms and definitions, which carry the counting concepts the method rests on, and the measurement process, which sets out the steps of a count in the order they are performed, with a short abbreviations clause between them. The reason for such detailed rules is repeatability. Size expressed in lines of code says as much about the language and the programmer as about the work done, so it cannot be used to compare projects, price a contract or track productivity across a portfolio. A function point count is worth only as much as the consistency of the rules behind it, which is why the definitions and the procedure are fixed here instead of being left to the judgement of whoever is counting. Used by measurement practitioners, software suppliers estimating or pricing work, and the bodies that audit or benchmark them.

1.1 Purpose

This document specifies the definitions, rules and procedures for the IFPUG Functional Size Measurement (FSM) method.

1.2 Consistency

This document follows the provisions in ISO /IEC 14143-1.2007.

1.3 Applicability

This document applies to all functional areas.

Note. The IFPUG organization continues to publish white papers to provide guidance for evolving environments and fields.

This document is fully compatible with previous versions of the IFPUG scale measurement method.

IFPUG function point analysts have identified different delivery rates (time to deliver a single function point) that differ from those in

related to applications built in functional areas calibrated for different project sizes and software complexities.

1.4 Users

This document is intended for any user who needs to measure the size of a function. For experienced users, this document provides a useful reference.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

this document.

ISO /IEC 14143-1.2007 Information Technology Software Measurement Functional Size Measurement Part 1.Concept Definition

of concepts)

Note. GB/T 18491.1-2001 Information Technology Software Measurement Functional Scale Measurement Part 1.Concept Definition (ISO /IEC 14143-1.

1998, IDT)

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1

Adaptive maintenance adaptive maintenance

The modification of a delivered software product to adapt to a changed or changing environment.

Note. Adaptive maintenance provides the necessary improvements to adapt to changes in the environment in which the software product must run. In order to keep up with the changing environment

Synchronization should make the corresponding changes. For example, the operating system may be upgraded and certain changes may be made to accommodate the new operating system.

[Source. ISO /IEC 14764.2007, 3.1]