1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO/IEC 29881:2010 Incorporating July 2011 corrigdendum Information technology Systems and software engineering FiSMA 1.1 functional size measurement methodBS ISO/IEC 29881
2、:2010 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO/IEC 29881:2010. The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e I S T / 1 5 , S o f t w a r e a n d s y s t e m s engineering. A list of organizations represent
3、ed on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 76283 3 ICS 35.080 Compliance with a British Standard cannot confer im
4、munity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2011. Amendments issued since publication Date T e x t a f f e c t e d 31 July 2011 Correction to supersession BS ISO/IEC 29881:2010Reference number IS
5、O/IEC 29881:2010(E) ISO/IEC 2010INTERNATIONAL STANDARD ISO/IEC 29881 Second edition 2010-08-15 Information technology Systems and software engineering FiSMA 1.1 functional size measurement method Technologies de linformation Ingnierie des systmes et du logiciel Mthode de mesure de la taille fonction
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11、 rights reservedBS ISO/IEC 29881:2010 ISO/IEC 29881:2010(E) ISO/IEC 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 1.1 Field of application for FiSMA 1.11 1.2 Limitations of FiSMA 1.1.1 1.3 Scope of FSM for FiSMA 1.1.1 2 Normative references1 3 Terms and definitions .2
12、 4 BFC Classes and BFC Types of FiSMA 1.1 3 4.1 Interactive end-user navigation and query services (q)4 4.2 Interactive end-user input services (i).5 4.3 Non-interactive end-user output services (o).6 4.4 Interface services to other applications (t).6 4.5 Interface services from other applications (
13、f) 6 4.6 Data storage services (d)7 4.7 Algorithmic and manipulation services (a).8 5 FiSMA 1.1 Measurement process 8 6 Counting rules for each BFC type class .10 6.1 Interactive end-user navigation and query BFCs (q)10 6.2 Interactive end-user input BFCs (i).10 6.3 Non-interactive end-user output B
14、FCs (o).11 6.4 Interface BFCs to other applications (t) .11 6.5 Interface BFCs from other applications (f) 11 6.6 Data storage services (d)12 6.7 Algorithmic and manipulation services (a).12 7 Functional size measurement unit 12 8 Calculation of the FiSMA 1.1 functional size of a piece of software12
15、 9 Measurement reporting.13 10 Convertibility from FiSMA 1.1 to other FSM Methods .13 Annex A (informative) Glossary of terms relevant to FiSMA 1.114 Bibliography16 BS ISO/IEC 29881:2010 ISO/IEC 29881:2010(E) iv ISO/IEC 2010 All rights reservedForeword ISO (the International Organization for Standar
16、dization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organizatio
17、n to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, IS
18、O and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted
19、 by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of pa
20、tent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 29881 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 7, Software and systems engineering. This second edition cancels and replaces the first
21、 edition (ISO/IEC 29881:2008), of which it constitutes a minor revision. BS ISO/IEC 29881:2010 ISO/IEC 29881:2010(E) ISO/IEC 2010 All rights reserved vIntroduction Functional size is an essential measure for comparisons of software development activities and development alternatives. Besides its use
22、s in estimating and productivity analysis, functional size has proven to be useful in project planning, tracking, control and contracting. Because Functional Size Measurement (FSM) works best when there is a complete list of functional user requirements and services, it makes scope management and ch
23、ange management effective, reliable and relatively easy to understand even to the end-user. The correctness of counting parameters and thus the usefulness of an FSM method can be evaluated based on the correlation between functional size and effort under similar environmental and technical circumsta
24、nces and quality requirements. This kind of evaluation may indicate a need to justify the counting parameters used to derive functional size. FiSMA Functional Size Measurement Method Version 1.1 (referred to throughout this International Standard as simply FiSMA 1.1) is a general, parameterized FSM
25、method for all types of software. It was developed by a working group of Finnish Software Measurement Association (FiSMA), to replace the previous FSM method Experience 2.0 Function Point Analysis (FPA), which has been applied largely in Finland since 1997. More than 600 software development project
26、s were measured using that method between 1997 and 2003. The current values of constraints used in FiSMA 1.1 are derived from its predecessor Experience 2.0 FPA, and were confirmed statistically to be correct. They may be updated in future releases of the FiSMA FSM Method if the data collection and
27、analysis demonstrate the need to do so. For readers who are unfamiliar with FSM terminology, a review of terms is provided in Annex A, together with definitions and explanations of the most important terms. Results from FiSMA 1.1 and Experience 2.0 FPA are largely convertible with each other, if the
28、 source data has been collected at the recommended detail level. FiSMA 1.1 is based purely on Functional User Requirements (FUR). User requirements can be thought of as functional (what the software does) and non-functional (how the software must perform, including quality requirements). For FiSMA 1
29、.1, the Functional User Requirements are the object of measurement. While some FSM methods are process oriented, FiSMA 1.1 is service oriented. Process-oriented methods require the identification of all functional processes supported by the piece of software. In contrast, service-oriented methods, s
30、uch as FiSMA 1.1, require identification of all different services provided by the piece of software. The FiSMA 1.1 relationship chain between users and the developed piece of software involves user needs and services as presented in Figure 1. BS ISO/IEC 29881:2010 ISO/IEC 29881:2010(E) vi ISO/IEC 2
31、010 All rights reservedFigure 1 Links between user and a piece of software While each audience may have its own reasons for size measurement, the typical user viewpoint is to estimate the effort for a software project. Other important industry uses of FSM are presented in Figure 2. Figure 2 Common p
32、urposes of Functional Size Measurement BS ISO/IEC 29881:2010 INTERNATIONAL STANDARD ISO/IEC 29881:2010(E) ISO/IEC 2010 All rights reserved 1Information technology Systems and software engineering FiSMA 1.1 functional size measurement method 1 Scope This International Standard specifies the set of de
33、finitions, conventions and activities of FiSMA 1.1. The target audience of this International Standard includes anyone who applies FiSMA 1.1 to measure the functional size of a piece of software. FiSMA 1.1 is intended for use by those persons associated with the acquisition, development, use, suppor
34、t, maintenance, and audit of software. FiSMA 1.1 is based on an assessment of the Functional User Requirements. It measures the functional size of a piece of software from the perspective of the users. 1.1 Field of application for FiSMA 1.1 FiSMA 1.1 is applicable to measure all software in any func
35、tional domain. 1.2 Limitations of FiSMA 1.1 FiSMA 1.1 has no limitations related to the type or quality of software to be measured. 1.3 Scope of FSM for FiSMA 1.1 The scope of the Functional Size Measurement for FiSMA 1.1 is determined by the purpose for measuring the software. When using FiSMA 1.1,
36、 the set of FUR to be included depends on the purpose of the count and thus may include the FUR for one piece of software or a set of pieces of software. Each piece of software within the scope is measured separately and if more than one piece of software is included within a project, all of the fun
37、ctional sizes may be added together. The scope of the FSM instance is always a subset of the overall user requirements and includes purely the Functional User Requirements, in other words, “what” in terms of services and tasks that the software must perform. The purpose of the FSM determines which F
38、UR will be included in the FSM instance. NOTE 1 For example, if the purpose of the FSM is to determine the size of the first release of a piece of software, then the size using FiSMA 1.1 will include only the FUR for the first release of the software. NOTE 2 As another example, if the purpose of the
39、 FSM is to determine the supported size of an installed package, only those functional user requirements in the package that are used by the organization will be included in the instance of the FSM. NOTE 3 FiSMA 1.1 only measures the size of the Functional User Requirements included within the scope
40、 as outlined above. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IE
41、C 14143-1:2007, Information technology Software measurement Functional size measurement Part 1: Definition of concepts BS ISO/IEC 29881:2010 ISO/IEC 29881:2010(E) 2 ISO/IEC 2010 All rights reserved3 Terms and definitions For the purposes of this document, the following terms and definitions apply. W
42、henever a term is already defined by ISO/IEC, such as “Functional Size Measurement”, the ISO definition has been adopted for this method. NOTE For users who are unfamiliar with Functional Size Measurement terminology, and to increase the usability of this International Standard, a review of terms is
43、 provided in Annex A, together with definitions and explanations of the most important terms. 3.1 BFC class defined group of BFC types 3.2 boundary conceptual interface between the software under study and its users ISO/IEC 14143-1:2007, definition 3.3 NOTE The boundary of a piece of software to be
44、sized using FiSMA 1.1 conceptually separates the piece and the environment in which it operates, perceived from the external user perspective. The boundary provides the measurement analyst(s) with a solid delimiter to distinguish, without ambiguity, what is included inside the measured software from
45、 what is part of the measured softwares operating environment. 3.3 data element unique, user-recognizable, non-repeated field in a BFC NOTE 1 A data element can be a character string, or a digital or graphical element in a BFC. NOTE 2 The number of data elements is always greater than 0. 3.4 data st
46、ore organized and persistent collection of data and information that allows for its retrieval ISO/IEC 15939:2007 3.5 end-user any person that communicates or interacts with the software at any time 3.6 functional services base functional components (BFC) defined by FiSMA 1.1 3.7 operation arithmetic
47、 or logical operation performed in an algorithmic and manipulation BFC NOTE The number of operations is always greater than 0. 3.8 reading reference data storage entity or record, or interface record from another software or system containing data retrieved in a BFC NOTE The number of reading refere
48、nces is greater than or equal to 0 for all BFC types where it is applicable. BS ISO/IEC 29881:2010 ISO/IEC 29881:2010(E) ISO/IEC 2010 All rights reserved 33.9 user any person or thing that communicates or interacts with the software at any time 3.10 writing reference data storage entity or other rec
49、ord, or interface record to another software or system to which data is written in a BFC NOTE The number of writing references is greater than 0 with all BFC types where it is applicable. 4 BFC Classes and BFC Types of FiSMA 1.1 FiSMA 1.1 identifies seven distinct BFC classes: Interactive end-user navigation and query services (q) Interactive end-user input services (i) Non-interactive end-user output services (o) Interface services to other applications (t) Interface services from other applications
