2. Some Sources
• Ahmad K. Shuja, Jochen Krebs. IBM Rational Unified
Process Reference and Certification Guide—Solution
Designer. IBM Press, 2008.
• Bellagio, David E. Milligan, Tom J. Software
Configuration Management Strategies and IBM®
Rational® ClearCase® Second Edition A Practical
Introduction. Addison Wesley Professional, 2005.
• Aiello, Bob. Sachs, Leslie. Configuration Management
Best Practices. Addison Wesley Professional, 2011.
• Kemper, Chris; Oxley, Ian. Foundation Version Control for
web developers. Friendsfot Apress, 2012.
• Londoño & Lozano, EAFIT University, 2010.
4. Before…
We must remember always…
Software is bounded only by the
limits of the human imagination.
Uncontrolled and undirected,
imagination can quickly give rise
to nightmare
5. Definition
Software Configuration Management (SCM) is a
software-engineering discipline comprising the tools
and techniques (processes or methodology) that a
company uses to manage change to its software
assets.
7. IEEE Standard 828 (1983, 1998, 2005,
2008, 2012).
http://standards.ieee.org/findstds/standard/828-2012.html
The minimum required contents of a Software
Configuration Management Plan (SCMP)
are established, and the specific activities to
be addressed and their requirements for any
portion of a software product's life cycle are
defined.
8. IEEE Standard 828.
SCM constitutes a good engineering
practice for all software projects, whether
phased development, rapid prototyping, or
ongoing maintenance.
It enhances the reliability and quality of
software by (next..)
9. IEEE Standard 828
1. Providing structure for identifying and controlling
documentation, code, interfaces, and databases
to support all life-cycle phases
2. Supporting a chosen development/maintenance
methodology that fits the requirements,
standards, policies, organization, and
management philosophy
3. Producing management and product information
concerning the status of baselines, change
control, tests, releases, audits, etc
10. According with SWEBOK 2014
http://www.computer.org/portal/web/swebok Chapter 6
Configuration management (CM) is the discipline
of identifying the configuration of a system at
distinct points in time for the purpose of
systematically controlling changes to the
configuration, and maintaining the integrity and
traceability of the configuration throughout the
system life cycle.
11. Come back to IEEE 828
http://www.computer.org/portal/web/swebok Chapter 6
A discipline applying technical and administrative
direction and surveillance to: identify and
document the functional and physical
characteristics of a configuration item, control
changes to those characteristics, record and
report change processing and implementation
status, and verify compliance with specified
requirements
13. IEEE Standard 828.
Configuration:
• The configuration of a system is the functional
and physical characteristics of hardware or
software as set forth in technical
documentation or achieved in a product.
• It can also be thought of as a collection of
specific versions of hardware, firmware, or
software items combined according to specific
build procedures to serve a particular purpose
14. Some CM standards and models
• IEEE 828
• IEEE 1704 (1997)
• IEEE 12207 Software Life Cycle Processes
• CMMI
• NTC-ISO-10007 como Administración de la
calidad – Directrices para la Administración de la
Configuración…
15. Configuration Item
Any selected artifact (file) or set of selected artifact to
manage its configuration and be treated as a single entity.
Example:
code, executable objects, scripts, documents, etc.
An aggregation of hardware, software or both kinds of
components, designated for configuration management
and treated as one entity in the management process
(IEEE Std 610.12).
An aggregation of work products selected for configuration
management and treated as a single entity in the
process(CMMI).
16. Software Configuration:
• Physic and functional features of the software
exposed in a technical documentation or
reached in a product (IEEE)
• Set of controlled configuration items, at a given
moment of time (CMMI)
17. Versions and Variants
One version is an instance of a configuration item
or a system that differs in some form of another
instance.
Predecessor - Successor
Record
The variants are equivalent versions in
functionality but differ in hardware or software
environment
20. • Build: Combination of components of a system in
executable components in a target configuration.
• Release: More than just the executable code, it
includes installation files, data, settings, release notes
and manuals. They are created for external use
• Delta: it is used to recover the history of an item.
Difference between the new version and the previous.
21. Baseline
Specification or product that has been formally reviewed
and approved, provides a basis for future development and can only
be changed through a formal change control.
IN OUT
Controlled
Enviroments
LB 0.0.1
Power
Factor
Correction
22. Baselines are used to track
the software configuration
at a discrete point in time
23. About Baselines – RUP
A baseline is a 'snapshot' in time of one version of each work
product in the project repository. It provides an official
standard on which subsequent work is to be based,
and to which only authorized changes can be made.
After an initial baseline is established every subsequent
change to a baseline is recorded as a delta until the next
baseline is set.
The three main reasons for creating baselines are
reproducibility, traceability, and reporting.
25. SCM Best Practices
• Identify and store artifacts in a secure repository.
• Control and audit changes to artifacts.
• Organize versioned artifacts into versioned components.
• Organize versioned components and subsystems into
versioned subsystems.
• Create baselines at project milestones.
• Record and track requests for change.
26. SCM Best Practices
• Organize and integrate consistent sets of versions using
activities.
• Maintain stable and consistent workspaces.
• Support concurrent changes to artifacts and components.
• Integrate early and often.
• Ensure reproducibility of software builds.
27. Be Careful
SCM component is a set of related files
and directories that are versioned,
shared, built, and baselined as a
single unit
¿?
29. Be Careful
Change request management involves tracking
requests for changes to a software system.
These requests can result from defects found
by a testing organization, defects reported by
customers, enhancement requests from the
field or customers, or new ideas produced
internally.
30. SCM Tools
• SCM tools are software tools that automate and facilitate
the application of the SCM best practices.
• It is unrealistic to try to maintain effective SCM without an
SCM tool.
• The goal of successful SCM is to allow as much change as
possible while still maintaining control of the software.
SCM tools help automate tedious, manual, and error-prone
pieces of the SCM process, and can ensure that your
project can support all of the SCM best practices.
32. SCM Tools Examples (web–Collaborative!)
• GitHub
• GoogleCode
• Gforge
• Jazz
• Microsoft Team Foundation Server
• …
33. SCM Tools Basic Functions
• To maintain a library or repository of files
• To create and store multiple versions of files
• To provide a mechanism for locking (to enforce
serialized change to any given file)
• To identify collections of file versions
• To extract/retrieve versions of files from the
repository
35. SCM Process
• A process defines the steps by which you perform a specific
task or set of tasks. An SCM process is the way SCM is
performed on your project specifically, how an SCM tool is
applied to accomplish a set of tasks.
• A key mistake most people make is to assume that an SCM
tool will, in and of itself, solve their SCM problems or support
their SCM requirements. How you apply the SCM tool to
your development environment is called the usage
model, or SCM process. It is this model or process that will
in part determine how successfully you address your SCM
issues.
36. Unified Change Management
• is a software-configuration management process for software
development that spans the development life cycle,
managing change to requirements, design models,
documentation, components, test cases, and source code
• Fundamental to UCM is the unification of the activities
used to plan and track project progress with the artifacts
being changed
• Implementation of the UCM model is realized by both process
and tools
37. UCM Process
Source: Chapter 3 - Bellagio, David E. Milligan, Tom J. Software Configuration
Management Strategies and IBM® Rational® ClearCase® Second Edition A
Practical Introduction. Addison Wesley Professional, 2005
38. Unified Change Management
UCM was derived from observed best practices in thousands of
development organizations that demonstrated a capability to
develop software in a robust, scalable, and repeatable way. By
automating these best practices, UCM provides value to a
development organization in many ways, but four areas are key:
• Abstraction: we work best on higher-level tasks
• Communication: about individual activities, relieving
developers of the burden of remembering the specific
files and versions they created to fulfill activities on
which they worked
39. Unified Change Management
• Stability: the project progresses in a known, controlled
way with markers placed along the way to denote
intermediate stable points
• Control: mechanisms to assist in managing the flow of
changes from a developer's isolated development
stream to a project-integration area or to other
developers; tracking, managing, and controlling the
flow of changes from the project's integration area or
from other developer's streams; and assisting in
integrating those changes
41. A new role…
The configuration manager is familiar with an organization's
configuration and change-management processes and with the
SCM tools being used. The configuration manager is
responsible for creating and maintaining the physical
infrastructure necessary to implement the design. This
primarily involves creating and maintaining repositories and
importing existing files and directories. (In some organizations
the configuration manager is also responsible for things such as
disk space allocation, network resources, and backup strategies
as they relate to SCM data. The process described here
allocates these activities to the system administrator.)
47. Finally
UCM provides the software-configuration management tools and
processes to achieve effective, efficient software development. It does
this by building upon a model that unifies the activities and artifacts
upon which projects are built and progress. This model serves to raise
the level of abstraction at which development is done; to provide
stability for projects and individual contributors; to manage, track, and
control the flow of changes in a project; and, finally, to provide facilities
for automated project metrics as well as real-time communication
about a project's activities and artifacts. You have seen that the UCM
process can be described in terms of five roles: the architect, the
configuration manager, the project manager, the developer, and the
integrator.
48. IEEE 828 propose a structure for a SCM Plan; it must
constains:
Introduction
Describes the purpose of the plan, the scope of its
application, the key terms and references
SCM Management
Who - Indicates the responsibilities and authority to carry
out the activity plan
SCM Activities
How - Indicates all activities to be performed in the
application to the project
SCM Shedule
When - Indicates the required coordination of SCM
activities with other activities in the project
SCM Resources
What - Indicates the tools, human and physical
resources to implement the plan
SCM Maintance Plan
Indicates how the plan will be maintained during its
application
IEEE-828 SCM Plan
49. Introducción
Describir el sistema o los ítems de configuración a los cuales se les
aplica el plan, además el propósito del plan y los documentos
relacionados y aplicables en orden de prioridad
Políticas y procedimientos
Incluir los elementos de la administración de la configuración que
estén acordados. Se deben definir las políticas, organización y las
responsabilidades, criterios para selección de los IC y la frecuencia y
control de los informes.
Identificación de la configuración
Se recomienda elaborar un árbol de la familia de IC con las
especificaciones, convención de numeración, las líneas base por ser
establecidas.
Control de la configuración
Indicar la organización, composición y téminos de JC y su relación
con otras juntas. Además se debe especificar los procedimientos
para el control de cambios.
Recuento del estado de la configuración
Definir los procedimientos para recolectar los registros y como se
deben mantener los datos necesarios para producir informes.
Auditoría de la Configuración
Se debe incluir la lista de auditorías a realizar, los procedimientos de
auditorias y las autoridades y disciplinas involucradas.
Plan según propuesta de NTC-ISO 10007
50. You must remember…
• SCM is a strategic practice oriented to products, projects and
organization, helping to reduce the chaos.
• With tools only, we can only achieve to automate processes, so the
organization obtain low-quality products faster
• SCM allows the improvement of product quality, understanding and
knowing how it should be implemented in projects (it is a critical
success factor).
• Tools are used to benefit the SCM implementation, but have it without
having done a previous training, without defined policies and without
established metrics, is a practice that leads to the automation of chaos.
