The document discusses software quality management. It describes how quality management is concerned with ensuring quality at the organizational, project, and process levels. It also discusses establishing a quality plan, defining quality attributes, using standards like ISO 9001, and performing reviews and inspections to check quality.
Software Process Models, The Linear Sequential Model, The Prototyping Model, The RAD Model, Evolutionary Process Models, Agile Process Model, Component-Based Development, Process, Product and Process.
Software Process Models, The Linear Sequential Model, The Prototyping Model, The RAD Model, Evolutionary Process Models, Agile Process Model, Component-Based Development, Process, Product and Process.
Presentation on what is the Software Quality in terms of the Software Engineering Process and as part of Software Development Industry. It also talks about what's Standards & Procedures plus explaining different types of Standards & kinds of Procedures that comes under Software Quality.
It also contain details about SQA Activities, Software Review with different kind of Review Techniques. Then after Software Reliability is discussed with Quality Standards like ISO 9001, CMM & Six Sigma at the presentation end.
In this technique, test cases are developed using the use cases of the system. A use case encompass the various actors and their interactions with the system. Use cases cover the complete transactions from start to finish. These test cases depict the actual use of software by the end user.
Presentation on what is the Software Quality in terms of the Software Engineering Process and as part of Software Development Industry. It also talks about what's Standards & Procedures plus explaining different types of Standards & kinds of Procedures that comes under Software Quality.
It also contain details about SQA Activities, Software Review with different kind of Review Techniques. Then after Software Reliability is discussed with Quality Standards like ISO 9001, CMM & Six Sigma at the presentation end.
In this technique, test cases are developed using the use cases of the system. A use case encompass the various actors and their interactions with the system. Use cases cover the complete transactions from start to finish. These test cases depict the actual use of software by the end user.
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1. Software Quality
Management
Matakuliah Rekayasa Perangkat Lunak (CS215) – Gasal 2015/2016
Magister Ilmu Komputer - Universitas Budi Luhur
Achmad Solichin, S.Kom, M.T.I (achmatim@gmail.com)
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
2. Overview
• Software Quality Management
• SQM Activities
• Software Quality attributes
• ISO 9001 Quality Management Standards
• Software Reviews and Inspections
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
3. Software Quality Management
• Concerned with ensuring that the required level of quality is achieved in a
software product.
• Three principal concerns:
• At the organizational level, quality management is concerned with establishing a
framework of organizational processes and standards that will lead to high-quality
software.
• At the project level, quality management involves the application of specific quality
processes and checking that these planned processes have been followed.
• At the project level, quality management is also concerned with establishing a quality
plan for a project.The quality plan should set out the quality goals for the project and
define what processes and standards are to be used.
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
4. Quality Management Activities
• Quality management provides an independent check on the software
development process.
• The quality management process checks the project deliverables to ensure
that they are consistent with organizational standards and goals
• The quality team should be independent from the development team so
that they can take an objective view of the software.This allows them to
report on software quality without being influenced by software
development issues.
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
5. Quality Management and Software
Development
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
6. Quality Planning
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• A quality plan sets out the desired product qualities and how these are
assessed and defines the most significant quality attributes.
• The quality plan should define the quality assessment process.
• It should set out which organisational standards should be applied and,
where necessary, define new standards to be used.
7. Quality Plan Structure [Humphrey (1989)]
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• Product introduction. A description of the product, its intended market, and
the quality expectations for the product.
• Product plans.The critical release dates and responsibilities for the product,
along with plans for distribution and product servicing.
• Process descriptions.The development and service processes and standards
that should be used for product development and management.
• Quality goals.The quality goals and plans for the product, including an
identification and justification of critical product quality attributes.
• Risks and risk management.The key risks that might affect product quality
and the actions to be taken to address these risks.
8. What is Quality?
• Quality, simplistically, means that a product should meet its specification
• This is problematical for software systems:
• Tension between customer quality requirements (efficiency, reliability,
etc.) and developer quality requirements (maintainability, reusability,
etc.)
• Some quality requirements are difficult to specify in an unambiguous
way
• Software specifications are usually incomplete and often inconsistent
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
9. Software Fitness for Purpose
• Have programming and documentation standards been followed in the
development process?
• Has the software been properly tested?
• Is the software sufficiently dependable to be put into use?
• Is the performance of the software acceptable for normal use?
• Is the software usable?
• Is the software well-structured and understandable?
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
10. Software Quality Attributes
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
Safety Understandability Portability
Security Testability Usability
Reliability Adaptability Reusability
Resilience Modularity Efficiency
Robustness Complexity Learnability
11. Process and Product Quality
• The quality of a developed product is influenced by the quality of the
production process.
• This is important in software development as some product quality
attributes are hard to assess.
• However, there is a very complex and poorly understood relationship
between software processes and product quality.
• The application of individual skills and experience is particularly important in software
development;
• External factors such as the novelty of an application or the need for an accelerated
development schedule may impair product quality.
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
12. A high quality products…
• Satisfies clearly stated requirements
• Checks its inputs and that it reacts in predictable ways to illegal inputs
• Has been inspected thoroughly by others
• Has been tested exhaustively by others
• Is thoroughly documented
• Has a known defect rate
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
14. Software Standards
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• Standards define the required attributes of a product or process.They play
an important role in quality management.
• Standards may be international, national, organizational or project
standards.
• Product standards define characteristics that all software components
should exhibit e.g. a common programming style.
• Process standards define how the software process should be enacted.
15. Importance of Standards
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• Encapsulation of best practice- avoids repetition of past mistakes.
• They are a framework for defining what quality means in a particular setting
i.e. that organization’s view of quality.
• They provide continuity - new staff can understand the organisation by
understanding the standards that are used.
16. Product and Processes Standards
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
Product standards Process standards
Design review form Design review conduct
Requirements document structure Submission of new code for system building
Method header format Version release process
Java programming style Project plan approval process
Project plan format Change control process
Change request form Test recording process
17. Problems with Standards
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• They may not be seen as relevant and up-to-date by software engineers.
• They often involve too much bureaucratic form filling.
• If they are unsupported by software tools, tedious form filling work is often
involved to maintain the documentation associated with the standards.
18. ISO 9001 Standards Framework
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• An international set of standards that can be used as a basis for developing
quality management systems.
• ISO 9001, the most general of these standards, applies to organizations that
design, develop and maintain products, including software.
• The ISO 9001 standard is a framework for developing software standards.
• It sets out general quality principles, describes quality processes in general and lays
out the organizational standards and procedures that should be defined.These should
be documented in an organizational quality manual.
19. ISO 9001 Core Processes
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
20. ISO 9001 and Quality Management
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
21. ISO 9001 Certification
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• Quality standards and procedures should be documented in an
organisational quality manual.
• An external body may certify that an organisation’s quality manual
conforms to ISO 9000 standards.
• Some customers require suppliers to be ISO 9000 certified although the
need for flexibility here is increasingly recognised.
22. Reviews and Inspections
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• A group examines part or all of a process or system and its documentation
to find potential problems.
• Software or documents may be 'signed off' at a review which signifies that
progress to the next development stage has been approved by
management.
• There are different types of review with different objectives
• Inspections for defect removal (product);
• Reviews for progress assessment (product and process);
• Quality reviews (product and standards).
23. Quality Reviews
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• A group of people carefully examine part or all of a software system and its
associated documentation.
• Code, designs, specifications, test plans, standards, etc. can all be
reviewed.
• Software or documents may be 'signed off' at a review which signifies that
progress to the next development stage has been approved by
management.
25. Program inspections
• These are peer reviews where engineers examine the source of a system with the
aim of discovering anomalies and defects.
• Inspections do not require execution of a system so may be used before
implementation.
• They may be applied to any representation of the system (requirements, design,
configuration data, test data, etc.).
• They have been shown to be an effective technique for discovering program errors.
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
26. Inspection checklists
• Checklist of common errors should be used to
drive the inspection.
• Error checklists are programming language
dependent and reflect the characteristic errors that are likely to arise in the
language.
• In general, the 'weaker' the type checking, the larger the checklist.
• Examples: Initialisation, Constant naming, loop
termination, array bounds, etc.
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
27. An inspection checklist (a)
Fault class Inspection check
Data faults Are all program variables initialized before their values are used?
Have all constants been named?
Should the upper bound of arrays be equal to the size of the array or Size -1?
If character strings are used, is a delimiter explicitly assigned?
Is there any possibility of buffer overflow?
Control faults For each conditional statement, is the condition correct?
Is each loop certain to terminate?
Are compound statements correctly bracketed?
In case statements, are all possible cases accounted for?
If a break is required after each case in case statements, has it been included?
Input/output faults Are all input variables used?
Are all output variables assigned a value before they are output?
Can unexpected inputs cause corruption?
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
28. An inspection checklist (b)
Fault class Inspection check
Interface faults Do all function and method calls have the correct number of
parameters?
Do formal and actual parameter types match?
Are the parameters in the right order?
If components access shared memory, do they have the same model
of the shared memory structure?
Storage management
faults
If a linked structure is modified, have all links been correctly
reassigned?
If dynamic storage is used, has space been allocated correctly?
Is space explicitly deallocated after it is no longer required?
Exception management
faults
Have all possible error conditions been taken into account?
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
29. Software Measurement and Metrics
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
• See Previous Chapter
30. References
• Roger S. Pressman, 2010, Software Engineering: A Practitioner’s Approach
7th edition, McGraw-Hill.
• Ian Sommerville, 2011, Software Engineering 9th edition, Addison-Wesley.
• Other references
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur
31. Thanks
• Achmad Solichin, S.Kom, M.T.I
• achmatim@gmail.com
• Twitter: @achmatim
• Facebook: facebook.com/achmatim
• Web: http://achmatim.net
CS215 – Rekayasa Perangkat Lunak – Magister Ilmu Komputer Universitas Budi Luhur