Quality attributes in software architecture

QUALITY ATTRIBUTES : SOFTWARE
ARCHITECTURE
Dr. Himanshu Hora
SRMS College of Engineering & Technology, Bareilly (U.P.), INDIA

Introduction
2
 Functionality and Quality Attributes are orthogonal
 Overall factors that affect run-time behavior, system
design, and user experience
Software quality is the degree to which software
possesses a desired combination of attributes(e.g.,
reliability, interoperability) [IEEE 1061].

Architecture and Quality Attributes
3
 Architecture, by itself, is unable to achieve qualities
 Architecture should include the factors of interest for
each attribute

Quality Attributes Scenario
4
 Is a quality-attribute-specific requirement
 It consists of six parts:
 Source of stimulus
 Stimulus
 Environment
 Artifact
 Response
 Response measure
Figure 1: Quality attributes Parts

Common Quality Attributes
5
 It categorizes the attributes in various specific areas
 Design qualities
 Runtime qualities
 System qualities
 User qualities
 Non-runtime qualities
 Architecture qualities
 Business qualities

Design Quality Attributes
6
 Conceptual Integrity:
 Defines the consistency and coherence of the overall
design
 Includes the way that components or modules are
designed
 Maintainability:
 Ability of the system to undergo changes with a degree of
ease
 Reusability:
 Defines the capability for components and subsystems to
be suitable for use in other applications

Runtime Quality Attributes
7
 Interoperability:
 Ability of a system or different systems to operate
successfully by communicating and exchanging
information with other external systems written and
run by external parties
 Manageability:
 Defines how easy it is for system administrators to
manage the application
 Reliability:
 Ability of a system to remain operational over time

8
 Scalability:
 Ability of a system to either handle increases in load
without impact on the performance of the system, or
the ability to be readily enlarged
 Performance:
 Indication of the responsiveness of a system to
execute any action
 Security:
 Capability of a system to prevent malicious or
accidental actions outside of the designed usage

9
 Availability:
 Proportion of time that the system is functional and
working
 Measured as a percentage of the total system
downtime over a predefined period

10
Figure 2: Availability of general scenario

11
Figure 3: Sample performance scenario
Figure 4: Sample security scenario

System Quality Attributes
 Supportability:
 Ability of the system to provide information helpful for
identifying and resolving issues when it fails to work
correctly
 Testability:
 Measure of how easy it is to create test criteria for the
system and its components
12
Figure 5: Sample testability scenario

User Quality Attributes
 Usability:
 Defines how well the application meets the
requirements of the user and consumer by being
intuitive
13
Figure 6: Sample usability scenario

Non-runtime Quality Attributes
14
 Portability:
 Ability of a system to run under different computing
environments
 Reusability:
 Degree to which existing applications can be reused
in new applications
 Integrability:
 Ability to make the separately developed components
of the system work correctly together

15
 Modifiability:
 Ease with which a software system can accommodate
changes to its software
Figure 7: Sample modifiability scenario

Architecture Quality Attributes
16
 Correctness:
 Accountability for satisfying all requirements of the
system
 Conceptual Integrity:
 Integrity of the overall structure that is composed
from a number of small architectural structures

Business Quality Attributes
17
 Cost and schedule:
 Cost of the system with respect to time to
market, expected project lifetime, and utilization of
legacy and COTS systems
 Marketability:
 Use of the system with respect to market competition

18
THANK YOU
Dr. Himanshu Hora
SRMS College of Engineering & Technology, Bareilly (U.P.), INDIA

Quality attributes in software architecture

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