we focus on the forces and influences that are at work as the architect begins creating-envisioning-the central artifact of the system whose influences persist beyond lifetime of the system

1. Unit1-1

2. 1.The Architecture Business Cycle(ABC)
2.What Is Software Architecture
3.Architectural patterns, Reference models and
Reference architectures
4.Architecture structures and views

3. 1.1 Where Do Architectures Come From?
1.2 Software Processes and The Architecture
Business Cycle
1.3 What Makes a “Good Architecture”?

4. Definition
 The software Architecture of a program or
computing system is the structure or
structures of the system, which comprise s/w
elements, the externally visible properties of
those elements, and the relationships among
them

5.  Software architecture is a result of technical,
business and social influences. Its existence
in turn affects the technical, business and
social environments that subsequently
influence future architectures. We call this
cycle of influences, from the environment to
the architecture and back to the environment,
the Architecture Business Cycle(ABC)

7.  Architectures are influenced by
 -System Stakeholders
 -the Developer Organization
 -the background and Experience of the
Architects
 -the technical Environment

8. Ramifications of influences on an
Architecture

9. The architecture affect the factors that
influence them

10. Architecture Activities
 Creating the Business Case for the System
 Understanding the Requirements
 Creating or selecting the Architecture
 Communicating the Architecture
 Analyzing or Evaluating the Architecture
 Implementing Based on the Architecture
 Ensuring the Conformance to an Architecture

11. Divided into Two Clusters
 Process recommendations
 Product(or structural) recommendations

12. Definition
 The software Architecture of a program or
computing system is the structure or
structures of the system, which comprise s/w
elements, the externally visible properties of
those elements, and the relationships among
them

14.  Architecture defines s/w elements
 Systems can and do comprise more than one
structure
 Every computing system with s/w has a s/w
architecture
 The behavior of each element is part of the
architecture

15.  An Architectural Pattern is a description of
element and relation types together with a
set of constraints on how they may be
used.
 A Reference model is a division of
functionality together with data flow
between the pieces.

16.  A Reference Architecture is a reference model
mapped onto software elements(that
cooperatively implement the functionality
defined in the reference model) and the data
flows between them.

18. Architectural Structures can by and large be
divided into 3 groups, depending on the
broad nature of the elements they show.
 Module Structures
 Component-and-Connector structures
 Allocation Structures

20. Architectural Structures of a System

21.  Relating Structures to each other
 Which Structures to choose?
Kruchten’s four views follow:
-Logical
-Process
-Development
-Physical