1. CS 8532: Advanced Software Engineering
Chapter 6
CS 8532: Advanced Software Engineering
Dr. Hisham Haddad
Class
will
start
momentarily.
Please Stand By …

2. Overview of System Engineering
Chapter 6

3. What is System Engineering? - 1
It is the big Picture!
The process of understanding and defining the various elements required to build a fully functional system (product, technology, service) and role of each element in the system.
Systems engineering process depends on the applications domain.
- Business process engineering
- Product engineering

4. What is System Engineering? - 2
One type of systems is Computer-Based systems, which consist of elements that work together to support a business function or to develop a product/technology.
A computer-based system elements may include Hardware, Software, People, Procedures, Documentation, and Databases.
In large complex systems, elements can be complete systems with each subsystem has its own set of above elements.

5. World view (Broad details) Detailed view (Technical details)
System Engineering Hierarchy
World view (Broad details)
Business or
Product Domain
Domain of interest
Domain view
System element
Element view
Detailed view (Technical details)
Set of
domains
Elements of
a domain
Components
of an element
Component
details

6. Example Product: Develop a new passenger car
World View: Automobile manufacturing
Focus on passenger cars segment of the domain
Domain View: People, HW, SW, Data, etc…
Element View: Assembly line HW, Parts, etc…
Detailed View: Factory building, Belts, Robot Arms, Controls,
Tools, etc… (

7. System Modeling and Simulation
The system engineer creates a system model that may focus on any level of the hierarchy (world view to details view).
The model defines the process, its behavior and assumptions, and its relation to other elements of the view and other views.
The model goal and details depend on the intended level (view). Assumptions, limitations, constraints, and references are considered.
Simulation and modeling software tools (CASE tools) make it possible to model reactive systems (e.g., real-time and embedded systems) before being built.
The result: automated, semi-automated, or non-automated solution.

8. Business Process Engineering (BPE)
Process of building “Information Systems” to help businesses utilize information effectively. It uses an integrated set of procedures, methods, and tools to identify how information systems can best meet the strategic goals of an enterprise.
Essential Elements:
- Data Architecture: define all data objects (product,
customer, supplier, etc…) and their relationships.
- Application Architecture: programs (or people) that
process/transform data objects to achieve business goals.
- Infrastructure: technologies need for data and application
architectures (computers, networks, storage, tools).

9. The BPE Hierarchy Information Strategy Planning (world view)
- define strategic goals, success factors, business rules
- create enterprise model
Business Area Analysis (domain view)
- modeling of processes and services
- defining data objects, their relationships, and data flow
Business System Design (element view)
- modeling requirements of the Information System
- translate requirements to data, applications, and
infrastructure (technology)
Construction and Integration (detailed view)
- Building software application/databases, training, etc.
See figure 6.2, page 130.

10. Product Engineering - 1 Translating requirements to a working product.
Requirements Engineering (world view)
- data gathering from the customer (intense process)
- Requirements analysis (check-list) and specifications
- Requirements validation (check list)
- Requirements management (similar to SCM activities)
Component Engineering (domain view)
- Engineering of HW, SW, human interactions, and databases
Analysis and Design (element view)
- modeling data, functions, and behavior
Construction and Integration (detailed view)
- coding, testing, and deployment

11. Processing requirement
Product Engineering - 2
System analysis
(World view)
The complete
product
capabilities
Component
engineering
(Domain view)
Processing requirement
Analysis & Design
Modeling
(Element view)
Construction
&
Integration
(Detailed view)
software
function
Software
Engineering
program
component
hardware
data
behavior
Figure 6.3, page 131

12. System Modeling
System modeling is building a representation of requirements that can be assessed for correctness, completeness, and consistency.
System modeling can done at different level.
Modeling templates may be used to build system context diagram to illustrates system interaction with other elements (users, I/O devices).
A system flow diagram shows detailed data and control flow between all elements on the template.
UML modeling of OO approach can also be used to model a system in terms of classes and their interactions.
See CLSS modeling example, figures 6.6 to 6.9, page 136.

13. Key Point
System engineering begins with “world view” of business domain or product.
Analysis is conducted to define business/product requirements (elements).
At the “domain view”, each element of the system is analyzed and assigned to engineering components.
Each engineering component is addressed by appropriate engineering discipline.
The rest of the course focuses on the SW element of Product Engineering through Software Engineering discipline.

14. Suggested Problems
Consider working the following problems from the end of chapter 6 (Textbook, page 140) for practice purpose:
6.2, 6.3, 6.4, 6.6
6.7 (here, consider any of the following systems:
Student registration system, Banking system, Digital
scanner for personal computer, system,
Internet access provider, and Interactive hotel
reservations)
6.8, and 6.11
No submission is required. Think about these problems and work them for yourself!

15. Last Slide
End of chapter 6