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Software design process

Software design is generally considered a two-step process:

Architectural design

Architectural design describes how software is decomposed and organized into components (the software architecture).

Detailed design

Detailed design describes the specific behavior of these components. The output of this process is a set of models and artifacts that record the major decisions that have been taken.

Enabling techniques

According to the Oxford English Dictionary, a principle is “a basic truth or a general law … that is used as a basis of reasoning or a guide to action”. Software design principles, also called enabling techniques, are key notions considered fundamental to many different software design approaches and concepts.

Abstraction

Abstraction is “the process of forgetting information so that things that are different can be treated as if they were the same”. In the context of software design, two key abstraction mechanisms are parameterization and specification. Abstraction by specification leads to three major kinds of abstraction: procedural abstraction, data abstraction, and control (iteration) abstraction.

Coupling and cohesion

Coupling is defined as the strength of the relationships between modules, whereas cohesion is defined by how the elements making up a module are related.

Decomposition and modularization

Decomposing and modularizing large software into a number of smaller independent ones, usually with the goal of placing different functionalities or responsibilities in different components.

Encapsulation/information hiding

Encapsulation/information hiding means grouping and packaging the elements and internal details of an abstraction and making those details inaccessible.

Separation of interface and implementation

Separating interface and implementation involves defining a component by specifying a public interface, known to the clients, separate from the details of how the component is realized.

Sufficiency, completeness and primitiveness

Achieving sufficiency, completeness, and primitiveness means ensuring that a software component captures all the important characteristics of an abstraction, and nothing more.

Breakdown of topics for the Software Design

Software structure and architecture

In its strict sense, a software architecture is “a description of the subsystems and components of a software system and the relationships between them”. Architecture thus attempts to define the internal structure -according to the Oxford English Dictionary, “the way in which something is constructed or organized” - of the resulting software. During the mid-1990s, however, software architecture started to emerge as a broader discipline involving the study of software structures and architectures in a more generic way. This gave rise to a number of interesting ideas about software design at different levels of abstraction. Some of these concepts can be useful during the architectural design (for example, architectural style) of specific software, as well as during its detailed design (for example, lower-level design patterns). But they can also be useful for designing generic systems, leading to the design of families of programs (also known as product lines). Interestingly, most of these concepts can be seen as attempts to describe, and thus reuse, generic design knowledge.

Questions & Answers

define iterative model. example of iterative model. advantages and disadvantages of iterative model. when to use iterative model
Okello Reply
i try out in netbeans this code:public class Profile { private Profile(int w) { // line 1 System.out.println(w); } public final Profile() { // line 5 System.out.println(10); } public static void main(String args[]) { Profile obj = new Profile(50); } } It is the question 5, and the answer is 50
Jacqueline Reply
i need help....Discuss the factors that influence the choice of the software development methodology to use when implementing software projects?(20)
tatenda Reply
The success rate of software development projects can be increased by using a methodology that is adequate for the specific characteristics of those projects.  then the focus on RAD,XP,RUP.
Hemant
hemant hie...it is a presentation i am working on...can you help me wth the introduction....please a powerful one hahahahha
tatenda
yes
Hemant
Define and show all Dipthongs and vowels used in english phonetics
Okendro Reply
what is the software engineering
Axmed Reply
Please how can I create an application?
Eric Reply
please how can I create an application
Nchor
How do we create a software
Florence Reply
give a more direct question
Louis Reply
what is semantics?
amjad
what r the computer codes
Kawuba Reply
machine code, source code , object code, and byte code etc
Hemant
what is software
Manobendra Reply
a collection of program executable by code is called software
Hemant
how can I create a software
Mary Reply
use in any model . then after you create any software
Hemant
what is capability maturity model integration
Muctarr
what is maturity level
Muctarr
maturity level is organization's process improvement achievement in multiple process areas
Hemant
how to trubulshoot is configuration ?
priya Reply
hello
Julius
hello
abeer
hello
Sahil
hello
Natnael
Hello
Eric
Guy's put your answer only
Natnael
click start then click run then type msconfig then ok
Natnael
explain coco model
dawood Reply
it model based on LOC. i.e; number of lines of code.
Hemant
What is a client engineer
buthayna Reply
A Customer Engineer (CE) is a worker whose primary job scope is to provide a service to customers who have signed a contract with the company.
Fokuo
Thank you
buthayna
Hi
ahly
hello,how are you doing?
Fokuo
nothing
Hemant
it's a pleasure meeting you.
Fokuo
tq
Hemant
Nice to meet you too
Hemant
good night
Hemant
hi in here
Asongafac
hello
Eric
please I want to more about this group
Asongafac
pravinkumar
pravin
hello
pravin
I want to create software
Michael
name suraj kumae
Suraj
how can i ave install usb drive but get it not connecting phone
Micheal Reply
hmm
abang
may be it has a problem
abang
maybe u should change usb drive
gabriel
yes
Ali

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Source:  OpenStax, Software engineering. OpenStax CNX. Jul 29, 2009 Download for free at http://cnx.org/content/col10790/1.1
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