Skip to main content

Software Development Life Cycle (SDLC)

Phases in Software Development

  1. Definition and Analysis of System Requirements
    1. Clarity of the Specifications
    2. Specifications are obtained for
      1. Required processing of data
      2. Necessary functions & tasks and their expected performance
      3. Expected system behavior
      4. Design constraints
      5. Life cycle of the product
  2. Development
    1. Software design, coding and testing are the main activities in the development process.
  3. Support
    1. Software should need little support for software reengineering by changing environment

Models for process Life Cycle

  1. Linear Sequential Life cycle model
    1. Model/ Analyze
    2. Design of data structures, software architecture, Interfaces and Algorithms
    3. Testing the internal logic and external functions
  2. Rapid Development Model (RAD)
    1. Each software component of Linear Model developed by a team
    2. Stage 1 – Business modeling
    3. Stage 2 – Characteristics and attributes of sets of Data Structures and objects, data modeling, software architecture
    4. Stage 3 – Description of adding, deleting, modifying and retrieving data objects
    5. Stage 4 – Code creation
    6. Stage 5 – Testing stage
  3. Increment development model
    1. Delivering the software incrementally
    2. Stage 1 – Same as Linear Model Analyzing, designing, coding and testing
    3. Stage 2 – When 1st effort is at design, the 2nd effort starts analyzing
    4. Stage 3 – When 1st effort is at coding, the 2nd effort starts designing, the 3rd effort starts analyzing.
    5. Stage 4 - When 1st effort is at testing, the 2nd effort starts coding, the 3rd effort at designing and the 4th effort starts analyzing.
  4. Concurrent model
    1. Under development
    2. Awaiting change
    3. Under revision
    4. Done
  5. Component based model
    1. Identification of software components
    2. Selection of classes from software components library
    3. Sort available components
    4. Reengineer components and create unavailable components
    5. Construct software from the components and test them
    6. Iteratively construct till final validation
  6. Fourth Generation tool base development (4GL) model
    1. Automatic report generation for high level graphics, data base queries
    2. Automated HTML code generation when creating a website
  7. Object oriented development model
    1. Currently software development process combine object orientation and fourth generation tools

Software Analysis

  • Requirement Analysis
  • Any problem can be modeled as
    • Information domain
    • Functional domain
    • Behavioral domain
  • Prototype development and prototype specification often helps
  • Many times, it may not be possible to completely specify a problem




Software Design

  • Architectural design
  • Data design
  • Interface design
  • Component design

Comments

Popular posts from this blog

Installing ns3 in Ubuntu 22.04 | Complete Instructions

In this post, we are going to see how to install ns-3.36.1 in Ubuntu 22.04. You can follow the video for complete details Tools used in this simulation: NS3 version ns-3.36.1  OS Used: Ubuntu 22.04 LTS Installation of NS3 (ns-3.36.1) There are some changes in the ns3 installation procedure and the dependencies. So open a terminal and issue the following commands Step 1:  Prerequisites $ sudo apt update In the following packages, all the required dependencies are taken care and you can install all these packages for the complete use of ns3. $ sudo apt install g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-

Installation of NS2 (ns-2.35) in Ubuntu 20.04

Installation of NS2 (ns-2.35) in Ubuntu 20.04 LTS Step 1: Install the basic libraries like      $] sudo apt install build-essential autoconf automake libxmu-dev Step 2: install gcc-4.8 and g++-4.8 open the file using sudo mode $] sudo nano /etc/apt/sources.list Include the following line deb http://in.archive.ubuntu.com/ubuntu bionic main universe $] sudo apt update $] sudo apt install gcc-4.8 g++-4.8 Step 3:  Unzip the ns2 packages to home folder $] tar zxvf ns-allinone-2.35.tar.gz $] cd ns-allinone-2.35/ns-2.35 Modify the following make files. ~ns-2.35/Makefile.in Change @CC@ to gcc-4.8 change @CXX@ to g++-4.8 ~nam-1.15/Makefile.in ~xgraph-12.2/Makefile.in ~otcl-1.14/Makefile.in Change in all places  @CC@ to gcc-4.8 @CPP@ or @CXX@ to g++-4.8 open the file: ~ns-2.35/linkstate/ls.h Change at the Line no 137  void eraseAll() { erase(baseMap::begin(), baseMap::end()); } to This void eraseAll() { this->erase(baseMap::begin(), baseMap::end()); } All changes made Step 4: Open a new termi

Installation of NS2 in Ubuntu 22.04 | NS2 Tutorial 2

NS-2.35 installation in Ubuntu 22.04 This post shows how to install ns-2.35 in Ubuntu 22.04 Operating System Since ns-2.35 is too old, it needs the following packages gcc-4.8 g++-4.8 gawk and some more libraries Follow the video for more instructions So, here are the steps to install this software: To download and extract the ns2 software Download the software from the following link http://sourceforge.net/projects/nsnam/files/allinone/ns-allinone-2.35/ns-allinone-2.35.tar.gz/download Extract it to home folder and in my case its /home/pradeepkumar (I recommend to install it under your home folder) $ tar zxvf ns-allinone-2.35.tar.gz or Right click over the file and click extract here and select the home folder. $ sudo apt update $ sudo apt install build-essential autoconf automake libxmu-dev gawk To install gcc-4.8 and g++-4.8 $ sudo gedit /etc/apt/sources.list make an entry in the above file deb http://in.archive.ubuntu.com/ubuntu/ bionic main universe $ sudo apt update Since, it&#