Transcript System Development Life Cycle

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System Development Life Cycle
In the present booming economical environment every organization plans to
expand and develop quick system and encash economic boom, as soon as
possible.
This require a process which can quickly develop new systems, in lesser time with
lesser cost.
This presentation will focus on the process of how to achieve the development
goal.
Sridhar & Santhanam
Dhiraj Birla
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What is SYSTEM DEVELOPMENT ?
We are talking about the development of a system or business so first we
should understand what is development: “System Development” refers to the process of –
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Examining a business situation,
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With the intent of improving it,
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Through better procedures and methods.
System Development is having two major component in it
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System Analysis – Analysis of current system for Problems & Demerits in it and
Additional requirements in new system
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System Design – Process of planning new system which will replace the old
one
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Beginning of a System Development
System Development usually begins when a problem or opportunity is
identified by Managers, it can be because of any of the followings:
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New design idea to smoothen the process in the organization.
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Evolving environmental changes such as Competition.
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Adding new business or product line to present business.
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Present system does not satisfy the users information needs.
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Present system no longer efficiently and effectively meets the Goals of
organization.
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Excessive time spent in correcting errors.
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Current Reports / Outputs not meting users decision making skills.
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Escalating customer and vendor complaints.
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System Development “Methodology”
A system development methodology is a formalized, standardized, documented set
of activities used to manage a system development project. It can be characterized
as follows:
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DIVISION OF PROJECT into the identifiable phases which can be managed
without having any problem.
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REVIEW OF DEVELOPMENT PROCESS by TOP Management on periodically by
getting deliverables.
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APPROVALS from all the participants of the Development (i.e. Users, Managers,
Analyst and Auditors).
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TESTING OF SYSTEM thoroughly prior to implementation to ensure that it meets
user’s needs.
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TRANNING of user who will operate the new system.
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POST IMPLEMENTATION REVIEW for effectiveness and efficiency of new system
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System Development Life Cycle
In an organization System Development Object can be achieved by following
steps:
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Preliminary Investigation
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Requirements analysis or system analysis
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Design of System
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Development of Software
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System Testing
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Implementation and Maintenance
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Preliminary Investigation
Preliminary Investigation
Whatever may be the reason of a request submitted by the Users or Managers
to the IS department a system analyst is assigned to make a preliminary
investigation.
The objective of this activity is to review all requests and identify those
proposals that are most beneficial to the organization. But this should be noted
that this is neither a designed study nor it includes collection of details to
completely describe the business system.
Preliminary Investigation object can be achieved in following steps:
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Request Clarification
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Feasibility study
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Estimating Costs and Benefits
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Request Approvals
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Preliminary Investigation
Request Clarification
Defining the Scope and Objective of Request:
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–
As mentioned in the objectives of System development objective earlier, an
analyst has to define for which objective a request for development is
submitted.
Conducting the Investigation
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–
This is nothing but the Collection of data / inputs by:
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Reviewing internal documents (i.e Organizational Charts, operating
procedures etc.
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Conducting interviews of User, Supervisory Personal and Managers
Identify viable option:
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–
Analyst has to identify the viable option by applying his common sense and
intuitions on his investigation
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Preliminary Investigation
Feasibility (Possibility) Study
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Evaluation of alternative systems through cost and benefit analysis:
Technical Feasibility: Hardware and software availability, Technical Guarantee
of Accuracy, Reliability, Easy to Access, Data security, technical capacity to hold
data and future expansion.
Economical Feasibility: Evaluation of cost & Benefits expected.
Operational Feasibility: Finding views of workers, employees, customers &
suppliers about the use of new system.
Schedule Feasibility: Estimation of time to take new system to become
operational.
Legal feasibility: Testing whether new system will comply financial reporting
requirements & Company’s contractual obligations.
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Preliminary Investigation
Estimating Cost & Benefit
COSTS:
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Development Costs: This includes cost of testing, training, start up costs, salary
to designers, acquisition cost of hardware & software.
Operation Costs: This includes operator salary, maintenance costs, etc.
Intangible Costs: Loss of employee productivity, self confidence etc.
BENEFITS:
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Tangible Benefits:
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Increase in sales / Contribution / Profits
Decrease in investment, operating and processing cost.
Improved information availability, analysis, Management Decision skill
Intangible Benefits:
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Increase in Goodwill / Improved Image of Business
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Preliminary Investigation
Request Approval
Based on the Observation and Findings of the Analyst, selected requests
are put up for the approval of management
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Requirement Analysis & System Analysis
Requirement Analysis and System Analysis
After the selection of a request for development analyst study in depth the
Present and Proposed New System. This is the study of weakness &
Problems in the present system and management requirements of new system.
This phase of System Development is being completed in following step:
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Collection of data and facts
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Analysis of Present System
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Analysis of Proposed system
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Requirement Analysis & System Analysis
Collection of Data & Facts
Every system is built to meets some set of needs and to assess these needs,
the analyst often interact extensively with the people, who will be benefited from
the system In order to determine the requirement of those peoples he can use
following facts finding techniques:
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Documents: This includes the Manuals, diagrams, forms, organizational charts
etc. It should be ensured that all documents are accurate & up to date
Questionnaires: These are skillfully drafted group of standard question which
can be given to all personal and can be analyze quickly.
Interviews: To get a complete picture of problems and opportunities.
Observation: Surprise Visit of users work palace to get a clear picture of user’s
environment.
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Requirement Analysis & System Analysis
Analysis of Present System
Detailed investigation of the present system involves collecting, organizing and
evaluating facts about the present system and the environment in which it
operates by studying following areas in depth:
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Review of Historical Aspects of organization
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Analyze Present inputs to the system
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Review of all data file maintained irrespective of online or offline
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Review methods, procedures & data communications
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Analyze Present outputs of system
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Review internal controls
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Model the existing physical system and logical system
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Undertake overall analysis of present system
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Requirement Analysis & System Analysis
Analysis of Proposed System
After each functional area of present system is defined the purposed system
specification must be defined.
These specification will be based on the strength and weakness of present system.
System Specification which should be in conformity with the Project Objective and
Areas Covered should be following:
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Output / Reports
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Maintenance of Database
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Data Inputting Process
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Methods and Procedures to show the relationship between Input and
Output
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Work volume including peak period work volume
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System Design
System Design
System design first involves Logical Design. First one has to write detailed
specification that called design specification. Than secondly it involves
Physical Design.
This Phase of System Development includes following functions:
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Designing System Output
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Designing System Input
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Data Storage
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System Design
Designing System Output
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Important factor of Output Design:
A process of Output designing contained Designing of Content (required info in
an output), Form (the way in which a content presented to user), Volume
(quantum of Output i.e. Prints), Time Lines (time of need of outputs), Media
(method of output i.e. Print, CD etc) and Format (Physical arrangement of
Data).
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Way of Presenting Information:
The way in which data will be presented to the User which should be simple
and better understandable and for this Tabular and Graphic (charts, maps etc)
can be used.
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Design / Layout of Output:
The layout of a output can be in Printed form, visual on screen etc.
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System Design
Designing of System Input
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Important Factor of Input Design:
A process of Input designing contained Designing of Content (required info in a
input), Form (the media in which input is received by user), Volume (quantum of
input records), Time Lines (required time to enter one record), Media (method
of input i.e. keyboard, BCR etc) and Format (Input by the user in the system).
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Coding: To reduce input control errors and speed up the entire process coding
is very important. This is also important to get all records in a specific form.
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Methods: Individually (Unique codes giving only one option to user out of may i.e
selection of gender from male or Female etc), Space or suggestive (for brief
information),
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Schemes: Classification Codes (only single digit is required for quick input the ),
Function code (activities to be performed without spelling out all details) etc.
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System Design
Data Storage
This includes the storage of data, indexing etc.
For storage of data it can follow following approaches:
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Conventional File Approach: This is a traditional approach where each
transaction is updated in the master file, each application have their own
database and it is not useful for other applications. (Boss in IHCL)
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Database Approach: This support decision making skill of the management.
Data are stored in the small-small database files and same data can be used in
the multiple applications. (Files maintained as a process of the organization for
MIS etc.)
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System Acquisition & Development
System Acquisition & Development
After designing the system all required resources (hardware & Software)
should be gathered. If some of them are already with the organization than it
reduces the cost of acquisition, for remaining items organization has to plan its
procurements process, this includes following:
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Selection of Hardware:
Selection of Software
Vendor Selection
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System Acquisition & Development
Selection of Hardware
While selecting the hardware for new system a developer must keep in mind
following:
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Latest Technology
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Whether requirement of business is for Scientific or Business Computer
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Software supplied by the manufacture and requirement of additional
software
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Compatible with the existing systems in organization
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System Acquisition & Development
Selection of Software
Selection of a perfect Software for organization is totally depends on the
followings:
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Rapid Implementation: Whether software can be implemented quickly and put
on use ASAP. This characteristic will not be there if software is to be developed,
hence that will take long time.
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Low Risk of Quality: Software should be properly tested by the manufacturer
for the quality otherwise organization has to spend its precious time on quality
assurance.
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Low Risk of Cost: The cost and benefit analysis will give us the perfect cost,
which organization can bear for acquiring the given software.
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System Acquisition & Development
Vendor Selection
This is finding of resources from new system hardware and software will
be procured.
At resource will be finalized based on the following:
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Performance Capability in relation to cost and quality:
Cost & Benefits: Preparation of comparative statements based on the
quotations received from vendors with terms and conditions.
Maintainability: Maintenance requirements of the new equipments
Compatibility with the Existing system:
Vendor support: Post sale support from vendors
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System Testing
System Testing
This is Performing Parallel Operation and get the following done to analyze
the operational implementation feasibility:
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Preparation realistic data based on the actual working data of the
organization. It may be based on the Historical data of the organization.
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Processing of Test Data with the new system and take all outputs which can
be possible.
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Checking result of all system with the results of the same data in the current
system for the accuracy and error in the processing.
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Review result with future users, operational and support personal:
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Implementation & Maintenance
Implementation & Maintenance
As the final Phase of the System Development it gives the results of the
whole process and handover the new system to end users.
This also includes the overall review of the development process for its
leakages and errors in it.
To complete this phase a developer has to complete the following functions
successfully:
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Equipment Installation
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Training Personnel:
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Conversion Procedure:
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Post Implementation Evaluation (Feedback)
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Implementation & Maintenance
Equipment Installation
This includes following functions:
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Site Preparation: Preparing the site for installation and mobilizing all required
equipments and personnel at the site.
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Equipment Installation: Assembling and commissioning of the equipments
(hardware) and installation of software
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Equipment Checkout: Organize test runs of the system with sample actual
data and thereafter if it performs satisfactory than with the live actual data.
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Implementation & Maintenance
Training Personnel
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Since user are not familiar with the New System, System Development Process
includes training of System Operators: IT personnel who will handle the system maintenance in
the future.
Users (Operators): The final user who will work on the system.
If there are deficiencies in Training, these may translate into reduction in
user Productivity Levels
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Implementation & Maintenance
Conversion Procedures
This is the time when organization switch over from old system to new
developed system.
Following are the Strategies / Methods for conversion / Changeover of old
system to new system.
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Direct Changeover: Direct closing the old system and starting the new
one.
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Parallel Changeover: for sometime operating both system simultaneously.
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Gradual Changeover: Department wise switch over to new systems.
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Distributed Changeover: Any other method which management feels
good for organation.
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Implementation & Maintenance
Post Implementation Evaluation (Feedback)
Analysis of Satisfaction of Users or checking whether system is Operating
Properly or whether Objectives of System Development is achieved or
not, is the most important function in whole System Development process.
This is also important for development of new system in future since each
development gives some experiences and lists some things to be taken care
off.
Post Implementation Evaluation includes following area:
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Development Evaluation: Check whether development was done
within schedule and budgets.
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Operation Evaluation: Check whether system is capable for handling
the duties and objective of development is achieved
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Information Evaluation: Check Satisfaction of users etc.
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Thank You