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The Software Life Cycle Model provides a framework for the life cycle of a computer system
from initiation, development and maintenance. In order to ensure the developed system meet the business needs,
work properly, be effectively developed and be well maintained, standards and guidelines are essential through
out the whole Software Life Cycle. The purpose of this document is to introduce the Software Life Cycle Model
adopted in OGCIO, together with the established set of standards and guidelines.
The Software Life Cycle Model adopted in OGCIO is depicted below. The model
is composed of the System Development Cycle and the System Maintenance Cycle. The System Development Cycle
covers a number of phases starting from Project Request, Feasibility Study, Systems Analysis and Design, Implementation
and Post Implementation Review. The System Maintenance Cycle covers the System Maintenance phase. A comprehensive
set of standards and guidelines has been established for supporting different activities of the whole Software
Life Cycle including project management, system development (either by Structured Systems Analysis and Design, Rapid
Application Development or Object Oriented Methodology), software testing, maintenance, quality management, resources
estimation, software configuration management, etc.
Software Life Cycle Model
Project Request
To request for an IT solution, the user department should submit an Initial Request Statement (IRS). The
IRS will be assessed and decision will be made on whether the project should proceed to the next phase or not |
Feasibility Study
To assess the feasibility of an IT solution and to quantify the requirements, scope, costs, benefits
and other implications of the proposed solution |
Systems Analysis and Design
To investigate the existing system, to specify the new system, and to detail the implementation requirements
by performing Systems Analysis and Logical System Design |
Implementation
To implement the findings of the SA&D by performing Physical System Design, Program Development,
various kinds of testing, installation and Project Evaluation Review |
Post Implementation Review
To evaluate the cost-effectiveness of an implemented system and assess whether the system has
achieved its agreed objectives and realized the intended benefits in a timely manner |
System Maintenance
To ensure the performance and functionality of the system match with the business needs of the users
by on-going monitoring and maintenance |
Depending on the complexity and nature of the computerization project, project teams of OGCIO should
have the flexibility in the adoption of the above standards and methodologies. If the standards and methodologies are
adopted, the level of details and the extent of using them could be tailored to suit different project situations and
needs. Besides, combined phases approach e.g. combined Feasibility Study / Systems Analysis & Design could be adopted.
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