The development methodology, systems‐development life cycle (SDLC),
was first developed in the 1960s to manage the large software projects
associated with corporate systems running on mainframes. It is a very
structured and risk‐averse methodology designed to manage large
projects that included multiple programmers and systems that would have
a large impact on the organization.
Various definitions of the SDLC methodology exist, but most contain the
1. Preliminary Analysis. In this phase, a review is done of the request. Is
creating a solution possible? What alternatives exist? What is
currently being done about it? Is this project a good fit for our
organization? A key part of this step is a feasibility analysis, which
includes an analysis of the technical feasibility (Is it possible to create
this?), the economic feasibility (Can we afford to do this?), and the
legal feasibility (Are we allowed to do this?). This step is important in
determining if the project should even get started.
2. System Analysis. In this phase, one or more system analysts work
with different stakeholder groups to determine the specific
requirements for the new system. No programming is done in this
step. Instead, procedures are documented, key players are
interviewed, and data requirements are developed in order to get an
overall picture of exactly what the system is supposed to do. The
result of this phase is a system‐requirements document.
3. System Design. In this phase, a designer takes the system‐
requirements document created in the previous phase and develops
the specific technical details required for the system. It is in this
phase that the business requirements are translated into specific
technical requirements. The design for the user interface, database,
data inputs and outputs, and reporting are developed here. The
result of this phase is a system‐design document. This document will
have everything a programmer will need to actually create the
4. Programming. The code finally gets written in the programming
phase. Using the system‐design document as a guide, a programmer
(or team of programmers) develop the program. The result of this
phase is an initial working program that meets the requirements laid
out in the system‐analysis phase and the design developed in the
5. Testing. In the testing phase, the software program developed in the
previous phase is put through a series of structured tests. The first is
a unit test, which tests individual parts of the code for errors or bugs.
Next is a system test, where the different components of the system
are tested to ensure that they work together properly. Finally, the
user‐acceptance test allows those that will be using the software to
test the system to ensure that it meets their standards. Any bugs,
errors, or problems found during testing are addressed and then
6. Implementation. Once the new system is developed and tested, it
has to be implemented in the organization. This phase includes
training the users, providing documentation, and conversion from
any previous system to the new system. Implementation can take
many forms, depending on the type of system, the number and type
of users, and how urgent it is that the system become operational.
These different forms of implementation are covered later in this
7. Maintenance. This final phase takes place once the implementation
phase is complete. In this phase, the system has a structured support
process in place: reported bugs are fixed and requests for new
features are evaluated and implemented; system updates and
backups are performed on a regular basis.
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