This phase, commonly known as the Development/Implementation phase in many System Development Life Cycle (SDLC) models, is where the system design is translated into a functional product. Key activities include writing code ("programming") that adheres to the design specifications, integrating software and hardware components, and preparing the system for its end-users. This preparation involves creating comprehensive system documentation (for users, administrators, and maintenance) and developing and delivering training programs to ensure users can operate the system effectively and securely.

A. Initiation: This is the first phase, focused on defining the system's purpose, scope, and feasibility, long before any coding or training material development occurs.
C. Design: This phase involves creating the detailed technical specifications and architectural blueprint for the system, but no actual coding or system building takes place.
D. Evaluation and acceptance: This phase occurs after development and involves testing the built system to verify it meets the specified requirements before it is formally accepted for deployment.

1. National Institute of Standards and Technology (NIST) Special Publication 800-64 Rev. 2

Security Considerations in the System Development Life Cycle.

Section 2.2

Development / Acquisition Phase (Page 8): "During this phase

the system is developed or acquired

installed

and configured in accordance with the specifications detailed in the design phase... System documentation is developed during this phase... Training materials are also developed and finalized during this phase." This directly aligns the activities of development (programming)

documentation

and training within a single phase.

2. Purdue University

College of Technology Courseware

CNIT 45500 - Systems and Software Security.

Module: Secure Software Development Life Cycle

"Implementation Phase": Course materials describe this phase as where the actual code is written based on the design documents. It also emphasizes the creation of secure coding standards and initial documentation for the system's functionality

which precedes formal user training.

3. Sommerville

I. (2016). Software Engineering (10th ed.). Pearson.

Chapter 2

Section 2.1.3

"Software design and implementation": This academic textbook describes the implementation stage as the process of "realizing the design as a program." It is distinct from the design phase (creating specifications) and the validation phase (testing). The development of user documentation is also cited as a key activity during implementation.