The Programming and Training phase, also known as the Development/Implementation phase in many SDLC models, is where the architectural and design specifications are translated into actual code and system components. Developers build the software, databases, and other elements "faithfully" according to the blueprints created during the design phase. Concurrently, training materials are often developed, and initial training sessions are planned to prepare users for the system's eventual deployment. This phase is the primary point of creation where the conceptual design becomes a tangible product.

B. Evaluation and acceptance: This phase occurs after programming and is focused on testing and formally accepting the completed system, not on building it from design specifications.
C. Definition: This is an early phase focused on gathering and documenting user and system requirements, which occurs before the detailed design and programming work begins.
D. Initiation: This is the first phase where the need for a system is identified and the project is conceived. No design or development work is performed here.

1. National Institute of Standards and Technology (NIST) Special Publication 800-64 Rev. 2, Security Considerations in the System Development Life Cycle. Section 2.1, "The System Development Life Cycle," describes the Development/Acquisition Phase. This phase explicitly includes the activities of designing, purchasing, programming, developing, or otherwise constructing the information system. This directly corresponds to the act of incorporating components into design specifications.

2. Pfleeger, S. L., & Atlee, J. M. (2009). Software Engineering: Theory and Practice (4th ed.). In Chapter 3, "The Software Life Cycle," the "Implementation" or "Coding" phase is described as the stage where the design is translated into source code, which is the essence of faithfully incorporating the design specifications into the software.

3. University of Virginia, Department of Computer Science Course CS 4730: Software Engineering. Lecture notes on "Software Processes" describe the Implementation and testing phase. It is defined as the stage where "the software design is realized as a set of programs or program units," directly aligning with the question's description.