The principles and structural understanding that allow later currents to remain traceable to their origins.
Foundation explains the ideas, constraints, stewardship practices, and engineering principles that support the Journey. It provides context without requiring every reader to begin at the beginning.
The enduring ideas that guide how systems are acquired, integrated, documented, and improved.
Preserve sources, document decisions, and keep the reasoning available to those who inherit the system.
Later understanding should remain connected upstream to the evidence and decisions that shaped it.