Section 84 of 103
83. Lifecycle Stage, State, Gate and Transition
Stable section ID: S05-CON-015-SECTION-84 · 14 content blocks
A Lifecycle Stage is a broad period of activity or responsibility, such as planning, design, manufacturing, installation, operation, maintenance, reuse, or retirement.
A Lifecycle State is the declared condition of an Engineering Entity at a specific time, such as draft, released, manufactured, inspected, installed, commissioned, operational, isolated, damaged, requalified, or retired.
A Lifecycle Gate is a controlled decision point at which evidence is reviewed to determine whether an entity may proceed, remain, return, or stop.
A Transition is an authorized movement from one defined State or Stage to another.
Each Gate should identify:
entry criteria;
required evidence;
decision authority;
permitted outcomes;
unresolved conditions;
required records;
conditions for reversal or re-entry.
A Stage may contain multiple States and Gates. Passing a Gate does not prove that every later activity is complete, and recording a new State does not itself establish that the physical transition occurred.
Safety-relevant Transitions shall be based on verified conditions rather than schedule, software status, payment status, or assumption.