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+# Structural Analysis Family Guidance
+
+Read only the family selected by the approved requirements. Coupled features apply each relevant section and define the coupling terms explicitly.
+
+## Common
+
+Check DOF ordering, boundary conditions, units, coordinate transforms, rigid-body modes, element orientation, residual convention, output location, and conservation or equilibrium identities.
+
+## Linear static
+
+Define linearization assumptions, stiffness symmetry expectations, load assembly, constraint treatment, reactions, patch tests, rigid-body/null-space checks, and mesh-convergence quantities.
+
+## Nonlinear static
+
+Define configuration and strain/stress measures, state update, residual and consistent tangent, load/time parameter, convergence norms, increment/cutback behavior, path dependence, and energy or work checks.
+
+## Modal, eigenvalue, and buckling
+
+Define matrix problem, boundary conditions, mass or geometric stiffness, eigensolver target, normalization, repeated-mode handling, sign/phase invariance, residual norms, and mode correlation. Distinguish linearized buckling from nonlinear collapse.
+
+## Dynamics
+
+Define mass and damping, initial conditions, time integration, stability and algorithmic dissipation, load history, time-step convergence, energy balance, frequency/phase measures, and modal truncation where applicable.
+
+## Contact and constraints
+
+Define gap and normal orientation, active-set/search semantics, normal and tangential laws, enforcement method, consistent contributions, state transitions, penetration/slip measures, and action-reaction checks.
+
+## Material nonlinearity
+
+Define admissible state, yield/failure surface, flow/evolution laws, integration algorithm, consistent material tangent, history initialization, loading/unloading cases, and single-point constitutive tests.
+
+Do not apply an irrelevant checklist merely for completeness. If the family is ambiguous and the choice changes physical meaning or acceptance, return `needs-user-decision`.