This note summarizes the qualitative application of Energy-Efficiency Theory (EET) to condensed matter structures. It defines the core parameters—constrained-state energy Ec, total energy Etotal, constrained-state energy fraction fc = Ec/Etotal, energy ratio η = E˙ resp/E˙ main, and constraint barrier Eb—as established in the EET core rules. It then offers qualitative remarks on the relationship between structural order and fc: crystals, characterized by long-range order, are expected to have high fc; amorphous solids, with only short-range order, are expected to have lower fc; quasicrystals, which exhibit quasiperiodic order without translational periodicity, may have intermediate fc. No quantitative thresholds or predictive scaling relations are proposed. Classical relations from solid-state physics—such as the speed of sound vs = p K/ρ, the Debye temperature ΘD, and the correlation between glass transition temperature Tg and bond energy Eb—are recalled as background. This note is intended as a reference for qualitative use of EET concepts in condensed matter contexts. It is classified as a rule-consequent paper, presenting definitions and qualitative expectations without empirical predictions.