Developing Developing - 6 April 2023 A Universal Theory Model of Interaction A universal interaction model is proposed to manage systematically all theories & concepts ever developed by humans, for the intellectual endeavor to understand the governing dynamics of Nature. Interaction Model A ⇔ B : ai ↔ aj ∧ bi ↔ bj ∧ ai ↔ bj ∀ i, j ∈ N Self := ai ↔ aj ∨ bi ↔ bj ∀ i, j ∈ N Mutual := ai ↔ bj ∀ i, j ∈ N System - Boundary - Surrounding Causality : Cause - Effect Flow Sequence : σ↔β↔Σ Cause@t : Σ ⇒ Excitation ⇒ β ⇒ σ Effect@t + Δt : σ ⇒ Response ⇒ β ⇒ Σ 1