Method — Interaction Protocol

Definition, scope boundary, and structural model.

Definition

An interaction protocol describes a structured set of rules, signals, and procedures that govern how entities exchange information, coordinate actions, or respond to each other within a system.

These protocols define the permissible sequences of interaction, expected behaviors, and interpretation of exchanged signals across participating entities.

Scope Boundary

Included

Rule-based interaction structures between entities

Defined communication sequences and message exchange patterns

Coordination mechanisms governed by protocol rules

Interaction constraints and allowed transitions

Multi-entity communication and coordination protocols

Excluded

Implementation-specific communication technologies

Network transport layer definitions

Human behavioral interaction models

Unstructured or ad hoc interaction patterns

Single-entity decision processes without interaction

Structural Phase Model

Phase 1 — Protocol Definition

The interaction rules, permissible actions, and communication formats are defined and made available to participating entities.

Phase 2 — Initiation

An entity initiates interaction according to the defined protocol rules and expected sequence conditions.

Phase 3 — Exchange

Entities exchange messages, signals, or actions in accordance with protocol-defined sequences and constraints.

Phase 4 — Completion

The interaction concludes when defined protocol conditions are satisfied, resulting in a completed exchange or state transition.