The document describes a simulation model of a port system with one tug that pulls tankers. It outlines the problem definition, project planning, system definition, conceptual model formulation, preliminary experimental design, input data preparation, model translation, verification and validation, final experimentation design, experimentation, analysis and interpretation, and documentation and implementation. The goal is to determine how long the tug is idle, traveling without a tanker, or engaged in berthing or deberthing activities.