He provides a comprehensive explanation of the four steps that must be undertaken to assess the structure safely:
• finding the loads and forces it must endure;
• applying some safety factors;
• finding the structural details and calculating the stresses;
• comparing the stresses to the material strengths.
He does this all without requiring readers to do extensive mathematics, and he also outlines when it's time to seek help from a professional consultant to answer that critical question: Is it Strong Enough?