Many surveyors are nervous about diagnosing cracks observed in a building. This is understandable, as the interpretation of cracks can be difficult to teach, with university courses providing little or no time for field experience. Yet by understanding one straightforward principle, the majority of cracks can be diagnosed in just a few minutes. This book provides a methodology by which cracks and movement in buildings can be diagnosed. Essential reading for the relatively inexperienced surveyor or engineer and undergraduate students of surveying as a practical guide for use on site.