This document provides guidelines for writing effective photo captions in 3-4 sentences or less. It discusses different types of captions such as identification bars, cutlines, summaries, and expanded captions. The document recommends a 4-part structure for captions: a lead-in, present tense sentence, past tense sentence, and quote. It also offers tips for investigating photos, interviewing subjects, and crafting captions that provide essential details about who, what, when, where, why and how. Captions should concisely yet thoroughly describe the key elements of the photo.