This workbook delves into the problems of excessive and debilitating doubt. It begins by examining the absurdity of doubt, a cognitive process experienced by all and yet poorly understood by most.  A distinction is made between healthy and unhealthy doubt.  It is the unhealthy forms of doubt that often contribute to a host of personal problems like worry, obsessionality, depression, pathological guilt, self-loathing, and the like.  Unfortunately the role of doubt is often ignored in established forms of psychological treatment.  The first six chapters focus on the core characteristics of doubt like intolerance of uncertainty, indecisiveness, pursuit of conviction, perfectionism and risk aversion.  The next three chapters drill into three types of doubt; obsessive doubt, relationship doubt, and religious doubt.  The final three chapters provide step-by-step instruction in using cognitive-behavioral interventions to correct erroneous doubt, boost tolerance of uncertainty, and use critical thinking skills to act more decisively.  Exercises, worksheets, and other resource materials are provided in each chapter.  The workbook will be published by New Harbinger Publications with a Februrary 1, 2026 release date.