6 Plus Writing Traits Powerpoint Professional DevelopmentThe 6 +1 Traits® of Writing model is used throughout the United States and the world. It has become a highly respected, essential tool for evaluating student writing and planning instruction. Ruth Culham is the primary author and expert on the 6 +1 Traits® of Writing. The core of the 6 +1 Trait® Writing Model of Instruction & Assessment is a set of rubrics that specify how to assess the quality of student writing and tailor instruction