This document discusses the importance of effective blackboard writing skills for teachers. It begins by noting that a supervisor's first impression of a student teacher's competence comes from observing their blackboard work. Several principles of blackboard writing are then outlined, including writing legibly in an appropriately sized font, facing the class while writing, and developing a clear summary. Components of strong blackboard skills like clarity, cleanliness, and appropriateness are also defined. Overall, the document conveys that blackboard writing is a key visual teaching aid and evaluation metric for student teachers.