This document discusses deciding on the degree of emphasis for different micro skills in writing classes based on an analysis of student error frequencies. The researcher analyzed essays from 300 students to identify 13 common error types. Based on the error occurrence rates, the researcher suggested a hierarchy of error types to focus on and strategies for teaching writing skills pre-writing, writing, and post-writing. The researcher aimed to determine which micro skills and errors should receive more emphasis to help students improve their writing.