For the over 25 million students enrolled in America's colleges and universities, postsecondary writing instruction is critical for success in college and beyond. In writing courses, students gain experience analyzing expectations for writing held by different audiences and practice meeting those expectations. This experience contributes significantly to the development of productive writing practices and habits of mind that are critical for success in different contexts, including academic, workplace, and community settings. This position statement offers guiding principles and enabling conditions for sound postsecondary writing instruction for stakeholders working to meet the challenges of this enterprise--among them faculty, program directors, deans, and college and university administrators. [This statement was established in October 1989, revised November 2013, and revised March 2015.]