The Role of Classroom Assessment in Teaching and Learning Share Close Share Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Share on Google Plus Permalink Email Lorrie Shepard January 1, 2001 Publisher: Washington, DC: American Educational Research Association Resource Document Expand Download Print Share Share PDF: Why is Facebook not here? Why is Twitter not here? Share on LinkedIn Share on Google Plus Email Download or Print Permalink Copy Link Embed PDF: Copy Embed Code