Writing Workshop, just like any kind of workshop, includes these elements:
Time (to work, to think)
Vision (includes mentor text and teacher as writer)
Response (feedback from peers and from the teacher)
Tools (writers/readers notebook, anchor chart, tips/insights from published writers)
How do others define the fundamentals of writing workshop? The blog, Two Writing Teachers, can answer this question.
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Important to all instruction, including the reading, writing, or literature workshop-- is the classroom environment. Check out how Beth Lakin, a high school English teacher in Denver, has organized her classroom library to support her students' independent reading.