In the margins, write only questions.

In the margins, engage with the writer's ideas, not with grammar or format.

Write an endnote to sum up your impressions and offer advice for revision.

Write a letter to the student describing what you see happening in the paper.

Talk about the paper in a conference; begin with the student's questions or concerns.

Read the paper aloud, stopping to respond where appropriate, into a tape recorder.

Ask the student to respond in the margins to her own paper; respond to those responses.

Ask the student to identify the paper's strengths and weaknesses in a short "cover memo"; respond only to those things the student identifies.

Ask the student to write a list of questions/concerns for you to respond to.

Swap papers with a colleague.

Have students peer review papers.

Have groups compile lists of strengths and weaknesses in the papers, which you then discuss.

Give students specific questions/prompts to guide response.

Have a mock-workshop or demonstration, in order to teach students how to respond effectively.

Incorporate workshops into the design of the course.

Ask students to give you feedback about the success or failure of each workshop.

Doubting/Believing Game 
As a homework assignment, have each student take home another student's paper and respond to it in letter format.