Madison Teachers, Inc. Solidarity Newsletter (PDF), via a kind Jeanie Kamholtz email:

The District is currently experiencing a shortage of substitute teachers, which has led to a high number of unfilled assignments when a teacher or SEA is absent. As a result, many principals are asking teachers and other professional staff to cover for the absent teacher. When this occurs, members of MTI’s “Teacher” Bargaining Unit are likely to qualify to receive “class coverage compensation.” Class coverage pay is $22 for each hour of covering another teacher’s students. The Contract mandates that in the event a teacher’s absence cannot be covered by a substitute, volunteers must first be solicited to cover the classes. If no volunteers come forward, the building administrator can assign other certified staff.
Compensation for class coverage is provided by Section III-R of the Collective Bargaining Agreement and is paid under the following conditions: