AUGUSTA — Updated plans showing progress from Maine’s 290 school districts working to reorganize into 80 units are due Friday.

The Department of Education is asking the proposed regional-school units to submit revisions by Friday to the plans they last filed in December with the department. School districts are reorganizing to comply with a law passed last year aimed at shrinking the number of Maine school districts to cut administrative costs.

While a number of districts intend to file updated plans, other units that have not taken major actions since the December submission are sending letters to the department instead explaining why they have been unable to act.