These are the main issues in the contract dispute between the striking teachers and the D.C. Board of Education:

Working conditions: The board would make the teachers work seven hours a day instead of six, during a school year of 200 days instead of the present 186. Teachers would not be given additional compensation.

Salaries: Not a direct issue. The City Council and Congress set the pay scale for teachers. But the teachers argue that the proposed lengthening of the school day and school year without compensation constitutes a 33 percent pay cut.

Decision making: The board would limit the role played by the teachers union as well as that of teachers at individual schools. Teachers would have less influence in determing "school policy," which outlines what duties they shall be required to perform. School administrators, rather than teachers, would have final authority to determine students' grades, and the procedures under which teachers may now discipline students would be removed from the contract.

The board contends that discipline problems in schools affect parents and administrators as well as teachers and students, and has proposed that new procedures be worked out later in discussions involving representatives of all four groups. Teachers also would be required to attend parent-teacher meetings at the discretion of administra tors.

The union wants to create an "agency shop" in which teachers who are not union members would be required to pay a fee equivalent to union dues. The union says that it represents nonunion members at grievance hearings and should be compensated for it.

The union wants teachers to have the right to transfer to another school and to remove "adverse" materials more than three years old from their personnel files.It alsos asks that the board provide a substitute teacher for every absent classroom teacher to prevent overcrowding of other teachers' classes or having unattended students walking the halls.