The teachers union, the ASTI, says it regrets any inconvenience to parents as a result of its industrial action.
17 thousand teachers are refusing to carry out any work outside of teaching hours as part of their rejection of the Haddington Road agreement.
Half day closures of secondary schools are now on the cards in order to facilitate parent teacher meetings.
General Secretary of the ASTI, Pat King says they are "painfully aware" of the impact the dispute is having on parents and students:
