(a) actual progress is too slow to complete within the Time for Completion, and/or
(b) progress has fallen (or will fall) behind the current programme,
Other than as a result of a cause listed in Clause 11, then the Project Manager may instruct the Contractor to submit, under Clause 3, a revised programme and supporting report describing the revised methods which the Contractor proposes to adopt in order to expedite progress and complete within the Time for Completion.