Under the amended Rule 37A and case management regime, both parties bear primary and mutual responsibility to prepare properly, comply with court rules, and act professionally in expediting matters toward trial. This mutual obligation requires meaningful engagement between parties regarding trial readiness, not merely perfunctory completion of forms or technical point-taking. The filing of a late amendment after traditional close of pleadings and after a trial date has been allocated does not automatically alter the procedural stage of "close of pleadings" for case management purposes. When a party seeks an indulgence by way of a late amendment that affects trial readiness, that party bears responsibility for consequential delays and wasted costs. Courts will apportion wasted costs to reflect each party's proportionate contribution to a matter's removal from the trial roll, giving effect to the mutual obligations imposed by case management rules.