Further advice on appraisal checklists, classroom observation protocols, guidance on what constitutes reasonable objective setting, teachers working time and duties guide and general guidance on dealing with workload with colleagues and individually can be found on ATL section and NUT section. (neu.org.uk)
W / r / t reasonable objective, of course it had this, too: searching a backpack for a piece of paper... this one is not hard to establish given the circumstances. (law.stackexchange.com)