Time study is not an exact science, and thus rating (the assessment of a worker’s rate of work) and the allowances to be given for recovery from fatigue and other purposes are still largely matters of judgement and therefore bargaining between management and trade unions.
Utafiti wakati si halisi sayansi, na hivyo rating (tathmini ya workerâ € ™ s kiwango cha kazi) na posho ya kupewa kwa ahueni kutokana na uchovu na madhumuni mengine bado kwa kiasi kikubwa ni mambo ya hukumu na kwa hiyo kujadiliana kati ya uongozi na biashara vyama vya wafanyakazi.