<prompt> Translate the following text to SwahiliExceptionbased TA systems, as the name implies, require pay period recording of arrival and departure times only if material variances11 from preestablished work schedules occur.  <response>: T amp; A mifumo ya msingi wa ubaguzi, kama jina linavyodokeza, inahitaji malipo ya kipindi cha kurekodi saa za kuwasili na kuondoka tu kama tofauti muhimu 11 kutoka ratiba za kazi zilizowekwa mapema hutokea. 