Variation of contract as a result of changes in how we deliver services, reduced services, efficiencies or and other needs.
Gall fod ar ffurf 'amrywio contract' oherwydd y newidiadau sy'n ofynnol o ran darparu gwasanaethau, cwtogi ar wasanaethau, gwneud arbedion effeithlonrwydd ac o ran gofynion eraill.