The aim of the bulletin is to give an introduction to the range of options available and to help you make informed decisions about what sort of definition is appropriate for a particular task.
Nod y bwletin yw rhoi cyflwyniad i'r amryfal opsiynau sydd ar gael a'ch helpu i wneud penderfyniadau cytbwys am y math o ddiffiniad sy'n briodol ar gyfer gorchwyl penodol.