Population levels, business communities and RD&I infrastructure and assets vary, so each has developed a distinct Regional Economic Framework (REF).
Mae lefelau poblogaeth, cymunedau busnes a phresenoldeb seilwaith ac asedau Ymchwil, Datblygu ac Arloesi, yn amrywio, felly mae pob un wedi datblygu Fframwaith Economaidd Rhanbarthol unigryw.