Except in the cases outlined below, an assessment of the impact of any proposed subordinate legislation must be considered when the options for the development of the policy are being considered.
Ac eithrio yn yr achosion isod, rhaid ystyried asesiad o effaith unrhyw is-ddeddfwriaeth arfaethedig pan fydd yr opsiynau ar gyfer datblygu’r polisi yn cael eu hystyried.