The main role of this first report is to set out the theory of change for the service and, building on that theory, the framework that will be used in the next phases of the evaluation.
Prif swyddogaeth yr adroddiad cyntaf hwn yw cyflwyno theori newid ar gyfer y gwasanaeth ac, ar sail y theori honno, cyflwyno’r fframwaith ar gyfer camau nesaf y gwerthusiad.