Much of the data for the other two bodies are based on the measurement of outputs similar to the number of digitised documents rather than the result of the impact of the work.
Mae llawer o ddata’r ddau gorff yn seiliedig ar fesur allbynnau tebyg i’r nifer o ddogfennau wedi’u digido, yw mesur nifer y dogfennau yn hytrach na chanlyniad effaith y gwaith.