Cyfarfu'r Grŵp a chasglu tystiolaeth gan nifer o randdeiliaid sydd ynghlwm wrth addysg Cymraeg ail iaith gan gynnwys athrawon, disgyblion a rhieni. Mae adroddiad terfynol y Grŵp, Un iaith i bawb, a gafodd ei gyhoeddi ym mis Medi 2013, yn tynnu sylw at nifer o broblemau gyda’r dull presennol o ddysgu Cymraeg ail iaith ac  yn archwilio themâu rydym yn ymrwymedig o fynd i’r afael â hwy yn ystod y cam nesaf o’r gwaith o adolygu’r cwricwlwm a threfniadau asesu yng Nghymru.
The Group met with and gathered evidence from a number of stakeholders involved in Welsh second language education including teachers, pupils and parents. The Group’s final report One language for all, published in September 2013, highlighted many issues in the current approach to Welsh second language and explored themes that we are committed to addressing during the next stage of work in the review of curriculum and assessment arrangements in Wales.