The survey assessed overall literacy and numeracy skills of adults (aged 16-65) in Wales (through English medium), and Welsh medium literacy skills of Welsh-speaking adults in Wales.
Asesodd yr arolwg lythrennedd cyffredinol oedolion (16-65 oed) yng Nghymru (drwy gyfrwng y Saesneg), a sgiliau llythrennedd Cymraeg oedolion sy'n siarad Cymraeg yng Nghymru.