We do this by talking to the users, learning a little about them, then giving them scenarios and asking them to interact with the design.
Rydyn ni'n gwneud hyn trwy siarad â'r defnyddwyr, dysgu ychydig amdanyn nhw, yna rhoi senarios iddyn nhw a gofyn iddyn nhw ryngweithio â'r dyluniad.