Checks may also be appropriate on company websites to view the company’s portfolio and the type of work and projects that company have previously undertaken.
Efallai y byddai'n briodol gwirio gwefannau'r cwmni hefyd i weld ei bortffolio a'r math o waith a phrosiectau y mae'r cwmni hwnnw wedi'u gwneud o'r blaen.