Mae'r cynnwys hwn ar gael yn Saesneg yn unig.
The number of people in Wales claiming help from councils for homelessness has gone up for the second year running. Figures show more than 19,000 people said they had nowhere to live, a rise of about 27% on the previous year.
However, Cardiff University lecturer Dr Peter Mackie, who is also the chair of the WISERD Housing Thematic Group, told BBC Radio Wales that his own research suggests the actual figure of people homeless in Wales could be as many as 25,000.
You can listen to the whole interview by clicking here.