Governments since the early 1990s have also encouraged "mixed tenure" in regeneration areas and on "new-build" housing estates, offering a range of ownership and rental options, with a view to engineering social harmony through including "social housing" and "affordable housing" options. A recent research report has argued that the evidence base for tenure mixing remains thin. Social housing occupants may be stigmatised and forced to use a poor door that is separate and less convenient than the door the unsubsidised occupants use and social housing may be less desirably situated.