Quality of recyclates will remain the linchpin on which the economic viability of recycling turns, says the Waste & Resources and Action Programme (WRAP). In WRAPs review for 2006 07: Waste, society and climate change making a difference, it highlights the importance of economic viability in terms of the quality of collection services provided and the quality of materials collected by local authorities and their waste management companies. It has recommended to local authorities and their waste management companies that kerbside sort collections are the most cost effective method in delivering better quality materials to the marketplace. However, it acknowledges that authorities with narrow streets and high density urban areas may opt for commingled systems, even though it may lead to higher yields of lower quality materials. With local authorities having to deal with a higher volume of recyclable materials, material recovery facility technology is also being reviewed by WRAP in the drive to produce quality materials. Speaking at WRAPs open meeting chief executive Liz Goodwin said: Quality really does underpin the sustainability of recycling. We have got to improve the quality of material being collected either through increased kerbside sort or improving the performance of materials recycling facilities.