PAYT schemes have already been used for decades. Several studies have shown that in comparison to flat-rate schemes they significantly improve recycling results, reducing the amount of waste produced and particularly that of unsorted waste. A vast literature was already produced about PAYT models. KAYT models, although more recently developed, already have a significant body of knowledge. This interactive map serves to orientate you among the main published documents through a tagging system that will help you find the most useful references for your specific questions.