The number of programs participating in a QRIS is a key indicator of system functioning. The total number of programs participating and the density of participation (the percentage of eligible programs participating) varies depending on factors such as the length of time the system has been operational, whether QRIS participation is voluntary or mandatory, which types of programs are eligible to participate, and incentives for participation. This fact sheet summarizes QRIS participation in 2016 by program type and quality level. (author abstract)