Sequential proportional approval voting

Sequential proportional approval voting (SPAV) or reweighted approval voting (RAV)[1] is an electoral system that extends the concept of approval voting to a multiple winner election. It is a simplified version of proportional approval voting. Proposed by Danish statistician Thorvald N. Thiele in the early 1900s,[2] it was used (with adaptations for party lists) in Sweden for a short period after 1909.[3]