Active members are those who clearly expressed their interest in joining the UISPP. They pay a yearly contribution; this allows them to become member, to adhere to commissions, to participate to the congresses organized by the UISPP and its scientific commissions, to have access to all service provided by the UISPP and to be eligible in the different organs of the UISPP. Membership of the UISPP is automatically cancelled in case of non-payment of the yearly contribution.