The doctrine of tracing: A change in form of the asset does not change ownership. Commingling by itself does not change the character of separate property to community property. The party seeking to establish separate property status has the burden of uncommingling the funds into separate and community shares. When withdrawals have been made from an account with commingled assets, the drawer's intent test is used. This intent can be established by self-serving testimony even after the fact to establish drawers intent. However, mere evidence of intent to use separate funds will not suffice. Also the purpose for which the funds are used also determines the presumptions. See community property (family expense doctrine).