In some legal systems, the partners in a marriage are "jointly liable" for the debts of the marriage. This has a basis in a traditional legal notion called the "Doctrine of Necessities" whereby a husband was responsible to provide necessary things for his wife. Where this is the case, one partner may be sued to collect a debt for which they did not expressly contract. Critics of this practice note that debt collection agencies can abuse this by claiming an unreasonably wide range of debts to be expenses of the marriage. The cost of defense and the burden of proof is then placed on the non-contracting party to prove that the expense is not a debt of the family. The respective maintenance obligations, both during and eventually after a marriage, are regulated in most jurisdictions; alimony is one such method.