In the United States, family laws and precedents as they relate to divorce, community property and alimony vary based on state law. Also, with new family models, "working couples", "working wives", "stay-at-home dads", etc., there are situations where some parties to a divorce question whether traditional economic allocations made in a divorce are fair and equitable to the facts of their individual case. Some groups have proposed various forms of legislation to reform alimony parameters (i.e. amounts and term). Alimony terms are among the most frequent issues causing litigation in family law cases. Eighty percent of divorce cases involve a request for modification of alimony.