Margaret Voishan Palma (plaintiff) and John Voishan (defendant) were divorced in Maryland in 1981. Margaret and John had two daughters. Margaret was awarded custody of the children, and John was ordered to pay $250 per month in child-support payments. Four years later, that amount was increased to $1,400 per month. On March 8, 1991, Margaret filed a motion to modify child support because John’s income had increased to $145,000 per year. In determining child-support obligations, Maryland applies the income-shares model, which takes the income of both parents into account and requires that each parent pays his or her proportional share. Following a hearing, the judge found that John’s child-support obligation for his minor daughter should be increased from $700 per month to $1,550 per month. In making his decision, the judge reviewed the parties’ financial circumstances, considered the needs of the child, and then apportioned the reasonable expenses of the child. John appealed the decision.