An actuary is a statistician who computes insurance and pension rates and premiums on a basis of experience tables. The tables are organized statistical data with indicates such things as the life expectancy of a person sometimes referred to as morality tables and which tables are admissible in a court of law as evidence. The social security administration would use actuarial tables to determine the appropriate benefits to be awarded a claimant and/or the appropriate backpay that might be awarded. SSA maintains an Office of the Chief Actuary which plans and directs a program of actuarial estimates and analyses relating to SSA retirement programs, survivor programs, and disability insurance programs. The office also oversees all proposed changes to such programs.