The Equal Pay Act of 1963 prohibits discrimination on the basis of sex in the payment of wages or benefits, to men and women who perform substantially equal work for the same employer, in the same est

Effort is explicitly one of the four statutory factors under the Equal Pay Act, referring to the physical or mental exertion required to perform the job.

Working conditions is explicitly one of the four statutory factors, encompassing surroundings and hazards of the job environment.

Skill is explicitly one of the four statutory factors, referring to experience, training, education, and ability required to perform the job.

The four factors the Equal Pay Act uses to assess substantially equal work are Skill, Effort, Responsibility, and Working Conditions. Education is not one of the four enumerated factors - it is not part of the statutory framework used to compare job content under the Act.