California Code, Government Code - GOV § 53248

(1) “Comparability of the value of the work” means the value of the work performed by an employee, or group of employees within a class or salary range, in relation to the value of the work of another employee, or group of employees, to any class or salary range maintained by a local agency, and shall be measured by the composite of the skill, effort, responsibility, and working conditions normally required in the performance of the work with other classes of employees.

(2) “Skill” means the skill required in the performance of the work, including any type of intellectual or physical skill acquired by the employee through experience, training, education, or natural ability.

(3) “Effort” means the effort required in the performance of the work, including any intellectual or physical effort.

(4) “Responsibility” means the responsibility required in the performance of the work, including the extent to which the employer relies on the employee to perform the work, the importance of the duties, and the accountability of the employee for the work of others and for resources.

(5) “Working conditions” means the conditions under which the work of an employee is performed, including physical or psychological factors.