Final answer:
The statement that the General Schedule pay scale is used within the United States civil service is true. This pay scale features fifteen grades and allows for progression in both steps and grades with increased experience and education.
Step-by-step explanation:
The General Schedule (GS) pay scale is indeed used within the United States civil service, making the assertion in the question true. The GS is a widespread pay scale with fifteen grades, each comprising ten steps. The different grades require varying levels of education and experience. As employees progress through their career, they can ascend both steps within a grade and advance to higher grades, reflecting their increased competencies, skills, and experiences. Furthermore, the Civil Service Reform Act of 1978 established the Office of Personnel Management, which oversees the competitive service positions, and the Merit Systems Protection Board, not a "spoils system" or the General Schedule itself.