1. Government Accountability Office (GAO). (2011). A Guide to Key Performance Measurement Terms (GAO-11-646SP). Washington, D.C.
Page 10: Defines an output measure as "A measure of the quantity of goods and services produced by a program." This directly supports the correct answer.
Page 9: Defines an outcome measure as "A measure of the results, effects, or consequences of a program’s outputs," which distinguishes it from the correct answer.
2. Governmental Accounting Standards Board (GASB). (1994). Concepts Statement No. 2: Service Efforts and Accomplishments Reporting.
Paragraph 55c: States, "Measures of the quantity of a service provided are referred to as output measures. For a fire department, for example, an output measure might be the number of fires extinguished... For a public school system, an output measure might be the number of students taught."
3. Hatry, H. P. (2006). Performance Measurement: Getting Results (2nd ed.). The Urban Institute Press. (This is a foundational academic text in public administration performance measurement).
Chapter 2, Page 14: Defines outputs as "The amount of service provided, or the number of products produced by a program." It distinguishes this from outcomes, defined as "The substantive results of the program for its customers and the community."