Since I became Comptroller General, one of the most important activities in which GAO has been engaged is the development of its first strategic plan for the 21st century.
The GAO is not involved in strategic planning.
mnli hypothesis: The GAO is not involved in strategic planning. premise: Since I became Comptroller General, one of the most important activities in which GAO has been engaged is the development of its first strategic plan for the 21st century.