Preparation Is Critical to Productivity
The old saying "well begun is half done" applies to meeting productivity. There is a direct correlation between preparation time and meeting productivity, specifically in the area of preparing materials and the agenda.

Source: A network MCI Conferencing White Paper. Meetings in America: A study of trends, costs and attitudes toward business travel, teleconferencing, and their impact on productivity (Greenwich, CT: INFOCOMM, 1998).