To introduce that effort, however, several characteristics of the symbolic approach to congregational study are here set forth that distinguish it from the other principal modes of analysis. (religion-online.org)
They therefore used data from the London Area Transport Survey and London Travel Demand Surveys to calculate the number of journeys made in London — as well as distance and principal mode of travel — before (2001 - 4) and after (2005 - 9) the scheme was introduced. (sciencedaily.com)
The principal mode of variability of the atmospheric circulation in the SH extratropics is now known as the SAM (see Figure 3.32). (ipcc.ch)