Audience engagement and participation have been developing since the cultural upheavals of the 1960s, said Kristin Linklater, a professor of theater arts at Columbia.

WSJ: Culture City: Eats and Tweets in the Seats

The play's themes have been developing since Sept. 11, 2001.

WSJ: Bari Weiss: David Mamet's Coming Out Party

Fischer and Sheeley say they have been developing their Android applications since last November.

FORBES: Magazine Article

International banks have been reducing their loan exposure to developing countries since Brazil's crisis last year.

ECONOMIST: Riding for a fall

Ebb and Flow (which were named in a contest by elementary school students) have been circling the Moon since January 1st, developing a detailed gravitational map of the Moon.

FORBES: NASA Prepares To Crash Its Probes Into The Moon

There was also the potential for developing better cancer drugs, since polyketides have also been a fertile source of chemotherapy agents.

FORBES: Magazine Article

Since the story began developing earlier this week, Democratic House members and donors have been calling Gephardt repeatedly to gauge his intentions.

CNN: Sources: Gore campaign and Gephardt in 'serious' running mate talks