Eighteen more colleges have joined the initiative, bringing the total to 86. Together, they are pledging to increase the number of lower-income students at top colleges by 50,000 (or more than 10 percent) by 2025.The new members include the University of Delaware, Haverford, Case Western and five University of California campuses. I was pleased to see both the University of Wisconsin (one of the country’s least economically diverse public universities) and Washington & Lee University (one of the least diverse private colleges) on the list. Existing members of the initiative include 12 flagship state universities, the entire Ivy League, Stanford, Caltech and N.Y.U.