N-1-1-040.10 Internet Activities Board (IAB), Vint Cerf*, Apart from its regular standards-review activities, the Internet Activities Board has been paying increasing attention over the last year to architectural imperatives brought on by the rapid expansion and diversification of the Internet. During the summer of 1991, an architectural retreat was convened by the IAB and hosted by the San Diego Supercomputer Center, at which members of the IAB, the Internet Engineering Steering Group (IESG) and a few invitees debated and explored the future needs of the Internet at all levels of the protocol hierarchy. Many important requirements were recognized, but among the most pressing were: the need to scale to over one billion (10**9) networks; the need for a high-quality security architecture; the need for a common, well-maintained and populated "white pages" directory service. A second retreat has been scheduled in early January in Boston, Massachusetts. The Internet Activities Board announced in early December that Lyman Chapin would assume the chairmanship of the IAB in January, 1992, when the present chairman, Vint Cerf, steps down to devote his attention to the needs of the Internet Society. The IAB also accepted, with regret but with a great deal of appreciation for his service, the resignation of Dr. David D. Clark. Dr. Clark served as chairman of the Internet Activities Board from its inception until 1989, as chairman of the Internet Research Task Force from July 1989 to January 1992, and has been a productive contributor to the TCP/IP protocol suite development for over a decade. *Vice President, Corporation for National Research Initiatives