Editing ARPANET (section)

=== Network performance ===

In 1968, Roberts contracted with Kleinrock to measure the performance of the network and find areas for improvement.<ref name="Abbate20002" /><ref>{{harvnb|Hafner|Lyon|1996}}</ref><ref>{{Cite web |title=Leonard Kleinrock Helps Build The ARPANET |url=https://www.livinginternet.com/internet/i/ii_kleinrock.htm |access-date=2021-03-19 |website=Living Internet}}</ref> Building on his earlier work on [[queueing theory]] and optimization of packet delay in communication networks, Kleinrock specified mathematical models of the performance of packet-switched networks, which underpinned the development of the ARPANET as it expanded rapidly in the early 1970s.<ref name="Roberts1978" /><ref name="Gillies2000" /><ref name="Abbate20002" />