Tim Berners-Lee drew what he called the "metro": a diagram of the relationships between the existing systems (FTP, SMTP, HTTP, ...) in the form of a stylised map resembling that of the London Underground.

That made me think that we needed to deal with a lot more hard computer science than our small team of four or five could intellectually handle.

[5] The event was organized by Robert Cailliau,[6][7] a computer scientist who had helped to develop the original WWW specification, and was hosted by CERN.

[9] Dave Raggett showed his testbed web browser Arena and gave a summary of his first HTML+ Internet Draft.

[3] The Biological Sciences Division of the University of Chicago presented a web browser and HTML editor called Phoenix built upon tkWWW version 0.9.