Here an attempt is made at summarizing the presentations, most of which were
about the highest energy particles observed in nature. Particular attention is
paid to the solutions to the Ultra High Energy Cosmic Ray particles, to the new
and forthcoming data, to the new proposals for experiments and to the role of
primary composition, that were amongst the most discussed subtopics.Comment: 19 pages, LaTeX, aipproc, Summary talk given at the International
Workshop on Observing UHECR from space and earth, August 9-12-2000, Metepec,
Puebla, Mexic