First results of the COSY-11 collaboration are presented in this paper
. The motivation for the investigation of meson production is discusse
d. The description of the COSY-11 experimental apparatus, including th
e method of particle identification and luminosity monitoring will be
shown. Preliminary results of first test measurements for the producti
on of (pi(+) pi(-)), eta,eta', and (K+K-) mesons in the p+p interactio
n will be given. Furthermore,the results of a test for the pp --> pK()Lambda reaction is presented.