text: results provided by the system, has significantly expanded the tasks of the EIDCs. There is a saying that he who makes a journey has something to tell. This also applies to those who make scientific experiments. You thereby create new knowledge which is otherwise not available. Such valuable experience was gained at the experimental international data centres during the recent test period. It was found that the work-load was much heavier than expected and that the internal operations of the EIDCs have to be streamlined to allow for continuous operation over an extended period of time. To utilize the full potential of the wave-form data, the seismological methods and procedures have to be further developed and tested. Co-operation among the EIDCs to arrive at a common solution, a process usually referred to as reconciliation, is an important element of the analysis procedure. This was, however, not tested during this initial phase, mainly due to the overload at the EIDCs. In the light of the experience accumulated so far, the Group revised its preliminary plans and instructions for GSETT-2, and agreed on a revised schedule which is annexed to the progress report. During the time period until the Group's next session, phase 2 of GSETT-2 will continue with a number of activities, gradually building up to the envisaged full-scale operation of the system to be tested. These activities include the establishment of new national data centres in countries joining GSETT-2 and the establishment and testing of appropriate communication channels between these NDCs and EIDCs. Also included is work to improve the seismological procedures at EIDCs for analysis of wave-form data in particular, and the testing of such procedures among the EIDCs. An informal meeting of experts primarily from the four EIDCs will be hosted by the United States in early June 1990 to review the results of this work. A 
analysis: The text appears to be discussing a scientific experiment or project, specifically related to seismology and the analysis of wave-form data. The language used is technical and focused on the operational aspects of the experiment, including the need for cooperation among international data centers and the testing of procedures. This suggests that the category is likely related to science and technology.