It should be pointed out that in order to insure the most comprehensive indexes possible, liaison was maintained laterally between the NAAS and KONA 1 and the other regiments on the Eastern front. Full collaboration was effected also with OKH/GdNA. A system for exchanging current information, new interpretations, corrections, etc., operated smoothly, the data being passed by telegraph or courier depending upon the urgency of the item in question. Below the level of the NAAS, card index were extensively used; but they were less comprehensive, being only as complete as the company cover assignment permitted. Regarding the card index in general, Roessler made a significant and characteristic observation, emphasizing that while "the card indexes formed the indefensible material basis for evaluation, memory, experience and perspicacity of the individual evaluators lent the spark". Evaluation in the Feste was the matter of identifying and interpreting unknown traffic, the interception of which was its particular function. Some characteristics of Russian communications facilitating identification have been discussed in the preceding section. The systematisation of this work as carried on by the Feste Evaluation Sections showed how the identifying elements were studied at this level. The traffic identified by the Final Evaluation unit was reported to the NAAS, together with the tactical information derived from the messages. The findings guided modification of the cover towards dropping the less important traffic and placing more sets on the "interesting" circuits. The Evaluation Section in the FAK was apparently organized like that in the Feste, although the relative dearth of evidence available precluded drawing a close parallel. Presumably it differed in function from the Evaluation section in the FAK and worked on identified traffic as well. As in the case of the Feste, the basic document of evaluation was the network diagram, prepared by the Traffic Evaluation section. This diagram included all evidence by which the station in question had been identified (in the case of 5-figure traffic, the Blocknots and Chi-numbers) and other significant data. Apparently, as was the case of the Feste, this diagram parsed through various sections devoted to D/F evaluation, traffic analysis, work on unidentified traffics, content evaluation, and finally to fusion or final evaluation. The details of cryptanalysis performed by the field units are discussed in Russian Cryptanalysis. Because of the importance of the field in the total evaluation, however, it is pertinent to note here the organization and function of the sections carrying out this work at KONA level. The cryptanalysis in the NAAS was performed by a special section separate from the Evaluation and Traffic Analysis sections.