The paper read by F. Ackermann dealt with the main contents of his thesis concerning a comprehensive theoretical study of the precision of strip-triangulation and strip-adjustment, as depending both on the quantity and distribution of control points, and the adjustment method applied. The paper elaborated first on the theoretical foundation and the scope and method of the investigation, which was restricted to the effect of random errors in the classical problem of strip-triangulation, i.e. aeropolygon-triangulation of long strips with scarce ground control. With the help of a number of graphs the precision of strips after least squares adjustment was demonstrated, for various cases of control distribution. It was pointed out that, as a general rule, the precision obtainable with long strips depends in first instance only on the bridging span between control points; the number of spans, in case more than 1, being of very little influence. In addition it was shown that the unfavourable error-law of strips (errors increase with the power 1.5 of the strip length) is preserved throughout the adjustment for all control patterns separately. In the same way the precision of strips after adjustment with polynomials of various degrees was shown. Comparisons were made between the adjustments with polynomials of different degrees and with the least squares adjustments. It turned out that in the cases usually encountered in practice (2 or 3 groups of control points) least squares adjustments are almost equivalent to the simple polynomial adjustments. With increasing number of control points, however, the superiority of least squares adjustment becomes more and more evident, the precision obtainable with polynomials of higher degrees deteriorating rapidly. The theoretical investigations referred in first instance to the effectiveness of double summation errors, which are predominant in long strips. The effects of both single summation errors and of local independent coordinate errors were also studied, but in a less general and less complete way. The author reported finally about statistical tests which are being made in order to check whether the theoretical results are confirmed by practical strip triangulations and strip adjustments. First results of such tests were shown. The complete investigation will soon be published in German in: Deutsche Geodätische Kommission, Reihe C. A somewhat abbreviated version will be published in English in the series A of the ITC Publications.