Heinz Grohmann -- Hans Schneeweiss -- Heinrich Strecker -- Articles -- Least-Squares Index Numbers -- Stationary State Equations for Personnel Flows in Hierarchical Organizations with Entry at Lowest Rank and Promotion from Within -- Polynomial Entropy -- On the Formation of Statistical Models -- Estimation without Invariance and Hsu's Theorem in Variance Component Models -- Konzepte zur weichen Modellierung sozioökonomischer Zusammenhänge -- Statistical Modelling -- Methoden zur Messung der Schattenwirtschaft -- Searching for the Best Offer when the Distribution of Offers is Truly Unknown -- Fuzzy Weighting in Multiple-Objective Decision Making; the Contributions of Menges and Some New Developments -- Simultaneous Determination of Capital Flows, the Exchange Rate and Interest Rates in the Bonn Forecasting Model 11 -- C-Optimal Decisions with Optimality Properties for Finite Sample Size -- Prediction with Arima Filters -- Exploration and Inference -- Estimating Linear Relations with Errors in the Variables: the Merging of Two Approaches -- Einige Bemerkungen zum Konzept der Kohärenz -- The Estimation of Ratios and Related Quantities -- On a Concept of Asymptotical Risk in Survey Sampling -- Estimation of the Response Variance in Surveys -- Curriculum Vitae Günter Menges -- List of Obituaries -- List of Authors.