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A model is presented describing decision processes of a living system at the level of the individual, together with its interpersonal relationship context (organism, subsystems, and suprasystem). The beginning point was the 1977 system dynamics model of Wegman, which was itself characterized by quantitative cross-level hypotheses concerning both physiological and psychological levels of functioning within the individual personality system. The extension process was accomplished by synthesizing concepts from many different theories in personality and social psychology into equations linking two multiple-loop feedback systems to form a suprasystem. Each individual model was found to have several distinct operational modes, and the dyadic model had a number of interesting combinations of these modes which correlated with clinical descriptions of steady-state behavior and subjective experience in human marital dyads. For example, under certain conditions an individual operating in an unstable mode could achieve personal system stability within a dyadic relationship. In some cases, two unstable individuals could form a stable system. The process of extending the original model supports the utility of a synthetic approach to the construction of quantitative theories concerning small social systems. This process also suggests new approaches to planning future empirical research on small social systems using methods more appropriate to the study of complex, dynamic systems.

Gálik R., Poláková Z., Boďo Š., Denker M., 2011. Analysis of the relations between some physical indicators of market eggs. Res. Agr. Eng., 57 (Special Issue): S1-S6.The paper discusses the relations between some physical indicators of market eggs of laying hens housed in conventional and enriched cage batteries. The measured results were evaluated by the multiple regression dependence method. They show that in the case of both the conventional as well as the enriched cages a statistically significant dependence exists between the eggshell deflection (dependent variable) and thickness, or the force needed for the eggshell destruction (independent variable). The respective P values are given in brackets (0.002 < 0.05; 0.03 < 0.05; 1.16 × 10 -10 < 0.05;8.31 × 10 -4 < 0.05); in the case of the conventional cage and enriched cage also a statistically significant dependence existed (3.81 × 10 -91 < 0.05; 3.86 × 10 -81 ; 1.27 × 10 -97 < 0.05; 3.46 × 10 -57 < 0.05) between the shell weight (dependent variable) and shell thickness, or egg weight (independent variable); in the conventional cage, statistical dependence also occurred between the eggshell weight and egg shape index, (1.07 × 10 -6 < 0.05), in the enriched cage this was on the verge of statistical significance (0.062 > 0.05); if in the conventional cage the eggshell thickness was increased by 1 mm, the shell deflection decreased by 0.08 mm, and if the force necessary for the eggshell destruction was increased by 1 N, the shell deflection decreased by 0.0003 mm; if in the conventional cage the shell thickness was increased by 1 mm, the shell weight increasee by 15.509 g and if the egg weight was increased by 1 g, the shell weight increased by 0.061 g. Our work brings further knowledge concerning the monitored characteristics and their mutual relations.