Previous investigation on persons with low back pain suggested that the PSFS has promising measurement properties. The results of this study provide further evidence supporting the reliability, validity, and efficiency of the PSFS. Further investigation is needed to determine the extent to which the PSFS can be applied across a variety of conditions and age groups.
Tour operators' performance and recent changes in air inclusive tours (AITs) are traced. The difficulties tour operators face are identified in the light of economic factors influencing demand and supply. Attention is concentrated on the impact of economies and diseconomies of scale, concentration, integration, legal liabilities, technological change and the general economic climate. Discussion of trends indicates that in the face of increasing competition, continuing excess capacity and market instability, tour operators are confronted by varying and challenging prospects into the next century.
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