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Not AvailableDesign Resources Server has been strengthened by uploading a link on Block Designs with Factorial Structure. For the experimental situations wherein experimental units are used for a series of tasks one after another in the experimental conditions whose levels are difficult to change, two classes of nested designs involving sequences of treatments with same number of experimental periods and units have been obtained. A method of construction of second order rotatable response surface designs in the presence of neighbour effects has been developed. Estimators of both domain and population totals for an item of interest were developed under two-phase sampling where the domain identity was realized, but the item response was not necessarily available from a phase I sampled unit. An approximately unbiased estimator of the variance of ratio estimator under the two-pase sampling has been developed.Not Availabl