The Thesis reviews the general analysis of Cylindrical Isotropic Shell Roofs by the application of the Theory of Elasticity , and the effect of Prestressing on the various Internal Forces and Displacements. A Systematic Method , based on the above mentioned principles , is presented for the design of Ordinary and Prestressed Reinforced Concrete Long Cylindrical Shell Roofs with or without Edge Beams. Simplified Elastic and Plastic Methods are also surveyed for the purpose of quick designs. The design of a Prestressed Reinforced Concrete Cylindrical Shell Roof Model with Vertical Edge Beams : 20' length x 8' width x 3/4" thickness of shell, is carried out by the simplified methods 9 and then a complete check of stresses by the suggested systematic method. The Model was constructed by casting 16 Reinforced Concrete Segments with one zink lined timber Mould, assembling them together, casting the End Stiffening Beams, passing the high tensile steel wires through previously prepared holes in the Edge Beams and then applying the Prestressing Force by stretching the wires. The test was carried out by loading the Model uniformly with sand sacks until destruction. The Ultimate Load which caused the splitting of the Segments was 220 lbs/ft [squared] of the curved surface. Electric Strain Gauges and Metzger Gauge Points were provided at various points on the outer and inner surfaces of the Model for measuring the strains by using the Savage & Parsons 50 Way Static Strain Recorders and the 8" & 2" Metzger Gauges. The radial deflections were measured by Mercer Dial Gauges. The test results for stress components and radial deflections quite agree with their corresponding theoretical values obtained from the suggested design method.