Design and analysis methods for use in the design of groups of laterally loaded drilled shafts are reviewed. The methods in current use are primarily adapted from methods developed for driven piles, and very little data is available for validation of these approaches which is specific to drilled shaft groups. The available data for drilled shafts are reviewed within the context of drawing conclusions about the adequacy and validity of currently used design methods and their corresponding reduction parameter recommendations for drilled shafts. Statistical methods are used to identify parameters for use in p-multiplier and group reduction factor approaches, and compared with values currently used or recommended in common design standards. The potential contribution of the pile cap is found to be very significant, and calculation methods for this contribution are reviewed.
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