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• Initial Test Pile — One or more piles, which are not working piles, may be installed to assess the load carrying capacity of a pile.
• Kentledge — Dead-weight used for applying a test load on piles.
• Net Displacement — The net vertical movement of the pile top after the pile has been subjected to a test load and subsequently released.
• Routine Test — It is carried out on a working pile with a view to check whether pile is capable of taking the working load assigned to it without exceeding permissible settlement. 
• Safe Load — It is the load derived by applying a factor of safety on the ultimate load capacity of the pile or as determined from load test.
• Ultimate Load Capacity — The maximum load which a pile can carry before failure, that is when the founding strata fails by shear as evident from the load settlement curve or the pile fails as a structural member.
• Working Load/Design Load — The load assigned to a pile as per design.

Crosshole sonic logging is a method to determine the structural integrity of drilled shafts and other concrete piles. The CSL method is considered to be more accurate than sonic echo testing in the determination of structural soundness of concrete within the drilled shaft inside of the rebar cage