Soil behavior is complex and thus requires quantification by a reasonably good number of different engineering parameters. Consequently, the seismic piezocone test (SCPTu) is particularly well-suited to being an efficient and economical tool for routine site characterization because four independ-ent readings are obtained with depth by a single sounding: qt, fs, u2, and Vs. An overview on using all four of these separate measurements for evaluating soil engineering parameters is given, realizing in some cases that redundancy occurs when two or more readings are used to interpret the same geomateri-al parameter. The assessment of parameters and subsurface information herein includes: unit weight, soil type, relative density of sands, effective stress peak friction angle, undrained shear strength, effective yield stress, and stiffness.