This research presents the methods in determination of pile quality and the two different related case studies. The first part of the research discusses the low-strain pile integrity testing, discontinuities and defects occurred during the construction along the piles. The pile integrity testing results of 96 piles were evaluated that were performed in the field and the mentioned testing method was also simulated using TNOWAVE: SITWAVE with the signal matching technique. The analyses were performed by matching the signal data obtained in the field with the reference signals created by the software for the determination of the pile quality. In the second part of the research, the hammer and pile properties were used as an input for the pile drivability analyses where in this case the inverse technique were applied in order to evaluate the static and dynamic soil properties as well as the accurate soil profile.