In our laboratory and many clinics that perform it, we have several techniques that help us to choose the best sperm. We perform sperm preparation techniques like swim-up, density gradient centrifugation and lately we are also using more advanced techniques for selection of the sperm, like microfluidic techniques or the FertileChip. It allows us to choose the best sperm, and then we use more sophisticated techniques to inject the sperm to increase the chance of successful fertilization. IMSI is a selection of sperm under the high magnification on a microscope, in our clinic, it is MIC6600. PICSI allows us to choose the sperm that are functionally mature, it is based on the attachment of mature sperm to the hyaluronic acid, when the sperm attaches, the embryologist chooses the right sperm, it really can increase the fertilization rate.