**6. Conclusions**

The purpose of the chapter review was to view the trends in the methods and attempts made to develop them for recording EDA parameters. It was focused on the major methods (through some published literatures) used for recording EDA parameters. In addition, identifying the advantages of simultaneously recording EDA parameters at the same skin sites over sequential and alternate methods. Even though sequential or alternate recording methods certainly have advantages in some routine work, simultaneous recording method must be considered for future EDA research, since this measuring system can realize measurement of various EDA parameters on the human skin, at the same skin site and same time, which is required for accurate EDA research studies as well as clinical applications. This will in turn undoubtedly lead us to technological and clinical advancements in the treatment of other neurophysiological disorders. Therefore, simultaneous recording method is superior to sequential and alternate recording methods.
