In this webinar, methodological aspects of research with transcranial electrical stimulation (tES) will be briefly covered. Research with tES has grown exponentially in recent years, especially in the fields of systems, cognitive and clinical neurosciences, psychology, and rehabilitation sciences. However, there are variability in behavioral, physiological, and therapeutic responses to tES. The variability comes from both inter-individual variability and methodological flaws/discrepancy. We mention to some important methodological aspects that should be complied with in human research of tES.