All papers from ETSS 2021, both invited and contributed, will be reviewed by two or three experts from the PC. After a carefull refereeing process, all accepted papers will be published by CSP Press "Advances in Educational Technology and Psychology" ISSN 2371-9400, and will be submitted to EI Compendex, Thomson ISI (ISTP) and other major academic databases including Cambridge Scientific Abstracts (CSA) www.csa.com, Chemical Abstracts (CA) www.cas.org, Google and Google Scholar google.com, Institution of Electrical Engineers (IEE) www.iee.org for indexation.