3.3. Procedure
The whole process was conducted in the presence of the current school teacher in every class. A pilot and a main study were performed
following exactly the same procedure as it is described below. Each group dedicated 45 min or one school hour to the process. The first
group, i.e. the control group, came to class, discussed with the visitor-investigator the concepts for fifteen minutes, and then was asked
to fill the questionnaire on paper sheets. The second group, i.e. the experimental group, came to the computer lab and was briefed on
the procedure for the ‘‘experiment”. Each one of the students was seated in front of a computer and was given headphones in order to hear
without any interruptions the fifteen-minute introduction of the application. A period of time was given to the students in order questions
regarding the functions of the application to be answered by the investigator. And finally, with the headphones each one of the students
answered the questions on his/her own. The answers of each student were stored in*.txt form on the hard disk of the respective computer.