The paper presents a case study carried out with a group of Czech technical secondary school students (age 17-18) the aim of which was to study if it is practicable and appropriate to implement student's e-portfolio based on Mahara system into their school work, how the students can apply it in their teamwork projects, if a student's e-portfolio can be benefit for his/her school work and self-evaluation and in which ways students deal with his/her e-portfolio at home in preparation for school. The case study was focused on feedback and reflection integration into a student's e-portfolio and on students' understanding of assessment ad reflection.