One question that was still open is the following: How can we guarantee data integrity for the grades, teachers reviews and comments?
The educational intstitutions are held responsible for this data and therefor should protect it from manipulation. A change in grading from 'bad' to 'exellent' must not remain undetected.
- Should signatures be calculated for this data based upon public and private encryption keys?
- Should (this part of) the portfolio be virtual and only hold references to the grading data at the website of the original source?
- Should there be a grading bank that holds and issues the data from a central trusted repository?
Is the answer for this problem already thought up elsewere? I am probably not the first one to think about this,... and hopefully not the last ;-)