Students are peeking the words
How can I forbid or limit students to peek a translation for a word? Or it would be useful to see which words students are peeking (I believe this would be even better). I find it unfair that some students accomplish the assignments without peeking, while other just type what they see, and it is counted as a successful accomplishing.
And how can I check if the lesson has faded? As far as I know I can see only if student passed the lesson. I thing there is no way to see if the lesson is still gold (please correct me if I'm wrong). The other point that if I see that every student has peeked the same word, than the word should be discussed to help them to remember it.
That is how Duolingo teaches. The more students review the sentences, the less they will have to "peek". The ones who "peek", as allintolearning said, will have to review more frequently to keep their skill sets gold. Getting wrong answers also prompts more frequent reviews. Getting correct answers without any "peeking" means your skill sets will stay gold longer.
To make sure students are keeping up appropriately--not peeking a bunch and then letting their levels get really low because of that--maybe you could ask for screenshots that have the date and time from the taskbar included (to be emailed or otherwise shared outside of Duolingo.) I don't know how I'd show you what I mean, but you could ask for a screenshot of their skill trees or a section of their skill trees, and to make sure they aren't fudging it by using the same screenshot over and over, make sure they screen capture the current date/time their computer will usually show in one of the corners.
when I started the topic I had realised that there is no solution for that, my point is to find a solution that duolingo team could easily implement. So far I believe that easiest and good enough solutiion would be to create some kind of report in teacher's interfaces where teacher could see the tree of the students incuding strength.