Strengthening question

[MsPippi]

Hello! I am enjoying learning Swedish with Duolingo, it is a great system. I have one question, though. Sometimes when I do the exercise to strengthen my vocabulary, I do rather poorly at first, perhaps just getting one or two correct answers. But nevertheless, my strength bar gets filled. I am wondering if it might make more sense to have a minimum number of correct answers before the strength bar gets filled. That way, I don't get credit for something I didn't really do. What do you think about that? Thanks!

[superdaisy]

The word strength algorithms are a little opaque. This post has some good explanations and discussion.

[MsPippi]

Thanks, this is really interesting!