Of the emails you do open, roughly how many do you think COULD apply to your teaching? *
This question tries to establish the relevance of tips that are sent out to your particular context, given that some teachers in a department will be interested and others won't be. So, for example, 2 out of 4 members of a department might find a tool useful, where 2 do not. Therefore, the tool COULD be useful in that subject area.