implement

I was surprised that even a “simple” thing like an interactive PDF was considered difficult to use.  Each person that trialled this needed information and some coaching about how to use it.  Once that was done they found it easy enough to use and worked through the PDF quite well.  I think they realised after a while that it was simply a different way of looking at, or doing, the same thing they are used to.

looking at the sky through the water