Video / Film Projection
Clear caption cards are helpful.
A steady camera, which does not move to rapidly is less distracting to the audience.
Training Productions need to concentrate on essentials, so that the audience has time to assimilate important facts and skills.
Interesting material can be built in, but not particularly whilst relevant information is being digested.
People need time to relate differing aspects if the total Production, whilst maintaining concern about the immediate detail.