Release the first Player's Handbook 6 months after a 5th Edition (turn based only) video game and take player comments of the game and use them as a play test for the book material.
Or better yet, open a 5th edition online game for 6 months and let people play test on it for free. Change the rules and programing as comments continue to come in. Design the book material from it.
Or better yet, open a 5th edition online game for 6 months and let people play test on it for free. Change the rules and programing as comments continue to come in. Design the book material from it.