As a general rule of thumb, the difficulty can be decreased if the child responds correctly to less than _____% of the training items. August 30, 2020 Speech As a general rule of thumb, the difficulty can be decreased if the child responds correctly to less than _____% of the training items. a. 15 b. 25 c. 40 d. 50 Answer: d. 50 Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+