He has taught the assertion-evidence approach to scientific presentations on four continents, in sixteen countries, and at more than 150 companies, laboratories, and universities. Currently, he collaborates with other instructors to teach larger workshops, with the numbers of participants running from 25 to 150. Clients include Texas Instruments, Simula Research Laboratory in Norway, the Engineering Ambassadors Network, and Shanghai Jiao Tong University. The training, which calls on participants to prepare, deliver, and receive a critique of an assertion-evidence talk, usually runs two days. However, Alley still gives one-hour seminars and half-day workshops that focus on assertion-evidence principles.