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Problem Based Learning is a teaching method used to facilitate student knowledge acquisition. This teaching method is often confused with Project Based Learning, which centers on students applying knowledge. The focus of Problem Based Learning is students acquiring the knowledge. Since the two methods use the same acronym, they are easily confused, but have different objectives for students.

Hosting a guest speaker is not only a great pedagogical tool; it’s also a vivid example of the ways one mode of interaction can enrich the other in a multimodal course. Guest speakers can participate in a class synchronously (e.g., by participating in a synchronous session via online conferencing tools or in person) and/or asynchronously (e.g., by recording video or participating in asynchronous discussion boards). Students find asynchronous guest speakers easier to access, while synchronous speakers offer more opportunities for back-and-forth interaction between students and the guest (Alebaikan, 2016).