Table 9. Answers to qualitative questions about communication, participation, role, and others during the project.

Category	Answer
Motivation	“I was able to understand my major effectively and found it interesting.”
	“It was even more fun to be able to encounter, experience, and gain knowledge while implementing the project.”
	“I wish I had thought more creatively.”
Communication	“Our group continued to communicate through group chat.”
	“I was able to learn the importance of communication throughout the project.”
	“The projects seems to be a good opportunity to cooperate and to respect each other’s opinions without ignoring them.”
	“I felt how important it is to give and receive feedback than to say that it’s always good.”
“The team members’ responses were late, due to a web meeting.”
Team work	“I learned a sense of cooperation.”
	“Team members actively participated during implementation project.”
	“I developed respect for team members through project implementation.”
	“I was having difficulty and team members helped me. Now, the content is well understood.”
Problem solving	“I want to improve my problem solving skills.”
	“The project has improved my problem solving ability.”
Understanding major	“I learned theory and hypothesis from the lecture but the project actually helped me to better understand my major by implementing knowledge into practice.”
	“If the investigation had been a little further earlier, it would have been possible to confirm the symptoms of many tree diseases.”
Environment	“Unfortunately, we were unable to conduct a face-to-face investigation due to COVID-19.”
	“Because the research time was short, it was difficult to research a lot of data, so I was disappointed that I could not include a lot of information in the presentation.”
	“I took self-directed learning and e-PBL method as an opportunity to better understand my course and learn more from my major.”
	“I realized one cannot learn in solo; therefore, this was a good opportunity to share and interact with others to learn more.”
Satisfaction with e-PBL	“I find e-PBL learning to be more helpful than the existing lecture-oriented learning method when acquiring diverse knowledge.”