During lectures, students are passive learners who take the information in only one way: through their ears. With projects and group work, information is ingrained in different ways to help the different kinds of learners in a classroom: the visual learners, active learners and listeners.
Peer learning is beneficial to the students in a classroom because it gives them the opportunity to teach their classmates through discussions, hear from each others and share ideas. The main advantage of learning actively and from peers is the variety of different viewpoints.
Via Carlos Fosca
"According to a survey done at the University of Central Lancashire, over 25 percent of students admitted to having left class at the mid-session break at least once during a lecture.
Though there are some benefits to lecture-based learning in a classroom, those same positives are reflected in peer learning. The most helpful part of lectures is that they allow for the transmission of large amounts of information to large groups."