  Despite a significant improvement in the educational aids in terms of
effective teaching-learning process, most of the educational content available
to the students is less than optimal in the context of being up-to-date,
exhaustive and easy-to-understand. There is a need to iteratively improve the
educational material based on the feedback collected from the students'
learning experience. This can be achieved by observing the students'
interactions with the content, and then having the authors modify it based on
this feedback. Hence, we aim to facilitate and promote communication between
the communities of authors, instructors and students in order to gradually
improve the educational material. Such a system will also help in students'
learning process by encouraging student-to-student teaching. Underpinning these
objectives, we provide the framework of a platform named Crowdsourced
Annotation System (CAS) where the people from these communities can collaborate
and benefit from each other. We use the concept of in-context annotations,
through which, the students can add their comments about the given text while
learning it. An experiment was conducted on 60 students who try to learn an
article of a textbook by annotating it for four days. According to the result
of the experiment, most of the students were highly satisfied with the use of
CAS. They stated that the system is extremely useful for learning and they
would like to use it for learning other concepts in future.
