A. Definition of e-learning
E-learning is the learning process which created using digital media, internet technology and online media for interaction and delivery materials. E-learning also can be defined as systems capability to storing, managing, or, modifying educational content by interaction between participants in the systems. Participants can insert, alter, or delete data through e-learning or LMS.
Students can access course materials, assignment, academic operation information, and also participate in group discussion. Lecturer can interact with the students through discussion forum to give explanation about course material, and also guide the students to active in discussion forum by give triggering questions to the students. Nowadays, many universities use e-learning to improve the quality of teaching and learning process.
B. Benefits of e-learning
There are several benefits from e-learning as (1) easier to monitor the learning process because all of lecturer and students activities are captured in one Learning Management Systems (LMS); (2) cost saving for university because can reduce the funds for building and classroom; (3) cheaper for the students that can save time and money; (4) provide more instructor-student and student-student interaction than traditional systems; (5) and slow learners students can take advantage from e-learning because they can spend more time to reading the materials and participate in discussion forum than in the traditional classroom.
C. Usability of e-learning
Usability is the degree which product or system can be used by the users to achieve the goals in an effective, efficient, and satisfactory ways. Usability is very important for e-learning because if e-learning has a good function but do not have good usability, then users can’t used e-learning optimally and there will be possibility from the users to avoid to use it. High usability will guarantee e-learning can be used effectively, efficiently, safe to use, has a good function, easy to learn and easy to use for the users.
Fig 1. The Conceptual Framework 
From above figure, independent variables have strong affect to the usability of e-learning because users are the people that directly interact with e-learning, especially the students that need easily access and use of e-learning anytime, anywhere. In this research, we evaluate Binus University Online Learning. Continue to Part 3 of this article.
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