working on course activities, writing assignments and perhaps working with other students through interactive teleconferences. Online learning can be an isolating experience since the student spends the majority of their time working by themselves. Some learners do not mind this kind of solo learning, but others find it a major stumbling block to the successful completion of courses. Because of the potential difficulty of maintaining the schedule needed to be successful when learning online, some virtual universities apply the same type of time management as traditional schools. Many courses operate to a timetable, which the student receives with the course materials. These may include the planned activities for each week of the course and due dates for the assignments. If the course has an exam, the students will be informed where they have to go to write it. An example of a university that maintains a tight schedule is the Virtual Global University (VGU) in Germany. VGU offers a graduate program "International Master of Business Informatics" (MBI)—a master program in information technology and management that takes an average of four semesters to complete (for full-time students). Each course has a lecture or a virtual class meeting every week. Afterwards, students get a homework assignment; for example, they have to solve an exercise, elaborate on some problem, discuss a case study, or take a test. Lecturers give them immediate feedback, and one week later, the same happens again. Coursework can be the same for a Virtual University as the On-campus University in certain cases. NYU Tandon Online, for example, provides the same course work to its online students as the on-campus students at the NYU Tandon School of Engineering. This is done using advanced technologies. Teaching modes When online courses first began, the primary mode of delivery was through a two way audio-visual network. Then as well as now, many of the virtual study programs were mainly based on text documents, but multimedia technologies have become increasingly popular as well. These web-based delivery modes are used in order to expand access to programs and services that can be offered anytime and anywhere. The spectrum of teaching modes in virtual education includes courses based on hypertext, videos, audios, e-mails, and video conferencing. Teaching on the web through courseware such as WebCT and Blackboard are also used. See Virtual education. Quality Students taking "virtual" courses are doing real work to get their degrees,