IIT Madras follows structured code letters for the number of credits of every course. A credit structure is represented using the format L–T–E–P–O–C. These letters indicate the different components of academic workload and the approximate number of hours you are expected to spend on the course every week.
The codes represent the following:
L (Lectures): Classroom teaching hours conducted by the instructor
T (Tutorials): Tutorial or problem-solving sessions
E (Extra): Additional academic activities such as assignments
P (Practicals): Laboratory or practical session hours
O (Others): Time expected for self-study, projects, coursework, revision, seminars, etc.
C (Credits): Total credits assigned to the course
For example, consider the course:
MA1101 – Functions of Several Variables with the credit structure:
3 – 1 – 0 – 0 – 6 – 10 (as per curriculum)
This is interpreted as:
3 - hours of lectures per week
1 - hour of tutorial per week
0 - extra/guided activity hours separately counted
0 - practical/lab sessions
6 - hours of other academic effort, mainly self-study, assignments, practice, and revision
Giving a total of 10 credits/workload hours per week
So, even though you attend only 4 direct contact hours (3 lectures + 1 tutorial), the institute expects you to spend additional time outside the classroom to understand the course requirements and complete them. The distribution is as stated, but it depends on you and your learning pace to determine whether you wish to spend more time than that or less. And this is why higher-credit courses usually demand consistent weekly effort beyond just attending classes.
For more questions about the credit system at IIT Madras, visit AskIITM Community.