Dear Milee, you have provided information about hiring trainees in your organization. However, what is your query? The only thing that I find anomalous is the usage of the word "stipend." A stipend is paid under the provisions of the Apprentice Act 1961. The minimum amount is decided and revised every year by the government. However, employers have the liberty to pay more than what is stipulated. Stipends are paid to apprentices. They are not employees, either regular or contractual. Provisions of the ESI Act are applicable to apprentices.
On the other hand, a salary is paid to employees. An employee could be regular, temporary, fixed-term, or contractual. The rules for payment of monthly salaries are governed by the Payment of Wages Act, 1936, Shops and Establishment Act, or Factories Act, etc.
In your case, you are not hiring apprentices under the provisions of the Apprentice Act; hence, the usage of "stipend" is improper. What trainees will receive is a salary.
Thanks,
Dinesh Divekar