⟩ Suppose if I am an employee who asked my supervisor about a flexible schedule and was told it was not an option for my job, May i try again?
Yes, you may try again. However, first consider why your proposal was denied previously. (If you don't fully understand the reason your proposal was denied, ask your supervisor to clarify the business or performance reasons.) Then review the guidelines and determine if you can build a case for an alternative that might work for your particular situation. Ask your supervisor/manager to consider your new proposal and to discuss other alternatives.
