If the musician-actors do not provide a positive or negative response to the stage coordinators before the response-expiry date, their status will be recorded as "No Response". This status is evaluated at the end of the concert season. If they are recorded as "No Response" for three or more calls, they will not be contacted again for the following concert season, their name will be recorded as Black List and removed from the register list for next season.

If you contact your stage coordinator before the response-expiry date to inform them that your decision is not yet certain, your status will be recorded as Thinking. If the expiry date passes and you still have not provided a positive or negative response, your status will be changed to No Response. If you contact your stage coordinator after the response-expiry date to confirm your participation, your status will be recorded as Confirmed Late.

If you inform your stage coordinator before the response-expiry date that you are unable to participate, your status will be recorded as Unavailable. If you are marked as Unavailable for two or more calls within a single concert season, you will be contacted again at the end of the season, and your participation status will be re-evaluated for the next concert season.

If you contact your stage coordinator before the response-expiry date and confirm that you will participate, your status will be recorded as "On Stage". This means that you have been accepted into the main roster for your instrument on stage.

If you contact your stage coordinator after the response-expiry date or after the stage quota has been filled and provide a positive response, your status will be recorded as Confirmed Late. This means you will be assigned to your instrument group—or to another instrument group—only if there is a specific need. - IMPORTANT: Stage coordinators follow this process with great care. Since seats in some instrument groups fill very quickly once the concert date and time are announced, while other groups may still have openings, the Confirmed Late status has been designed to allow as many musician-actors as possible to participate and enjoy the experience.

If a musician-actor contacts their stage coordinator and states that they can no longer perform with SL ISO for any reason, their status will be recorded as Left With Notice, and their name will be removed from the next concert registration list. If they wish to return in the following season, they must reapply during the SL ISO application period.