You can make changes to your script while interviewing is in progress. New interviews will always start using the latest version of the script whereas interviews that are currently in progress will continue running on the older version. If an interview has timed out or has been stopped on the older version of the script and is restarted on the newer version, the interviewing program silently replays the interview until it reaches the point at which the interview timed out or was stopped. However, if you have added extra validation statements that now make some of the original answers invalid, the interviewing program will stop at the point at which the error now occurs and will wait for the respondent to correct the answer. The interview then continues from that point.