[edited from support email]
I recently added a new questionnaire to a pre-existing media lab experiment and after running about 10 people discovered that the new data are not aligned the same way anymore in SPSS or Excel. I thought it would just save the new variables to the end and/or in alphabetical order and insert missing values for those who did the study without the added survey, but this was not the case. Is there any way to use the new cases? Or perhaps (in the future) find a way to add surveys to an existing experiment without having to delete the data file and starting over?