 filters. Frequently Asked Questions How does Filter Cart Boolean logic work? The Filter Cart currently employs basic AND/OR Boolean logic. A single filter may contain multiple selections for that filter type, e.g., a single NDA Study filter might contain NDA Study 0 and NDA Study 0. A subject that is in EITHER 0 OR 0 will be returned. Adding multiple filters to the cart, regardless of type, will AND the result of each filter. If NDA Study 0 and NDA Study 0 are added as individual filters, data for a subject will only be selected if the subject is included in BOTH 0 AND 0. When combining other filters with the GUID filter, please note the GUID filter should be added last. Otherwise, preselected data may be lost. For example, a predefined filter from Featured Datasets may select a subset of data available for a subject. When combined with a GUID filter for the same subject, the filter cart will contain all data available from that subject, data structure, and dataset; this may be more data than was selected in the predefined filter for that subject. Again, you should add the GUID Filter as the last filter to your cart. This ensures 'AND' logic between filters and will limit results to the subjects, data structures, and datasets already included in your filter cart. What is a Filter Cart? Viewable at the top right of NDA pages, the Filter Cart is a temporary holder of data identified by the user, through querying or browsing, as being of some potential interest. The Filter Cart is where you send the data from your Workspace after it has been filtered. What do I do after filters are added to the Filter Cart? After filters are added to the Filter Cart, users have options to ‘Create a Package' for download, ‘Associate to Study Cohort', or ‘Find All Subject Data'. Selecting ‘Find All Subject Data' identifies and pulls all data for the subjects into the Filter Cart. Choosing ‘Create a Package' allows users to package and name their query information for download. Choosing ‘Associate to Study Cohort' gives users the opportunity to choose the Study Cohort they wish to associate this data. 