At first glance, some might find it odd that a qualitative researcher like me would be commenting on a section about data aggregation. However, data aggregation as it is called here, or elsewhere called “mapping” the Third Sector has emerged as an important component to my research. As a practice, mapping can georeference information (a literal map). As a metaphor, mapping can signal the gathering and collating of standardized information about the third sector. As an outcome, mapping can facilitate sampling frames and encourage comparative research. . This commentary considers the section of ‘data aggregation’ in this volume.