TABLE 3.

Tasks and estimated time associated with each task needed to carry out the photo collection for the impact evaluation of the Chilean Law of Food Labeling and Advertising

Task	Responsible	Estimated time
Design of data collection agendas for fieldworkers according to priorities	Fieldwork coordinator	15 min for each day of fieldwork
Data (photo) collection in supermarkets or other food store settings	Fieldworkers	Every Tuesday, Wednesday, and Thursday for as long is agreed on with establishments
Daily meeting and discussion about data collection	Fieldwork coordinator and fieldworkers	1 h after each day of data collection
Daily backup (and removal of photos) from memory cards to external hard drive(s)	Fieldworkers	0.5 h after each day of data collection
Daily review of all photos collected	Fieldwork coordinator, possibly with experienced research assistants	∼3 h after each day of data collection
Re-collection of data (photos) that were identified as having errors or as missing when it was not possible to re-collect these data during the following day	Fieldworkers	∼1 h/mo of data collection (if possible)