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Current smartphone operating systems employ permission systems to regulate how apps access sensitive resources. These systems are not well-aligned with users' privacy expectations: users often have no idea how often and under what circumstances their personal data is accessed. We conducted a 131-person field study to devise ways to systematically reduce this disconnect between expectations and reality. We found that a significant portion of participants make contextual privacy decisions: whendoi:10.5281/zenodo.3264735 fatcat:xnwdxobsknfsri6s3yvckjoviy