This project seeks to understand and reduce a common and potentially dangerous type of error, where a person fails to respond to something that is right in front of them. These “Look but fail to see” (LBFTS) errors can be something trivial, like a typo in an email, or something much more significant, like a pedestrian in the street. To qualify as an LBFTS error, the item that is missed must be clearly visible and the observer must be ‘expert’ enough to identify the item. Thus, for example, no one would be expected to find a typo in a letter that was written in a language they do not know. Collaborating researchers in the US and the UK will create object and scene databases using real-world stimuli for use in LBFTS experiments. The goal is to identify strategies that reduce these errors, so that they can be minimized in many arenas. Of particular interest are those arenas that impact national health and security, as when a radiologist fails to see signs of cancer in a lung x-ray or a screener fails to see a weapon in carry-on luggage at the airport. The creation of carefully curated object and scene databases will benefit many. Existing object databases are aging and often include objects that observers may not easily recognize (e.g., a dial-up modem). The experiments will identify objects that are correctly recognized by observers over 90% of the time. They will also quantify the memorability of each object and scene. Stimuli will be validated by replicating previous LBFT