Maintaining close communication with the neighbors is important as it helps the caregivers to monitor whether there is any deterioration in the cognitive ability of the elderly. Although some caregivers live with the elderly, they have to go to work during the day and in fact, they do not spend much time with each other every day. As a matter of fact, the most common people that the elderly receive every day are their neighbors, security guards, relatives and friends. Through daily contact, the people around the elderly are in the best position to monitor whether they are unable to cope with their daily needs due to deterioration in their cognitive ability, such as answering questions, going out with all the keys, pressing the buttons correctly on the lifts, searching for their own homes, and recognizing the way. If caregivers can maintain close communication with their neighbors and establish a tacit understanding in advance to contact them once they notice any abnormalities in the elderly, it will be of great help in recovering the lost elderly as soon as possible.