1. time planning: allocate time to each stranger reasonably and ensure that everyone only takes up appropriate time.

2. Organization strategy: In the signature task, people can be organized in a centralized area, such as a square or an event site. This is convenient to provide people with the opportunity to sign in turn and save moving time.

3. Effective communication: When communicating with every stranger, briefly explain your personal purpose and ask you to sign in the designated space. Clearly state the cooperation and help needed.