Children's use of information is an issue in ethics and child development. Information is learned from many different sources and source monitoring (see also source-monitoring error) is important in understanding how people use information and decide which information is credible. Consider the example of a parent whose child has been diagnosed with hyperactivity; the parent searches the internet for information, reads books, participates in an online chat room with other parents in the same situation, and consults various medical professionals. Some of these sources will be credible (contain reliable information), and others will not. To be well-informed, the parent must filter information according to the reliability of the source.