Inability of an individual or a group to perform the given tasks up to the established standards. http://www.businessdictionary.com/definition/deficiency-performance.html.
TSA Requirements. The TSA requires that adult passengers ages 18 and older show valid photo ID at the security checkpoint. Children, however, are not required to present such identification. This does not mean, however, that children will be able to fly without it.
For most children age 12 or younger, there is no need to apply for TSA Precheck since they are included under their parents but they can apply. Once your child turns 13 years old, he or she would need to get their own TSA Precheck in order to use the TSA Precheck lanes with the rest of the family.