both the supplier and the employment agency to local authorities, the company said in its latest annual report on the conditions in its supply chain.
Apple has audited both small and ancillary suppliers, as well as large ones such as Korea's Samsung Electronics Co, for working conditions. It found 95 percent of sites audited complied with avoiding underage labor.
Child labor is an issue that is part of the larger supply industry as the component maker that Apple found violated child labor laws supplied parts to more than a hundred different companies, including automotive companies, Williams said, vowing to eradicate under aged labor from the industry.
"I don't know how long it will take to get there but that's our goal," said Williams, who has spent a significant amount of his 14 years at Apple in Asia managing the supply chain.
FOCUS ON STUDENT INTERNS
For 2013, Williams said a key focus for Apple will be student interns and ensuring that suppliers do not abuse the internship system, especially in China where many colleges require students to complete internships as part of their curriculum.
Some companies in China are solving labor shortages by employing students. Last September, city officials of the northeastern Chinese coastal city of Yantai ordered vocational high schools to send students to a large plant run by Foxconn - a key contract manufacture for Apple and other large electronics companies like Hewlett Packard - to overcome a shortage of workers.
Another focus areas has been "bonded labor", where agencies who help immigrant workers find jobs take a substantial portion of the worker's pay.
Apple said in the report that it asked suppliers to reimburse $6.4 million in excess foreign contract worker fees in 2012, according to the report.
The company said it achieved 92 percent compliance with a maximum 60-hour work week in its supply chain. Where violations were discovered, Apple took action, it said in its report.
Apple also found and stopped discriminatory practices against women workers in 34 supplier facilities that required pregnancy testing and 25 facilities that tested employees for certain medical conditions, the report said.