What are the sources of pressure that change and influence the development of gaap?

GAAP (generally accepted accounting principles) is a group of commonly observed accounting rules and standards used for financial reporting. GAAP is designed to make sure that financial reporting is clear, and accurate from one organization to another.  

The sources of pressure that change and influence the development of GAAP are numerous, and they include academicians, governmental agencies, private companies, practicing accountants, professional accounting bodies, and public opinion.

what is the statement?