The document outlines various methods for investigating non-profits, including reviewing basic records like Form 990s, annual reports, budgets, and board meeting minutes; examining financial information like revenues, expenditures, salaries, and administrative costs; investigating any lawsuits or controversies; directly contacting the non-profit through visiting their office, attending events, or speaking with board members; comparing the non-profit to similar organizations; and checking their oversight and audits with government regulators and watchdog groups.