1. Determine if you are required to file a tax return. You are required to file a federal income tax return if you are a citizen or resident of the United States or a resident of Puerto Rico. Your marital status, age, filing method, and income all affect whether or not you are required to file taxes.
proficiency testing. proficiency testing. a program in which specimens of quality control material are periodically sent to members of a group of laboratories for analysis, with each laboratory's results compared with those of its peers. See also: proficiency samples.
software developer's kit (SDK) A software developer's kit (SDK) is a set of programs used by a computer programmer to write application programs. Typically, an SDK includes a visual screen builder, an editor, a compiler, a linker, and sometimes other facilities. The term is used by Microsoft, Sun Microsystems, and a number of other companies.