Conducting a fair test is one of the most important ingredients of doing good, scientifically valuable experiments. To insure that your experiment is a fair test, you must change only one factor at a time while keeping all other conditions the same. Scientists call the changing factors in an experiment variables.
Eligibility Requirements for VFW Auxiliary Membership: Members must be citizens of the United States or a United States National, and at least 16 years old.
AWS ITI Sheet Metal ATF List. The AWS Accredited Test Facility (ATF) program requires that a facility implement a quality assurance program that meets the requirements established in the AWS QC4-89, Standard for the Accreditation of Testing Facilities.