They should carefully follow all standardized administration and scoring procedures as outlined in the test manual. Test manuals will indicate the test materials that are needed, the order of presentation, and the instructions that must be read verbatim. They will also indicate whether there are time limits, and, if so, what those time limits are. Any special instructions noted by the test manual should be observed. This includes meeting the requirements for specific equipment or facilities.
Alterations can invalidate results.
There are various extraneous influences that may affect the reliability and validity of an assessment procedure. To maintain the integrity of results you and your staff should make sure that adverse conditions are minimized. Choose a suitable testing location . Make sure the room is free of noise, traffic, and other interruptions. Chairs should be comfortable and tables should be at an appropriate height, with sufficient room for test booklets and answer sheets.