Specifications include, but are not limited to: Complete measurements within the time specified for the project. Enter all data in the error-checking spreadsheet provided by the Forest Productivity Cooperative Data Manager. Send the completed spreadsheet to the Forest Productivity Cooperative Data Manager by the date specified for the project. The error-checking spreadsheet contains instructions, previous measurements, damage codes, mortality codes, and minimum and maximum expected growth. When data is entered into the error-checking spread sheet, values that are less than or greater than the expected growth will be flagged by the cells turning yellow. Where a cell turns yellow, re-check the value in the field and correct as needed. If the tree has damage or disease that would explain the measurement, enter the damage or disease code in the damage column. If the tree does not have damage or disease that explains the flagged value, provide an explanation in the comments cell. Do not change the values for expected growth unless the change is approved by the Forest Productivity Cooperative Data Manager. Measure diameter at breast height (DBH; 4.5 feet) to the nearest 0.1 inches, total height to the nearest 0.1 foot, and record FPC damage and mortality codes for all measurement trees. See the Height To Live Crown Protocol (below) for details on measuring this variable. Take DBH measurements at exactly the same place each period; therefore, place the diameter tape above and touching the nail on each tree. For trees that are too small to be nailed (DBH< 3 inches) or have not been nailed, use a 4.5 ft pole as the reference point for DBH measurement. Collect height measurements including height to the live crown with a height pole for trees less than or equal to 15 feet in height. Measure height and height to the live crown with a laser hypsometer or similar device on trees taller than 15 feet. Calibrate the accuracy and precision of the hypsometer at the beginning of each day of measurement and during each day when a break of more than 30 minutes occurs in measuring. If a tree has a severe lean, wind throw or is otherwise not vertical but is still alive, then the appropriate height measurement is distance along the stem.