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More and more evapotranspiration models, evapotranspiration crop coefficients and associated measurements of evapotranspiration (ET) are reported in the literature. These measurements base from a range of measurement systems including lysimeters, eddy covariance, Bowen ratio, water balance (gravimetric, neutron meter, other soil water sensing), sap flow, scintillometry and even satellite-based remote sensing and direct modeling. All of these measurement techniques require substantial experimental care and can be prone to substantial biases in reported results. Reporting of data containing measurement biases causes substantial confusion and impedence in the advancement of ET models and in the establishment of irrigation water requirements, and can translate into millions of dollars of economic losses caused by misinformed water management.