@article{Busch2009-BUSOTS,journal = {Foundations of Physics},volume = {39},pages = {712--730},title = {On the Sharpness and Bias of Quantum Effects},author = {Paul Busch},number = {7},year = {2009},abstract = {The question of quantifying the sharpness (or unsharpness) of a quantum mechanical effect is investigated. Apart from sharpness, another property, bias, is found to be relevant for the joint measurability or coexistence of two effects. Measures of bias will be defined and examples given}}@