We summarize results obtained in our studies of the pion-nucleon coupling constant. Several different techniques have been applied to πN and N N elastic-scattering data, and the existing database for single-pion photoproduction. The most reliable determination comes from πN elastic scattering. The sensitivity in this reaction was found to be greater, by at least a factor of 3, when compared with analyses of N N elastic scattering or single-pion photoproduction.PACS number: 13.75.Gx Typeset using REVT E X * e-mail: arndtra@said.phys.vt.edu 1 1. Introduction A number of groups have recently extracted the pion-nucleon coupling constant (g 2 /4π), mainly from analyses of πN and NN elastic scattering. In the πN case, results have been obtained via dispersion relations [1], through the fitted couplings of a tree-level model [2], and from the long-range part of a potential approach [3]. Values of g 2 /4π have been determined from the one-pion-exchange part of the NN interaction in fits [4,5] to either the "full" lowenergy database or restricted kinematic regions expected [6] to be more sensitive to this coupling.In order to determine which data are most sensitive to g 2 /4π, we map χ 2 versus g 2 /4π for a variety of energy-dependent partial-wave analyses. The parabolic "widths", near the resulting minima, are taken as a measure of the "uncertainty" in the determinations. In Section 2, we give results from our analysis of πN elastic scattering to T π =2.1 GeV. In Section 3, we discuss a number of global fits of NN elastic scattering data to T lab =400 MeV. In Section 4, we consider our current analysis of pion-photoproduction taken to E γ =500 MeV, as well as mappings extended to E γ =2 GeV. This reaction also shows a sensitivity to the value of g 2 /4π Finally, in Section 5, we give a summary of our conclusions.