Symmetry tests within the Standard Model and beyond from nuclear muon capture

Precision measurements in nuclear muon capture on the proton and ³He allow for tests of the Standard Model for the strong and electroweak interactions, complementary to those achieved in high energy experiments. The present situation and future prospects are reviewed, emphasizing where renewed efforts could prove to be rewarding in exploring ever further beyond the confines of the Standard Model. This revised version was published online in August 2006 with corrections to the Cover Date.