  We discuss two precision experiments which will measure fundamental weak
interaction parameters: MuLAN's goal is the measurement of the positive muon
lifetime to 1 ppm, which will in turn determine the Fermi coupling constant G_F
to 0.5 ppm precision. MuCAP is the first experiment which will unambiguously
determine the induced pseudoscalar form factor of the proton, g_p. While
contradictory experimental results for g_p are under discussion, firm
theoretical calculations on the percent level within the framework of Chiral
Perturbation Theory are now challenging the measurements. We will describe our
experimental efforts and latest achievements.
