Fundamental measurements with muons - View from PSI

Muons can serve as probes to precisely determine fundamental parameters of the Standard Model or search for 'new physics'. The high intensity muon beams at the Paul Scherrer Institut (PSI) allow for precision measurements and searches for rare or forbidden processes. Both types of experiments challenge the Standard Model in a way complementary to high energy physics. We give a short overview of recent results and ongoing experiments at PSI, and of ideas for the future.