The README.rdoc (http://github.com/bret/watir/blob/master/README.rdoc) says: Actual text: > Setting and clearing a radio button > > browser.radio(:value => "watir").set > browser.radio(:value => "watir".clear Closing parenthesis is missing, should be > browser.radio(:value => "watir").clear Additionally the example page (http://bit.ly/watir-example) as given in the code/README actually is: ... <label class="ss-q-help" for="entry_2">Radio buttons</label> <ul class="ss-choices"><li class="ss-choice-item"><label class="ss-choice-label"><input type="radio" name="entry.2.group" value="Watir" class="ss-q-radio" id="group_2_1"> Watir</label></li> <li class="ss-choice-item"><label class="ss-choice-label"><input type="radio" name="entry.2.group" value="Selenium" class="ss-q-radio" id="group_2_2"> Selenium</label> ... This uses 'Watir' while the example code is 'watir' which in turn raises an exception: > ... > Watir::Exception::UnknownObjectException: Unable to locate element, using {:value=>"watir"}