time and was most watched that week, receiving 3.762 million viewers on CTV Total. In Australia, the episode aired on November 14, 2011 and received 1.359 million viewers, ranking it second most watched that night. In the UK, the episode aired on December 15, 2011 and had 1.176 million viewers on E4, ranking it second on the channel that week. On E4 +1, 0.330 million households watched the episode, ranking it third on the channel and giving the episode 1.506 million viewers overall. It ranked seventh on digital television overall. Reviews Oliver Sava of The A.V. Club gave the episode a B+, describing it as "one of the season's best". Sava noted that Amy had been "largely operating in the background for most of this season" but claimed she was "The Big Bang Theory'''s most valuable asset". Sava had previously suggested that an episode of the show should focus on "Amy's desire to be one of Bernadette's bridesmaids". Robin Pierson of The TV Critic rated the episode 58 out of 100, complimenting the "solid attempt to make Amy a more sympathetic character" but wanting the writers to "show Amy learning something from this experience". Pierson also said "the episode wasn't particularly funny" but that Bernadette and Penny's "tolerance of [Amy's] blunt eagerness reflects well on them" and that "Leonard too looked good for pushing Sheldon to take care of his friend". Jenna Busch of IGN gave the episode eight out of 10. Busch "really enjoy[ed] the dynamic between the girls". Carla Day of TV Fanatic'' gave the episode four out of five stars, but described Amy as "whiny and irritating". However, Day said the scene where Sheldon shouts at Howard and Leonard was "one of the funniest things I've ever seen on the show". Day noticed that "we found out that Leonard is single again", following the events of "The Good Guy Fluctuation". References External links "The Isolation Permutation" at CBS.com Chuck Lorre's vanity card 2011 American television episodes The Big Bang Theory episodes