Why do you Think Act II Scene 4 is Important in Educating Rita, and What Makes it Dramatically Effective?

Act II scene 4, is perhaps the defining scene, representing the crisis in the relationship between Frank and Rita. It is clear that Frank despises what Rita has become, whilst Rita conveys a strong desire to put her previous existence firmly in the past. In my opinion, this scene is very effective in demonstrating this crucial moment.
Simply from the very first few lines of speech and stage direction, from Rita’s explanation of her late arrival, Rita plainly expresses to Frank, that he is no longer her soul engagement, and explains how ‘we were talking about Shakespeare’. This reflects Rita’s extreme transformation from a timid character, lacking in confidence and highlights her previous reluctance to discuss literature with the ‘real students’ for fear of social and educational inferiority. Frank, much to Rita’s annoyance, replies with his familiar cynicism and sarcasm. This is greeted by Rita’s lack of concern, and efforts to leave, provoking Frank’s desp...