eHarmony's CEO needs to decide how to react to imitations of its business model, encroachment by competing models and ascendance of free substitutes. The case provides four options to address these threats and asks students to choose one after they analyzed the company's strategy. The analysis begins with understanding of value proposition, as derived from failures of substitutes. It proceeds to examine industry structure and important differences across its different niches. Students can then analyze the essence of a focused differentiation strategy and understand the importance of costly strategic trade-offs. They can also estimate the size of eHarmony's competitive advantage over two other competitors before articulating threats to sustainability, all of which will help them choose one of the four options.