### Q1: What is the primary programming language used in the Express.js framework?  
### Q2: How does Django's "batteries-included" philosophy enhance its functionality compared to other frameworks?  
### Q3: What performance considerations should be taken into account when using Ruby on Rails for larger applications?  
### Q4: Which framework would you recommend for a lightweight application, and what makes it a suitable choice?  
### Q5: In what scenarios would Django be preferable over Express.js for back-end development?  
### Q6: How can the choice of Ruby on Rails impact the development timeline for a startup project?  
### Q7: Why is it important to communicate the reasons behind choosing a specific back-end framework to your team?  
### Q8: How can effective communication skills aid in discussing the advantages of different frameworks with stakeholders?  
### Q9: What strategies can be employed to ensure clear communication when presenting the framework selection process to non-technical team members?