1. Draw the time/space four-quadrant matrix model of Collaborative work. 2. List the varied situations for collaborative interfaces? Describe any one. 3. Describe how online communities are used for distance education 4. What is instant messaging? Give example. 5. List few videoconferencing platforms. 6. Describe Quality of Service. 7. Explain simple stages-of-action model of system response time and user think time. 8. List the user criteria to achieve rapid task performance, low error rates, and high satisfaction. 9. Describe the three primary factors that influence users' expectations and attitudes regarding response time. 10. Write the sources of User frustrations.