4.1 PSYCHOLOGICAL BARRIERS BETWEEN THE CUSTOMERS AND THE CLOUD, AND THE WAYS TO OVERCOME THEM4.2 USER INTERFACE FOR CLOUD COMPUTING, ITS CONVENIENCE, USABILITY, AND FUNCTIONALITY FOR TRUSTWORTHY CLOUD COMPUTING4.3 THREATS AND ATTACKS TO CLOUDS4.4 TRUSTWORTHY CLOUD COMPUTING FROM HARDWARE SIDE: DATACENTER ARCHITECTURE, SERVERS, CLUSTERS, HYPERVISORS4.5 TRUSTWORTHY CLOUD COMPUTING FROM OPERATING SYSTEM SIDE: DESIRABLE OS FEATURES TO IMPLEMENT CLOUDS AND DATACENTERS4.6 USING ASPECT-ORIENTED PROGRAMMING FOR REFACTORING CLOUD SERVICES AND MAKING THEM TRUSTWORTHY: THE CONTRIBUTION OF ST. PETERSBURG UNIVERSITYEXERCISES TO CHAPTER 4