COMPUTER SOFTWARE PLATFORM FOR ENABLING AUTHENTICATION AND AUTHORIZATION OF COMPUTER USES AND APPLICATIONS AND FOR PROVISIONING AND USER MANAGEMENT FUNCTIONALITY BY USING A VISUAL MODELING APPROACH, NAMELY, VISUALLY MODELING IDENTITY MANAGEMENT ARCHITECTURES, DEPLOYING IDENTITY MANAGEMENT ARCHITECTURE MODELS, RUNNING IDENTITY MANAGEMENT MODELS FOR PROVIDING AUTHENTICATION, AUTHORIZATION AND PROVISIONING SERVICES TO COMPUTER USERS AND APPLICATIONS