Daily Duties. A typical IT department has got operative (day-to-day), tactical (mid-term) and strategic (long-term) duties. Principal characteristics of IT architecture combine infrastructure, management and interfaces to the business. Infrastructure consists of hardware (switches, router, cabling, server, etc), software and offered services, such as consulting, outsourcing or a hybrid model. Development follows the steps of conception, realization and introduction (installation, launch). It includes business process modeling, design, requirement engineering, change management, build and test. System Integration goes back to the connection between people, task (resp. process) and technology.