System design includes usually three main parts: architectural, logical and physical design. We give a short description what do we deliver among those steps.

Architectureal Design

Outcome:

  • System structure – system interrelated components. A key structural issue is minimizing dependencies between these components. This makes it possible to change one component without requiring changes in others.
  • System behaviour – Somplete behaviour and life-cycle of the actions. From simple (and measurable) items like timings (latency, response etc) to more complex system behaviour such as auditing, logging, replication etc.

Logical Design

Outcome:

  • An abstract representation of the data flows, inputs and outputs of the system.
  • Includes entity-relationship model diagram

Physical Design

Outcome:

  • The actual input and output processes of the system. This is explained in terms of how data is input into a system, verified, processed, and displayed.
  • In physical design, the following requirements about the system are decided:
    • Input requirements
    • Output requirements
    • Storage requirements
    • Processing requirements
    • System control and backup or recovery