Why did you make synchronous interaction on the diagram?

Synchronous interaction on a diagram reflects a situation where the calling process waits for the called process to complete before continuing its work. This is important if subsequent actions depend on the result of the call.

Reasons for choosing synchronous interaction:

• The need to receive a response or result immediately to continue processing.
• Ensuring operation sequence and simplifying error control.
• Reflecting real business processes where steps are performed sequentially.

For example, if a payment system must wait for transaction confirmation before releasing goods, a synchronous call is justified.

If the interaction were asynchronous, the calling process could continue without waiting, which is not always acceptable for critical operations.