What is the order of testing levels when arranged from the most general to the more specialized?

The order of testing levels from the most general to more specialized is usually as follows:

1. Unit Testing — testing individual functions or methods.
2. Integration Testing — testing the interaction between modules.
3. System Testing — testing the entire system as a whole.
4. Acceptance Testing — verifying the system's compliance with the customer's requirements.

This order reflects the gradual narrowing of the testing scope from individual components to the complete system and its compliance with expectations.