The attributes in the article are technical capabilities that should be used in order to fulfill the non-functional requirements, so the most important and common quality attributes are:

1. Scalability.
2. Manageability.
3. Modularity.
4. Extensibility.
5. Testability.

In reality there are much more quality attributes: wikipedia.

Scalability

Adding computing resources without any interruption.

Non-Scalable System, which obviously require a lot of efforts to fix it:

1. Look for non-scalable code.
2. Rewrite non-scalable code.
3. Reinforce VM.

Scalable System:

1. Add VM.
2. Notify the Load Balancer.

There are 2 types of scalability: scale up (vertical) and scale out (horizontal).

The preferable option is Scale Out which has 2 main benefits:

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