You believed this is about Agile
If any of these is missing, it is NOT a project, but ongoing work
On the other hand, ongoing work can be executed more effectively as mini-projects
"At constant quality (are of the triangle), increasing one element affect the other two".
Example: client request more features, so you need more time or more resources
This is partially false! Time and cost are not unrelated variables in this equation
If you say that you don't do that, you are lying
usually we allocated buffers for unexpected delays in each task, but this buffer is always wasted.
Projects are not resilient to unexpected problems.
That is, while there is value in the items on
the right, we value the items on the left more.
The original Agile Manifesto