Build upon

[JPablo]

Originally Posted by chileno

Por siaca, lo decía por el humor más que nada.

Ah, claro, ¡tá entendío!

[brute]

[QUOTE=JPablo;87380]Talking about a curriculum, or a series of courses,
"they build one upon the next, in a gradient scale."
How would you translate this into Spanish?

I suspect that this has not been written by a native English speaker.

If it helps you, I would probably rewrite this in English along the lines of:

they build upon each other in a logical progression

This could be a better starting point for you

[JPablo]

Thank you, Brute. That helps. I believe the original idea is as you re-write it.
Or,
...they build upon each other in gradual progression of difficulty/complexity.