The phrase "a system from scratch" is correct and usable in written English.
It can be used when referring to the process of creating or building a system without using any pre-existing components or frameworks.
Example: "The team decided to develop a system from scratch to ensure it met all of their specific requirements."
Alternatives: "a system from the ground up" or "a system built from the beginning".
Setting up such a system from scratch in the United States wouldn't be easy.
They don't have to use them, but it's easier to piggyback on Facebook's prowess than build a system from scratch.
If one could design a system from scratch to defend against a resurgent Russia some day, it would presumably look quite different than the one in place now.
"If I was designing a system from scratch I wouldn't suggest creating grammar schools and I wouldn't support the expansion of grammars on the grounds of social mobility.
During the presidential campaign, he said, "If I were designing a system from scratch, I would probably go ahead with a single-payer system".
If the parties were to design a system from scratch, there is no way that we would end up with the current fifty-state patchwork of rules and types of contests.
While investigating a disaster, I was trying to create a resilient system from scratch on a very limited budget.
When developing a CBR system from scratch, an index for case base quality supports an assessment of the actual cases.
What connects us is the pride in our country, which just like a start-up built a democratic system from scratch and secured the economic freedoms with a system of independent courts.
Real-time disclosure wouldn't mean creating a new system from scratch so much as making an existing process public.
We should avoid the naïve goal of perfecting a political system from scratch on the basis of abstract concepts; instead, only a pragmatic, syncretic approach -- sampling from different systems for what works best -- will achieve a resilient, native design that will be endorsed by the citizens it will govern.
