> For the complete documentation index, see [llms.txt](https://infosys.selmotech.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://infosys.selmotech.com/selmo-solution/selmo-solution-en/selmo-how-it-works/selmo-training/chapter-4-the-ptf-principle-process-technology-function/4.7-ptf-as-a-methodology-for-standardization.md).

# 4.7 PTF as a methodology for standardization

PTF leads to machines being constructed according to the same thinking pattern:

* First it is analyzed (What does the function do?),
* then defined (Which signals are necessary?),
* then modeled (Which zones are used?).

This creates a standardization that is based on thinking rather than software libraries.

Selmo does not force the user to use a specific technique – it only requires that every function be formalizable.\
If it is not formalizable, the problem is not in Selmo but in the specification.


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