Hi Wolfgang,
thank you for the answer (There is much to know !).

I would also have this:

I First chapter
   Activity
   1.1 Second section
   1.2 Third section

\setupheadnumber[section][0]

Fabrice

2016-07-13 18:20 GMT+02:00 Wolfgang Schuster <schuster.wolfgang@gmail.com>:
13. Juli 2016 um 17:09
Hello,
I wish that in the table of contents and only one, the number of chapters are I, II, III, IV ...

When you change a different conversion for the chapter numbers only in the ToC use this:

\defineconversionset[chapterconversion][n,R][n]

    \setuplist
        [chapter]
        [numberconversionset=chapterconversion]

but when you want it in the entire document use this:

\defineconversionset[chapterconversion][n,R][n]

    \setuphead
        [chapter]
        [sectionconversionset=chapterconversion]

Wolfgang

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