Hi Jeroen,

it might make sense to use

\setuphead[chapter][
  conversion=R,
]
\setuplabeltext[nl][chapter={Boek }]

instead of ownnumber.

I would use one command for number and title and put both in the same kind of frame. Probably you should use a \strut in the text or \inframed[strut=yes] to assure the same text height.

HTH, Hraban

I have some style adjustments for the chapters. The chapter "numbers" need to be Boek I, Boek II, etc. A vertical separator was introduced with an inframe. The chapter title at the right side does not vertically align properly with the chapter number in the frame (inside the frame is vertically centered, the title not). Is there a way to align the chapter title with the chapter number?

\starttexdefinition MyNumberChapterCommand #1
    \inframed[frame=off,rightframe=on,framecolor=black,
     rulethickness=1px,height=30pt]{#1\enspace}
\stoptexdefinition

\setuphead[chapter][style={\bfc},numbercommand=\MyNumberChapterCommand,
    page=no]

\starttext

\startchapter
  [title={Algemene Beginselen},
   ownnumber={Boek I}]

\samplefile{tufte}

\stopchapter

\startchapter
  [title={Organisatorische Structuren},
   ownnumber={Boek II}]

\samplefile{tufte}

\stopchapter

\stoptext

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