Am using \vbox{\hsize8cm text} to typeset my document with blocks of text. This makes a left and right justification of the text, but most of the time it does work alright and i get a ragged right text.

What do i have to do in order to avoid this and get my text justified at both sides ?

perhaps \setuptolerance[tolerant] if not, you should be more precise in your description. Patrick -- ConTeXt wiki and more: http://contextgarden.net