This paper presents Veval, an Internet based assessment tool under  development.
It  is  designed for  integration  into Velo,  a  virtual electronic  laboratory
system. Veval helps to utilize the manifold possibilities of self assessment and
examination via Internet. It provides a test generating module for the tutor and
an  examination  or  self  assessment environment  for  students  as  well as  a
component  responsible  for statistical  evaluations.  Based on  an  analysis of
several existing assessment tools, the requirements for Veval are discussed.  An
overview  of  the  flexible  and  portable  system  architecture  and  a   short
presentation of the graphical user interface are provided.

Keywords: web based examination, self assessment, test generation, test evaluation