1. INTRODUCTION
A lot of research has been focused on computer assisted pronunciation training (CAPT) in the recent years which supports in most cases learners of the second language (L2) English. Primarily, language specific, rule based approaches have been investigated; all rules depend on the learners’ mother tongue. For the European languages, an important research project was ISLE (described by Herron et al.[1]), that has focused on adult German and Italian learners. In the European project Pf-Star [2] we focused on speech technologies for children. Based on these technologies, different systems for the assessment of pronunciation have been developed in our institute, e.g to objectively evaluate speech disordered children with a cleft lip and palate. Caller is a system for computer assisted language learning from Erlangen [3], a client/server system that can be started in a browser; speech is analyzed on a server, e.g. placed in a school's computer room (Fig. 1).