Jacques Koreman, Olaf Husby and Preben Wik are responsible for the structure and design of L1-L2map, together with Øyvind Bech who has implemented the system. L1-L2map is used by the CALST system to carry out a contrastive analysis of source and target languages, and is the basis for the selection of exercises.

L1-L2map is based on the UCLA phonetic segment inventory database UCLA (UPSID), which was developed by Ian Maddieson and is available for free.

We are also grateful to Henning Reetz at the Institute of Phonetics of Frankfurt University for making his UPSID interface available to us.