Those data available in the book of RIVIERRE & al. are based on three major sources:
Maurice LEENHARDT's questionnaire reworked by André-Georges Haudricourt; this questionnaire has been used in the village of Oundjo (1959) and Népou (1963)
Jean-Claude RIVIERRE questionnaire used in Nepou (1994)
The results revision of the previous RIVIERRE's questionnaire by J-C. RIVERRE himself and Sabine EHRHART between 1995 and 1999 in the villages of Népou and Oundjo.
Methodology:
The book of RIVIERRE & al. Contains two dictionaries. The first one translates
the Bwatoo lexical items in french and provides more semantic features. Along
with the translation in french, this dictionary provide a translation for
Haeke and Haveke as well. The second one translates the french lexical items
in Bwatoo, and provides only a translation without providing any additional
information on the semantic features. The second dictionary has been used
first to find the targeted word in Bwatoo, and then, from the Bwatoo word, the
first dictionary has been used to find the translation in Haeke and Haveke.
When there is more than one term found in Bwatoo for one lexical entry in
french, the first dictionary and the developed semantic features it provides
has been used to reduce as much as possible the variation and to keep the more
relevant term
Several lexical items refer to the same notion. As the
dictionary mainly provides a description of the semantic features of bwatoo
words, it has not been possible to reduce the synonymy cases. As a consequence,
all the lexical item found for a listed entry has been included.