Some linguists are skeptical of this reconstruction methodology of Dacian. The phonetic systems of Dacian and Thracian and their evolution are not reconstructed directly from indigenous elements but from their approximative Greek or Latin transcripts. Greek and Latin had no dedicated graphic signs for phonemes such as č, ġ, ž, š and others. Thus, if a Thracian or Dacian word contained such a phoneme, a Greek or Latin transcript would not represent it accurately.The etymologies that are adduced to back up the proposed Dacian and Thracian vowel and consonant changes, used for word reconstruction with the comparative method, are open to divergent interpretations because the material is related to place names, with the exception of Dacian plant names and the limited number of glosses. Because of this, there are divergent and even contradictory assumptions for the phonological structure and development of the Dacian and Thracian languages. It is doubtful that the Dacian phonological system has been accurately reproduced by Greek or Latin transcripts of indigenous lexica.