Use the 'Quality Assurance' tab of the Preferences window to determine which types of the quality assurances should be done on the current open thesaurus.
The available types of quality assurances are listed below:
Multiple concept numbers for each term
Multiple terms for each concept number
Multiple translations for each term
Multiple terms with the same translation
Same broader terms
Being a term as both preferred and non-preferred term
Related terms existing
Opposites existing
Duplicate term with the same parent
Multiple type of relations with a same term
Circular references
Each time you modify the thesaurus or terminate the quality assurance process, you should start it again from the scratch. Optionally, you can set the 'Start QA Report from the selected term' option to start it from the selected term toward the end of thesaurus. In this case, all the rest of terms above the selected term will be checked later.