There are multiple definitions:

1. classical test theory(English)

   • the foundational theory of measurement of mental abilities. Its core describes the relationship between observed composite scores on a test and a presumed but unobserved “true” score for an examinee. Called “classical” because it is thought to be the first operational use of mathematics to characterize this relationship
   • IRT, NSKQ
   • Psychology, Mental health
   • https://doi.org…94-6209-404-8_2
   • https://doi.org…2970-017-0182-y

2. compensatory tracking task(English)

   • cognitive dysfunction due to schizophrenia is strongly associated with patients' social rehabilitation
   • BACS
   • Psychiatry, Cognitive function, Social aspects
   • https://doi.org…yon.2021.e06719

3. corneal touch threshold(English)

   • is species dependent
   • PFL
   • Ophthalmology, Veterinary medicine, Anesthesiology/analgesia
   • https://doi.org…ajvr.69.12.1655
   • https://doi.org…24.2012.01069.x

4. colonic transit time(English)

   • CC, IBS, LBT
   • Gastroenterology
   • https://doi.org….1111/nmo.12568