The Trail Making Test (TMT) is a widely used neuropsychological test that assesses visual-conceptual and visual-motor tracking, as well as divided attention and shifting ability. This study provides normative values for TMT parts A and B, and the (B-A) difference, based on data from 287 Italian adults (ages 20-79), stratified by gender, education, and age. The test scores were influenced by age, education, and general intelligence (measured by Raven's Coloured Progressive Matrices). Only part A showed gender differences, with females taking longer than males. Test-retest reliability was high for all scores. The TMT consists of two parts: part A involves connecting numbered circles, while part B requires alternating between numbers and letters. Part B is more complex and time-consuming, reflecting cognitive activity and shifting ability. The (B-A) difference is considered a measure of cognitive function. While the number and type of errors are not sensitive in distinguishing brain-damaged patients from healthy individuals, TMT is sensitive to brain damage due to its reliance on psychomotor speed and divided attention. TMT performance generally declines with age, except in some cases. Intelligence and education levels also affect TMT results. Emotional disturbances and anxiety may influence part B, but less so than brain damage. Despite its widespread use, normative data for Italian adults are limited. This study provides normative data for 287 normal Italian adults, analyzing the influence of age, education, gender, and general intelligence. The study used Reitan's administration format, with part A involving connecting numbered circles and part B alternating between numbers and letters. Statistical methods included multiple regression to adjust scores for age, education, and gender. Adjusted scores were calculated, and tolerance limits were determined for the upper 5% of values. These findings provide valuable normative data for the TMT in Italian adults.The Trail Making Test (TMT) is a widely used neuropsychological test that assesses visual-conceptual and visual-motor tracking, as well as divided attention and shifting ability. This study provides normative values for TMT parts A and B, and the (B-A) difference, based on data from 287 Italian adults (ages 20-79), stratified by gender, education, and age. The test scores were influenced by age, education, and general intelligence (measured by Raven's Coloured Progressive Matrices). Only part A showed gender differences, with females taking longer than males. Test-retest reliability was high for all scores. The TMT consists of two parts: part A involves connecting numbered circles, while part B requires alternating between numbers and letters. Part B is more complex and time-consuming, reflecting cognitive activity and shifting ability. The (B-A) difference is considered a measure of cognitive function. While the number and type of errors are not sensitive in distinguishing brain-damaged patients from healthy individuals, TMT is sensitive to brain damage due to its reliance on psychomotor speed and divided attention. TMT performance generally declines with age, except in some cases. Intelligence and education levels also affect TMT results. Emotional disturbances and anxiety may influence part B, but less so than brain damage. Despite its widespread use, normative data for Italian adults are limited. This study provides normative data for 287 normal Italian adults, analyzing the influence of age, education, gender, and general intelligence. The study used Reitan's administration format, with part A involving connecting numbered circles and part B alternating between numbers and letters. Statistical methods included multiple regression to adjust scores for age, education, and gender. Adjusted scores were calculated, and tolerance limits were determined for the upper 5% of values. These findings provide valuable normative data for the TMT in Italian adults.