Given the group job classification and collective agreement identification code, we extracted from the national bargaining archive the skill level definition and we created a skill grades classification for the workers. We added this information to Workers History Italian Panel -Whip-, and we created a new variable which allow us to identify whether a worker is skilled or unskilled. The new skill level variable increase the possibility for a better comprehension of labour market issues as well as for new studies_x000d_ in the field of job risk evaluation. The sections are organized as follow:_x000d_ 1. creation of skill level classification from national collective agreements archive;_x000d_ 2. short explanation of Whip archives;_x000d_ 3. adding informations to Whip archives;_x000d_ 4. checking the consistency and coverage of the skill level variable in Whip;_x000d_ 5. a first interpretation of the resulting skill distribution.