• Data reference period
• Place of residence (Portugal)
• Sex
• Usage frequency of computer

• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.
• INFORMAL LEARNING:  Learning arising from everyday activities associated with work, family, social life or leisure. It normally takes place outside institutional structures in a learning environment that the learner (or someone else) can organise and structure freely. It does not result in certification. Although, skills acquired from this via can be submitted to a validation and certification process.
• RESIDENT POPULATION:  The persons who regardless of the fact that at the moment of observation ' 0:00 a.m. of the reference day ' are present or absent in a given housing unit, this unit being where they live during most of the year with their family, or where they have all or most of their belongings.

(Persons aged between 18 and 64 years old who participated in informal learning activities/ Resident population aged between 18 and 64 years old)*100