Organization responsible for the statistics
The statistics are collected by the labour inspectors, and
compiled and published by the Sección de Estudios y Estadística
of the Ministerio de Trabajo y Seguridad Social.
Objectives and users
Strikes and lockouts
The statistics cover:
Work stoppages initiated by employers and rotating or revolving
strikes are not included, nor are working to rule, go-slows or
- constitutional or official strikes
- unofficial strikes
- sympathetic strikes
- political or protest strikes
- general strikes
The public sector is not covered by the statistics; public
sector employees are forbidden to take strike action.
Workers directly involved and workers indirectly involved. In
addition to regular paid employees, the statistics cover
temporary and seasonal workers. Part-time workers, casual and
unpaid family workers are not included, nor are workers laid off
or workers absent on sick or annual leave or absent for any other
No particular occupational groups are excluded.
Types of data collected
- number of strikes
- number of economic units involved
- number of workers involved
- time not worked
- cost of hours not worked
- outcome of dispute
Concepts and definitions
A collective work stoppage with a view to enforcing demands of an
occupational or economic nature, having previously fulfilled
legal procedures (collective bargaining process).
Work stoppage (paro)
A collective work stoppage without warning, when the legal
procedures are not fulfilled, as in the case of workers in the
public service or of workers not submitting claims of an
occupational or an economic nature (illegal strikes).
Civic work stoppage (paro civico)
An interruption of economic activity as a means of exerting
pressure in order to find a solution to local problems.
These are working definitions used for statistical purposes.
Methods of measurement
Strikes and lockouts
The basic unit of measurement used to record a strike is the
economic unit (establishment or enterprise). A strike that is
interrupted but later resumes, still due to the same case of
dispute, is counted as a new strike when it resumes.
Economic units involved
The economic unit is the establishment, firm, enterprise or
The number of workers involved in a strike refers to the total
number of union members. The number of workers involved in a
work stoppage (paro) is the total number of workers
participating in that stoppage.
The duration is measured in workdays from the date the strike
began in the first economic unit involved to the date it
terminated in the last one.
Time not worked
Total time not worked is measured in workdays, either by
ascertaining the total amount time not worked on each day of the
strike and summing these totals, or as the product of the number
of workers involved and the duration. Overtime is not taken into
Branch of economic activity
The data are classified by branch of economic activity using an
international classification (00 to 09).
Reference period and periodicity
The statistics are compiled and published for periods of a month,
six months and a year. They refer to strikes beginning during
the particular reference period plus those continuing from the
Historical background of the series
Ministerio de Trabajo y Seguridad Social: Boletín de
Estadísticas del Sector Trabajo (bi-monthly).
Data published by the ILO
The number of strikes and lockouts, the
number of workers involved, by
Methods of data collection
There is no legal obligation to report the occurrence of a
strike. Information is obtained from reports by labour