This document provides a primer on strikes, picketing, and lockouts under Philippine labor law. It defines these terms and discusses the different types of strikes. It outlines the requirements for legal strikes and lockouts, including filing notices, taking strike/lockout votes, and observing cooling-off periods. It also discusses the roles of the National Conciliation and Mediation Board and prohibits certain acts like declaring strikes for non-valid reasons, using violence during picketing, and hiring strikebreakers. Non-compliance with requirements can result in strikes being deemed illegal.