Job Security – Assurance (or lack of it) that an employee has about the continuity of gainful employment for his or her work life. Job security usually arises from the terms of the contract of employment, collective bargaining agreement, or labor legislation that prevents arbitrary termination, layoffs, and lockouts. It may also be affected by general economic conditions.

Read more: http://www.businessdictionary.com/definition/job-security.html

Just Cause – The standard of just cause provides important protections against arbitrary or unfair termination and other forms of inappropriate workplace discipline. Just cause has become a common standard in labor arbitration, and is included in labor union contracts as a form of job security. Typically, an employer must prove just cause before an arbitrator in order to sustain an employee’s termination, suspension, or other discipline. Usually, the employer has the burden of proof in discharge cases or if the employee is in the wrong.

Read more on Just Cause here