Contextual explanation: Communicating and maintaining personal or professional limits. 
Boundary setting is best understood as an action—specifically, the act of clearly communicating and upholding limits regarding what one will and will not accept or do in relationships, work, or daily interactions. It involves both the articulation of boundaries and the ongoing regulation of interactions to ensure those boundaries are respected.

Themes: Communication and self-protection. 
Boundary setting is central to the theme of effective communication, as it requires expressing one's needs and limits clearly to others. It is also closely linked to self-protection and personal agency, since setting boundaries helps individuals safeguard their well-being and maintain healthy relationships.

Nuance: Proactive limit-setting. 
What distinguishes boundary setting within its category is its proactive nature—the emphasis is on intentionally defining and communicating limits before issues arise, rather than reacting after boundaries have been crossed. This proactive approach supports clarity, reduces conflict, and fosters mutual respect in various contexts.