Limited Characters: One-act plays often have a smaller cast of characters and a more limited setting. "Riders to the Sea" features a small cast, including Maurya, the main character and mother, along with her daughters Cathleen and Nora. There is also a Chorus of Women and the character of Bartley, Maurya's son.

Unity of Time and Place: Many one-act plays maintain unity of time and place, meaning the events occur in a single location and within a short time frame. In "Riders to the Sea," the action occurs in and around the family's cottage, and the events unfold briefly.

Focused Theme or Conflict: One-act plays often revolve around a central theme or conflict, and "Riders to the Sea" is no exception. The play explores the theme of the sea as a relentless and tragic force. The sea impacts the characters' lives and highlights the harsh realities of island life.

To wrap up, "Riders to the Sea" is an ideal one-act tragedy, providing a concise and impactful theatrical experience.