Prompts with no single correct answer make some teachers uneasy, since traditional grading assumes a right answer to measure against. Stockton's "The Lady, or the Tiger?" is the classic case, as the author deliberately refuses to say what is behind the door. Yet these prompts are valuable precisely because they require students to reason rather than recall.

The solution is to shift what you are measuring. Instead of grading the conclusion, grade the quality of the path to it, including the clarity of the claim, the strength of the evidence, and the logic connecting them. Students quickly learn that an unusual answer supported by strong reasoning outperforms a popular answer with weak support.

This shift also changes how you communicate with students. Explaining at the start that any defensible reading can earn full credit encourages intellectual risk-taking. Without this assurance, many students try to guess what the teacher wants, which produces safe and uninteresting writing.

Define what counts as defensible

Not every answer is defensible, and your rubric should make this clear. A claim is defensible when it is consistent with the text and supported by accurate details. A student who argues that the princess chooses the lady because she is a kind person, ignoring all textual evidence of her jealousy, would be overlooking key information and would be graded accordingly.

• The claim does not contradict established facts in the text.
• The evidence is accurate and drawn from the story.
• The reasoning explains how the evidence supports the claim.
• The student acknowledges at least one plausible alternative reading.
• The conclusion follows logically from the argument presented.

Guard against your own bias

Teachers have opinions about ambiguous texts, and those opinions can seep into grading. If you personally believe the princess chose the tiger, you may unconsciously score tiger essays more generously. One safeguard is to score the argument first, then check whether your scoring has favored one position over the other across the class set.

A second safeguard is to share your scoring approach with a colleague or have them score a sample. Comparing results can reveal hidden preferences. Many teachers find that this simple check raises awareness and improves fairness over time.

Give feedback that engages with the idea

Feedback on open-ended essays is most valuable when it engages with the student's idea rather than evaluating the position. Asking a question like "How would your reading account for the princess's hesitation before she points?" pushes students to test their own interpretation. This kind of challenge helps them develop analytical depth.

It also models intellectual humility. By treating the student's idea seriously, even when you disagree, you demonstrate that interpretation is a conversation rather than a competition. Students tend to respond with more thoughtful revisions when they feel their reasoning is respected.

Support consistent scoring at volume

Scoring reasoning is more cognitively demanding than checking answers, and fatigue can affect consistency. Clear descriptors and sample essays help maintain steady standards throughout a large set. Revisiting anchor papers regularly keeps your sense of the score levels sharp.

AI grading tools can apply rubric criteria evenly to every essay, which is especially useful when the prompt has no right answer. Because the tool evaluates the argument's structure rather than the verdict, it can serve as a neutral first reader. Teachers then add the final layer of judgment, ensuring that nuance and originality are fully recognized.