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treemarks.ai

Rapid conceptual feedback.

Treemarks uses your course materials to highlight the gap between what a student submitted and what earns full credit. Students see what is missing so they can close the loop.

Feedback before the grade.

Students need feedback while they can still use it. When it arrives a week or more after the deadline, students may already have moved on. Returning feedback with a grade can weaken its benefit.

Your team can share Treemarks’ conceptual feedback without scores, then release grades after review. Students can focus on what to revisit before seeing the mark.

The evidence and our study-plan hypothesis →

Name the missing concept.

Show what is missing and how to address it.

P4 · Present-worth comparison
8 / 10
Rubric
Places the initial cost, annual savings, and terminal salvage with the correct sign and timing 4 / 4
Discounts the annual savings to the present, but adds the year-8 salvage value without discounting it 4 / 6
  1. The $12,000 arrives in year 8. Bring it to year 0 using 12,000 ÷ 1.08⁸ before adding it to the other present values.
  • Course reference: time value of money — single future payment.
Your work
+3,200/yr +12k −28k 0 8
PW = −28,000 + 3,200(P/A, 8%, 8) + 12,000
PW ≈ $2,389
Synthetic example, shown with its score.

See the concept behind the class average.

A total score can hide a shared difficulty. See which concepts need attention, then decide what to revisit with the class or explore in office hours.

ENGR 120 · Engineering Economy - Summer 2026 Exam 1 · Grading summary

Submissions

15 / 17

Mean

94.5 / 100

Median

97 / 100

What needs attention

2 students did not submit.

3 of 15 did not fully explain the learning percentage.

Strength by concept

Learning curve

Q5-Q6 · 20 pts

87%

Decision framing

Q7 · 10 pts

89%

Time value of money

Q2 · 20 pts

93%

Equivalent-life comparison

Q3 · 20 pts

99%

Benefit-cost and externalities

Q4 · 30 pts

99%
De-identified example based on a real pilot, N=15 submissions.

Start with one assignment.

Bring your course materials and a staff reviewer. See the feedback on work you know.

Try us out
Is AI assessment accurate? →

See what we have tested, what the results mean, and what still needs to be checked.