Research question embedded in a highly specific, well-motivated context linking amusement-park observations to pendulum Doppler measurements.

Detailed apparatus list and procedure including controlled-variable table and justification of measurement intervals.

Clear discussion of error sources (e.g. using first oscillation to minimise damping, sound-proof room) demonstrating strong methodological awareness.

Minor omissions in operational detail (e.g. exact microphone placement, ambient conditions).

Uncertainty estimates missing for string length and stand height.

Intermediate steps in theoretical derivations are elided, reducing full reproducibility.

Data recorded and processed in clearly labelled tables with uncertainties; graphs include error bars, best-fit lines and R² values.

Sample calculations are shown step-by-step with appropriate significant figures.

Processing choices (e.g. √(1–cosθ) fit) demonstrate thoughtful analysis.

Significant omissions in uncertainty propagation (string length, theoretical curve).

Inconsistencies in stated instrument uncertainty and omitted outlier criteria.

Duplicate table numbering and some manual rather than software-based uncertainty analysis.

Conclusion accurately restates observed trends and links to energy conversion and Doppler theory.

Includes a relevant comparison to published work (Nuryantini et al.).

Does not quantify the non-zero intercept or systematically assess agreement with theory.

Literature comparison remains qualitative without numerical benchmarking.

Misses deeper contextualisation in broader scientific or small-angle approximation frameworks.

Identifies multiple specific methodological weaknesses with associated impacts.

Proposes realistic, pragmatic improvements tied to each weakness.

Improvements are not prioritised or explained in terms of expected error reduction.

No feasibility assessment or quantitative justification of how suggested changes would improve results.

Lacks discussion of trade-offs or relative gain from each improvement.