Fighting evil is not enough when refactoring metamodels
Bibliographic record
Abstract
In model-driven engineering, metamodels are central artifacts that allow to capture domain concepts and build domain-specific languages. However, bad design decisions, continuous changes, and the evolution of requirements may introduce bad smells and deteriorate the quality of metamodels. Refactoring metamodels is a complex task as it should be performed according to many conflicting quality attributes while maximizing the removal of smells. In this paper, we propose a generic automated approach based on a multi-objective heuristic search to refactor metamodels. The process aims at generating a set of refactoring recommendations with various quality trade-offs from which the modeler can choose the most appropriate for her context. We evaluate the efficiency of our approach with a user-based experiment, on time to perform understandability and extendibility tasks, as well as the correctness of the task output. Our results show that, globally, considering trade-offs between quality and smell removal is significantly better than focusing on smell removal alone. The observed difference is statistically significant for the extendibility but only partially for the understandability.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.008 | 0.039 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".