Evaluating a Rubric for Assessing Constraint-Based Solid Models

Abstract

A study was conducted during the Fall 2013 semester to examine the effectiveness of a rubric for evaluating constraint-based solid models. The rubric was created after studying conceptual frameworks and other research related to evaluating constraint-based CAD models. Since only one researcher evaluated the models in the 2013 study, it was recommended that a study be conducted where multiple experts evaluated the same models using this original rubric.During the Fall 2015 semester, three faculty experts in constraint-based modeling used the same rubric to evaluate a representative sample of models created by students in an introductory engineering graphics course. This paper presents literature related to evaluating constraint-based solid models and inter-rater reliability, describes the methodology and results of the study, and provides recommendations for further research related to evaluating constraint-based solid models.

A constraint redundancy elimination strategy to improve design reuse in parametric modeling

“…However, the success ratio decreases in examples 3 and 6 of the group of original profiles. These results corroborate other studies that show that under-and over-defined profiles are sources of potential errors [13][14][15]. The main causes of failure were unconstrained vertices (Fig.…”

“…The use of fully defined profiles is generally considered a best practice in parametric modeling, as under-and over-defined profiles are unstable, unpredictable, and a source of potential errors [13][14][15]. Most MCAD systems provide mechanisms to check for under-or over-constrained profiles during the modeling process [16].…”

Conceptual Cylinder Head CAD Project for Assessment

“…The rubric for the cylinder head CAD design project changed significantly during its use and was less detailed than rubrics used for fundamental 3D modeling courses [9]. When used for a course focused on internal combustion engine design and operation, students were expected to model the cylinder head geometry.…”