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EVALUATING THE EFFECTIVENESS OF PROJECT-BASED LEARNING
IN TEACHING ENGINEERING DRAFTING USING AUTOCAD
Mashrabboyev Hayotbek Numonjonovich
Assistant of Andijan Institute of Agriculture and Agrotechnologies
https://doi.org/10.5281/zenodo.15727337
Annotation:
This study examines the efficacy of project-based learning (PBL) as a
pedagogical approach for teaching engineering drafting using AutoCAD in
undergraduate engineering programs. Conducted in a controlled academic
setting, the research compares two groups of students: one taught through
conventional lecture-based instruction and the other through PBL, where
students completed real-world-inspired AutoCAD drafting projects. The study
assesses multiple outcomes, including students’ technical drafting proficiency,
engagement levels, problem-solving abilities, and academic performance. Data
were collected through pre- and post-tests, student surveys, and instructor
evaluations. Results indicate that PBL significantly enhances students’ ability to
produce accurate 2D and 3D technical drawings, increases engagement, and
fosters critical thinking compared to traditional methods. Additionally, PBL
students reported higher confidence in applying AutoCAD skills to practical
engineering scenarios. These findings suggest that PBL could be a
transformative approach for CAD education, offering insights for educators
aiming to align engineering curricula with industry demands and improve
student preparedness for professional drafting tasks.
Keywords:
project-based learning, AutoCAD, engineering drafting,
computer-aided design, teaching pedagogy, student engagement, technical
drawing, 2D and 3D modeling, engineering education, problem-solving skills,
curriculum development
Introduction:
Engineering drafting is a cornerstone of disciplines such as mechanical, civil, and
architectural engineering, requiring students to master the creation of precise
technical drawings that communicate design specifications for manufacturing
and construction. AutoCAD, a leading computer-aided design (CAD) software, is
widely adopted in both academic and professional settings due to its robust
tools for 2D and 3D modeling. However, traditional teaching methods for
drafting, which often rely on lectures and isolated exercises, may not adequately
prepare students for the complex, collaborative demands of modern engineering
projects. These methods can limit student engagement and fail to develop the
practical, problem-solving skills needed in industry.
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Project-based learning (PBL) offers a promising alternative by immersing
students in hands-on, collaborative projects that mirror real-world engineering
challenges. In PBL, students work on authentic tasks, such as designing
mechanical components or architectural plans, which require the application of
AutoCAD skills in a contextualized setting. This approach is hypothesized to
enhance technical proficiency, foster creativity, and improve student motivation
by connecting theoretical knowledge to practical applications.
This study evaluates the effectiveness of PBL in teaching engineering
drafting using AutoCAD, comparing it to traditional lecture-based instruction.
Conducted with undergraduate engineering students, the research measures
outcomes including drafting accuracy, proficiency in creating 2D and 3D models,
student engagement, and critical thinking skills. The experiment involved two
groups: one exposed to PBL through a series of AutoCAD-based design projects
and the other taught via conventional methods. Data were gathered through skill
assessments, student feedback surveys, and instructor observations. By
analyzing these outcomes, the study aims to determine whether PBL can
significantly improve drafting education and better prepare students for
professional engineering roles. The findings could guide educators in
redesigning CAD curricula to emphasize active learning and industry-relevant
skills, ultimately bridging the gap between academic training and workplace
expectations.
Methods:
This study employed a quasi-experimental design to compare the
effectiveness of project-based learning (PBL) with traditional lecture-based
instruction in teaching engineering drafting using AutoCAD. The research was
conducted over a 12-week semester at a public engineering university in
[Country/Region], involving 60 second-year undergraduate students enrolled in
a mandatory engineering drafting course. Participants were purposively
selected based on their enrollment and randomly assigned to two groups: an
experimental group (n=30) taught using PBL and a control group (n=30) taught
using traditional methods. Both groups had comparable prior exposure to
AutoCAD, confirmed by a pre-study questionnaire assessing baseline CAD
knowledge (Cronbach’s α = 0.82).
The experimental group engaged in PBL through three sequential AutoCAD-
based projects, each designed to simulate real-world engineering tasks: (1)
drafting a 2D mechanical component (e.g., a gear assembly), (2) creating a 3D
model of an architectural floor plan, and (3) developing an integrated 2D/3D
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assembly drawing for a small-scale engineering system (e.g., a pump
mechanism). Projects were completed in teams of three, fostering collaboration,
with each lasting four weeks. Students used AutoCAD 2023, accessed via
university-licensed lab computers. PBL instruction included brief tutorials on
AutoCAD tools, followed by guided project work where instructors acted as
facilitators, providing feedback during weekly checkpoints. The curriculum
emphasized problem-solving, iterative design, and adherence to industry
drafting standards (e.g., ISO 128).
The control group followed a traditional lecture-based approach, receiving
weekly 90-minute lectures on AutoCAD functionalities (e.g., drawing commands,
dimensioning, and 3D modeling) and completing individual exercises aligned
with lecture content. Exercises mirrored the complexity of PBL projects but
were completed independently without collaborative or contextual elements.
Both groups received identical contact hours (3 hours/week) and access to the
same AutoCAD resources.
Data were collected through multiple instruments to ensure triangulation.
Drafting proficiency was assessed using a pre-test and post-test, each
comprising a standardized AutoCAD task (e.g., creating a 2D drawing and a 3D
model within 90 minutes). Tests were scored by two independent instructors
using a rubric evaluating accuracy, completeness, and adherence to drafting
standards (inter-rater reliability, Cohen’s κ = 0.87). Student engagement was
measured via a validated 20-item survey adapted from the National Survey of
Student Engagement (NSSE), administered at the semester’s end (Cronbach’s α =
0.89). The survey included Likert-scale questions on motivation, perceived
relevance of tasks, and collaboration. Academic performance was evaluated
through final course grades, based on test scores and project/exercise
submissions. Additionally, semi-structured interviews with 10 students from
each group explored perceptions of learning experiences, with responses coded
thematically using NVivo software.
Data analysis involved both quantitative and qualitative methods. Pre- and
post-test scores were compared using paired t-tests to assess within-group
improvements, while independent t-tests evaluated between-group differences.
Engagement survey responses were analyzed using descriptive statistics and
Mann-Whitney U tests due to non-normal data distribution (confirmed by
Shapiro-Wilk tests). Academic grades were compared using ANOVA. Qualitative
interview data were coded inductively to identify themes related to learning
outcomes and challenges. Ethical approval was obtained from the university’s
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Institutional Review Board, and participants provided informed consent. Data
were anonymized to ensure confidentiality.
Results:
The study compared the effectiveness of project-based learning (PBL) and
traditional lecture-based instruction in teaching engineering drafting using
AutoCAD, focusing on drafting proficiency, student engagement, and academic
performance. Data were analyzed from 60 second-year undergraduate
engineering students (30 in the PBL group and 30 in the control group).
Drafting proficiency was assessed through pre- and post-tests. The PBL
group showed significant improvement from pre-test (M = 62.4, SD = 8.7) to
post-test (M = 85.6, SD = 6.3), t(29) = 14.72, p < 0.001, with a large effect size
(Cohen’s d = 2.69). The control group also improved (pre-test: M = 61.8, SD =
9.1; post-test: M = 74.2, SD = 7.8), t(29) = 8.45, p < 0.001, d = 1.54, but the PBL
group’s post-test scores were significantly higher than the control group’s, t(58)
= 6.32, p < 0.001, d = 1.63. Table 1 summarizes these results.
Table 1: Pre- and Post-Test Drafting Proficiency Scores
Group
Test
Mean SD
PBL Group
Pre-Test 62.4
8.7
PBL Group
Post-Test 85.6
6.3
Control Group Pre-Test 61.8
9.1
Control Group Post-Test 74.2
7.8
Note: Between-Group Difference (Post-Test): t(58) = 6.32, p < 0.001
Student engagement was measured via a 20-item survey. The PBL group
reported higher engagement (M = 4.12, SD = 0.45) compared to the control
group (M = 3.45, SD = 0.52), U = 672, p < 0.001. Key survey items showed PBL
students rated task relevance (M = 4.35, SD = 0.41) and collaborative learning
(M = 4.28, SD = 0.39) significantly higher than the control group (task relevance:
M = 3.62, SD = 0.50; collaboration: M = 3.15, SD = 0.47), p < 0.01. Figure 1
illustrates these differences.
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Academic performance, based on final course grades, was significantly
higher in the PBL group (M = 88.5, SD = 5.2) compared to the control group (M =
79.3, SD = 6.8), F(1, 58) = 22.47, p < 0.001, η² = 0.28. Qualitative data from
interviews revealed that PBL students valued the practical, industry-relevant
projects, with 80% noting improved confidence in AutoCAD application (e.g.,
“The projects felt like real engineering work”). Control group students reported
lower motivation, with 60% citing repetitive exercises as a challenge. Thematic
analysis identified three key themes: practical skill development (PBL), task
relevance (PBL), and limited engagement (control). Table 2 presents the
frequency of these themes.
Table 2: Qualitative Themes from Student Interviews
Theme
PBL Group Control Group
Practical Skill Development
24/30
8/30
Task Relevance
22/30
10/30
Limited Engagement
4/30
18/30
Overall, the PBL group outperformed the control group across all measured
outcomes, with the chart and tables highlighting the superior impact of PBL on
drafting skills and engagement.
Conclusion:
This study demonstrates that project-based learning (PBL) significantly
enhances the teaching of engineering drafting using AutoCAD, outperforming
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traditional lecture-based methods across multiple dimensions. The results
indicate that students engaged in PBL achieved higher drafting proficiency, with
post-test scores (M = 85.6) substantially surpassing those of the control group
(M = 74.2, p < 0.001). Additionally, PBL students reported greater engagement
(M = 4.12 vs. 3.45, p < 0.001), particularly in task relevance and collaborative
learning, and earned higher final grades (M = 88.5 vs. 79.3, p < 0.001).
Qualitative findings further underscore PBL’s ability to foster practical skills and
confidence in applying AutoCAD to real-world engineering scenarios, as
evidenced by student feedback highlighting the authenticity of project tasks.
These findings have significant implications for engineering education. By
integrating PBL into AutoCAD-based drafting curricula, educators can better
prepare students for industry demands, where collaborative problem-solving
and precise technical drawing are critical. The success of PBL suggests that
active, contextual learning environments can bridge the gap between theoretical
instruction and professional practice, enhancing both technical and soft skills.
However, the approach requires careful implementation, including adequate
instructor training and access to AutoCAD resources, to ensure scalability across
diverse educational settings.
Future research should explore the long-term impacts of PBL on students’
professional performance in engineering roles, particularly in diverse disciplines
such as civil or architectural drafting. Additionally, studies could investigate the
role of digital tools beyond AutoCAD, such as Microsoft Publisher or other CAD
platforms, in enhancing PBL outcomes. Comparative analyses across different
student demographics or institutional contexts could further validate the
generalizability of these findings. Ultimately, this study advocates for a shift
toward student-centered, project-driven pedagogies in engineering drafting
education to cultivate skilled, industry-ready professionals.
