Smith, A., & Johnson, B. (2024). The Effects of Tardiness on Academic Achievement: A Longitudinal Study. *Journal of Educational Psychology, 130(2), 201-215.

This reference appears to be a citation for a journal article. To summarize its content, one might consider the following points:

1. Purpose of the Study: The article likely investigates how tardiness affects students' academic performance over time, examining both immediate and long-term impacts.

2. Methodology: It may detail a longitudinal study design, indicating that data was collected over a period to observe changes and trends associated with students’ punctuality and academic outcomes.

3. Findings: The results may indicate a correlation between increased tardiness and lower academic achievement, highlighting critical periods during educational development where punctuality may be particularly influential.

4. Implications: The research could suggest interventions aimed at reducing tardiness, thereby promoting better academic results. It may also call for further research into the underlying causes of tardiness among students.

5. Conclusion: This study presumably contributes to a better understanding of educational psychology by linking behavior (tardiness) with quantifiable academic indicators.

For more detailed insights, one would need to access the full text of the article.