Diagnostic test for fundamental process in arithmetic was developed by :

Question

Accepted Answer

The correct answer to the question "Diagnostic test for fundamental process in arithmetic was developed by" is Option 2: G. T. Buswell and Lenore John. Here is a detailed explanation supporting this choice:

1. **Justification for Option 2: G. T. Buswell and Lenore John**
   - G. T. Buswell and Lenore John are recognized for their contributions to educational psychology and the development of diagnostic tools in arithmetic. Their work focused on understanding the cognitive processes involved in arithmetic and creating assessments that could identify specific areas where students might struggle. This diagnostic approach was innovative in its time, as it allowed educators to tailor their teaching strategies to address individual student needs, thereby improving learning outcomes in arithmetic.

2. **Explanation for why other options are incorrect:**

- **Option 1: G. M. Ruch**
     - G. M. Ruch is known for his work in educational measurement and evaluation, but there is no specific evidence linking him to the development of a diagnostic test for fundamental processes in arithmetic. His contributions were more general in the field of educational assessments rather than focused specifically on arithmetic diagnostics.

- **Option 3: Leo J. Bruckner**
     - Leo J. Bruckner's work does not prominently feature the development of diagnostic tests for arithmetic. While he may have contributed to educational research, there is no specific association with the creation of diagnostic tools for arithmetic processes, making this option incorrect.

- **Option 4: Fred J. S. Schonell and F. Eleanor Schonell**
     - Fred J. S. Schonell and F. Eleanor Schonell are known for their work in literacy and educational psychology, particularly in the development of reading tests. Although they made significant contributions to educational diagnostics, their focus was not primarily on arithmetic, which makes this option incorrect in the context of the question.

In conclusion, Option 2 is the correct answer because G. T. Buswell and Lenore John specifically developed diagnostic tests aimed at understanding and improving fundamental processes in arithmetic, distinguishing their work from that of the other individuals listed.