Professional Engineer, Construction Division | Soil Mechanics and Foundation Engineering R07 Elective Subject III Model Answers (III-1/III-2)

These are model answers corresponding to the revised competencies for the 2026 fiscal year.

This article reflects the following revision points in the answers for both questions.

• Utilization of data and information technology: Specifically demonstrate 3D measurement, sensors, and geotechnical databases as the basis for identifying issues and solutions.

• Incorporating stakeholder opinions and consensus building: Clearly state the consultation process with local residents, facility managers, and relevant administrative agencies in the solutions.

• Achieving sustainable outcomes: Discuss residual risks from the three perspectives of society, economy, and environment, and aim for sustainable outcomes that include cultural value.

For details on the revised competencies, please see Explanation of the Professional Engineer Second-Stage Examination Competency Revision (2026 Fiscal Year).

This article is for the following people:

• Those who have taken the 2025 Professional Engineer Second-Stage Examination in the Construction Division (Soil Mechanics and Foundation Engineering) and are preparing for Elective Subject III.

• Those who want to check model answers for both III-1 and III-2 so they can handle either question chosen on the actual exam, as III requires selecting one out of two questions.

• Those who want to know how to discuss important themes like Geotechnical DX (III-1) and Liquefaction Damage Mitigation (III-2) from the perspective of an administrator (client) involved in ordering and supervising soil and foundation work.

• Those who want to confirm the volume of three answer sheets (within approximately 1,800 characters) and the three-stage structure of 'three issues -> solutions for the most important issue -> measures for residual risks'.

• Those who want to refer to the framework of an argument that combines specialized technology with policy and consensus building from the perspective of a client (government).

What you will learn in this article:

• The full text of the 2025 Soil Mechanics and Foundation Engineering Elective Subject III questions (both III-1 and III-2 are reprinted in the article).

• Argument strategies for the three-stage structure of 'issue identification -> solutions for the most important issue -> measures for residual risks' for both III-1 (productivity improvement through DX of geotechnical structures) and III-2 (liquefaction damage mitigation for existing structures).

• Argument axes unique to the government (client) in ordering and supervising soil and foundation work.

• Full model answers for both questions (approximately 1,600 characters each) and checkpoints from the grader's perspective.

• Includes a PDF that allows you to print the questions and full model answers (can be used for handwriting practice on answer sheets).

This article provides model answers for both questions III-1 and III-2 of the 2025 Professional Engineer Second-Stage Examination, Construction Division (Soil Mechanics and Foundation Engineering), based on practical experience as a former public servant (client) involved in ordering and supervising soil and foundation work.

Elective Subject III is a subject that tests problem-solving ability, and you will write an argument using three answer sheets (within approximately 1,800 characters) in a three-stage structure of issue identification, solutions, and measures for residual risks.

In the actual exam, you will choose one of the two questions to answer, but this article covers both questions asked so that you can handle whichever one you choose.

Each answer is structured to address the points required by the question through a logical chain of 'current situation/issues → solutions → risks/countermeasures,' demonstrating how to incorporate the client's unique perspective on facility management and consensus building into your response.

You can view a list of other articles and model answers by subject for the Construction Division from the 'Construction Division Table of Contents'.