A professional engineer may be commissioned to conduct the professional practice within their engineering branch as planning, design, construction supervision, research, analysis, test, evaluation, appraisal, construction, manufacture, maintenance, inspection, project management and other related services.
The scopes of professional practice of various engineering branches shall be prescribed by the central competent authority in conjunction with the central authorities in charge of the relevant industries.
The system for professional engineer certification shall be enforced for certain specified engineering branches or technical service categories in an effort to upgrade the quality of technical services or safeguard public health and safety. The regulations for certification shall be prescribed by the central competent authority in conjunction with the central authorities in charge of the relevant industries.
When a government agency, a government-owned enterprise, or a public juristic person independantly conducts the professional practice stipulated in Paragraph 1 requiring certification in accordance with other laws, they shall assign their subordinates who have lawfully obtained relevant professional engineer certificates to do so.

A professional engineer designated by government agencies to conduct the professional practice related to public safety, disaster prevention, or disaster rescue shall not refuse without justifiable reasons.
When a government agency designates a professional engineer to conduct the professional practice prescribed in the preceding Paragraph, the necessary fees shall be paid.

A professional engineer, while in professional practice, shall maintain a profession registry book to record technical service and where the practice is conducted, the names or titles and addresses of clients, and circumstances and duration in detail.

All drawings and documents produced by professional engineers in the professional practice shall be signed by themselves and be further affixed with their practice seals. When involving the scopes of professional practice from different engineering branches, they shall be conducted by engineers with corresponding engineering branches, and they shall be indicated responsibility respectively.
A professional engineer shall conduct certification only for the work carried out by themselves or under their supervision. When work involves site operations, the professional engineer shall conduct inspections at the work site in person.
A professional engineer, when conducting certification, shall submit certification report and keep a record of the certification process. The report and record, along with all the relevant data and documents, shall be compiled into worksheets.

In the event that a client of a professional engineer or a business entity where a professional engineer practices changes the finalized project without permission and refuses warnings during the project or after it is carried out, thus resulting in a risk of danger, the professional engineer shall report to the local competent authority according to the facts.

A practicing professional engineer shall not concurrently serve as a civil servant.

A professional engineer shall not:
1. Allow anyone to borrow their name to practice the profession or solicit the professional practice.
2. Breach or neglect obliged duties on commissioned professional practice.
3. Breach laws and regulations related to the professional practice while practicing the profession.
4. Provide unprofessional or false reports or affidavits when conducting an appraisal.
5. Reveal secrets or confidential information obtained from the professional practice without a justifiable reason.
6. Receive unlawful interests or solicit the professional practice by unjustifiable means when practicing the profession.
Provision under preceding Subparagraph 5 remains applicable after the professional practice is discontinued.

Unless otherwise provided by other laws, the professional practice conducted by a professional engineer shall not exceed the scope of the professional practice registered in their professional engineer license.

A professional engineer subject to a suspension penalty shall not practice the profession during the suspension period.

A professional engineer, while in professional practice, shall accept professional training programs as required by the competent authority.

The central competent authority and the central authorities in charge of the relevant industries, for supervision on professional engineer’s practice, are entitled to conduct a practice audit to inspect professional engineer’s practice or order them to report, and provide verified documents, account reports and other relevant data. The professional engineers shall not refuse or circumvent the audit.
The practice audit stipulated in the preceding Paragraph may be commissioned to professional institutions or associations.
A professional engineer practicing the profession under Article 7, Paragraph 1, Subparagraph 1 or 3, shall submit the annual practice report to the central competent authority for reference within six months from the day after the end of a fiscal year.
The annual practice report stipulated in the preceding Paragraph may be processed electronically; its transmission format and computer database shall be specified by the central competent authority. If there is any error in the content of the transmitted information, the professional engineer shall correct it immediately.