For consultancy services, several ISO standards are important, depending on the specific type of consultancy provided. However, one of the most universally significant ISO standards for consultancy services is ISO 20700.

ISO 20700: Guidelines for Management Consultancy Services

ISO 20700 provides guidelines for effective management consultancy services. It helps consultancy firms ensure they deliver high-quality services, focusing on:

1. Transparency and ethics in consultancy practices.
2. Consistency and quality of service delivery.
3. Continuous improvement and learning within consultancy firms.
4. Enhanced customer satisfaction and trust.

Other Relevant ISO Standards

Depending on the consultancy's focus, other ISO standards might also be crucial:

ISO 9001: Quality Management Systems

Applies to any organization, including consultancies, to ensure consistent quality in service delivery and customer satisfaction.

ISO 31000: Risk Management

Essential for consultancy services that involve risk management and assessment.

ISO 14001: Environmental Management Systems

Important for consultancies focusing on environmental management and sustainability.

ISO 27001: Information Security Management Systems

Critical for consultancies dealing with information security and data protection.

ISO 45001: Occupational Health and Safety Management Systems

Relevant for consultancies providing services related to health and safety management.

Choosing the right ISO standard(s) depends on the specific nature of the ISO consultancy services provided and the client's needs.