1. ISO 31000:2018, Risk management — Guidelines, Clause 4, Principles. The standard states, "The purpose of risk management is the creation and protection of value. It improves performance, encourages innovation and supports the achievement of objectives." An "enhanced" system is one that successfully fulfills this purpose.
2. Leitch, M. (2010). "ISO 31000:2009—The new international standard on risk management". Risk Analysis: An International Journal, 30(6), 887-892. The paper discusses how the standard provides a basis for organizations to improve and enhance their risk management practices to better support the achievement of objectives (p. 888, Section 2). DOI: https://doi.org/10.1111/j.1539-6924.2010.01426.x
3. Purdy, G. (2010). "ISO 31000:2009—Setting a New Standard for Risk Management". Risk Analysis, 30(6), 881-886. This article explains that ISO 31000 is designed to help organizations enhance the likelihood of achieving objectives by managing uncertainty effectively (p. 882, Introduction). DOI: https://doi.org/10.1111/j.1539-6924.2010.01442.x