Screening: is an Impact Assessment needed?
The first step in the impact assessment process is to decide whether an assessment is necessary. This is known as ‘screening’ and results in a screening decision. Any proposed action should be examined as early as possible to understand whether it is likely to affect a
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List.
’s OUV and other heritage/conservation values. When the screening process indicates that a proposed action would potentially have negative impacts, an impact assessment is required and the proponent should be encouraged to review the proposed action and revise it, if necessary, to avoid or minimize those impacts.
Screening
Screening is the first step in the impact assessment process, and helps to decide whether an assessment is necessary. When the screening process indicates that a proposed action would potentially have negative impacts on a
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List.
’s OUV and other values, an impact assessment is required and the proponent should be encouraged to review the proposed action and revise it, if necessary, to avoid or minimize those potential impacts in the early stages.
involves consideration of the type, size and characteristics of the proposed action; the sensitivity of the receiving environment; and the types of likely impacts (Figure 6.4). It is not only large development projects, or proposed actions near a
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List.
, that need impact assessment. As World Heritage properties are of international importance, any proposed action that may affect the property’s OUV should require an impact assessment, regardless of its size or location – within the property, its buffer zone or wider setting (see Section 3.2). A series of smaller proposed actions, while not needing impact assessment on their own, may also need to be checked for their indirect and cumulative impacts on a
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List.
.
The screening analysis should consider whether the proposed action could affect the values and attributes that underpin OUV (see Section 3.2). Understanding a
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List.
should therefore begin with an analysis of its Statement of Outstanding Universal Value (SOUV) to identify its values and attributes. Tool 1 provides a structured approach to identifying values and attributes based on an SOUV.

Figure 6.4.
Factors
Everything that can affect, positively and negatively, the values and attributes of the heritage place and its state of conservation. Negative factors are usually called threats.
How factors affect a property needs to be analysed through a series of parameters namely the underlying causes that are the source of the factor, their origin (if originating within or outside the property), the current and potential impacts deriving from the factor and the extent and severity of the impacts on the attributes of the heritage place.
that should be taken into consideration in impact assessment screening in a World
Heritage
All inherited assets which people value for reasons beyond mere utility. Heritage is a broad concept and includes shared legacies from the natural environment, the creations of humans and the creations and interactions between humans and nature. It encompasses built, terrestrial, freshwater and marine environments, landscapes and seascapes, biodiversity, geodiversity, collections, cultural practices, knowledge, living experiences, etc.
context. Potential impacts on OUV require explicit consideration.
Where the screening stage suggests that no impact assessment is necessary, the proponent should prepare a screening report, based on existing information, that documents:
- The
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List. ’s name and a map showing its boundary, buffer zone and (where appropriate) wider setting - The
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List. ’s Statement of Outstanding Universal Value - The values shown by the
World Heritage property
A cultural, natural or mixed heritage place inscribed on the World Heritage List and therefore considered to be of OUV for humanity. The responsibility for nominating a property to the World Heritage List falls upon the State(s) Party(ies) where it is located. The World Heritage Committee decides whether a property should be inscribed on the World Heritage List, taking into account the technical recommendations of the Advisory Bodies following rigorous evaluation processes.
When used as a general term, World Heritage refers to all the natural, cultural and mixed properties inscribed on the World Heritage List. - The attributes that underpin each value
- For each attribute: whether the proposed action will significantly affect that attribute or not. Where there is uncertainty about this, a precautionary approach should be used.
The World Heritage All inherited assets which people value for reasons beyond mere utility. Heritage is a broad concept and includes shared legacies from the natural environment, the creations of humans and the creations and interactions between humans and nature. It encompasses built, terrestrial, freshwater and marine environments, landscapes and seascapes, biodiversity, geodiversity, collections, cultural practices, knowledge, living experiences, etc. Committee has decided that two activities are never considered compatible with World Heritage All inherited assets which people value for reasons beyond mere utility. Heritage is a broad concept and includes shared legacies from the natural environment, the creations of humans and the creations and interactions between humans and nature. It encompasses built, terrestrial, freshwater and marine environments, landscapes and seascapes, biodiversity, geodiversity, collections, cultural practices, knowledge, living experiences, etc. status: extractive activities16 and the construction of dams with large reservoirs. The International Council on Mining and Metals has issued a ‘No-go commitment’ not to explore or exploit for oil, gas or minerals in World Heritage All inherited assets which people value for reasons beyond mere utility. Heritage is a broad concept and includes shared legacies from the natural environment, the creations of humans and the creations and interactions between humans and nature. It encompasses built, terrestrial, freshwater and marine environments, landscapes and seascapes, biodiversity, geodiversity, collections, cultural practices, knowledge, living experiences, etc. properties, and to ensure operations adjacent to World Heritage All inherited assets which people value for reasons beyond mere utility. Heritage is a broad concept and includes shared legacies from the natural environment, the creations of humans and the creations and interactions between humans and nature. It encompasses built, terrestrial, freshwater and marine environments, landscapes and seascapes, biodiversity, geodiversity, collections, cultural practices, knowledge, living experiences, etc. properties are not incompatible with OUV. The International Hydropower Association has similarly committed to a no-go for World Heritage All inherited assets which people value for reasons beyond mere utility. Heritage is a broad concept and includes shared legacies from the natural environment, the creations of humans and the creations and interactions between humans and nature. It encompasses built, terrestrial, freshwater and marine environments, landscapes and seascapes, biodiversity, geodiversity, collections, cultural practices, knowledge, living experiences, etc. and a ‘Duty of care commitment’. Leading global companies have joined this commitment, including mining, oil and gas, insurance and banks. Therefore, a recommendation not to proceed with proposed actions of this type can be made at the screening stage. In addition, any proposed dam that could affect properties located within the same river basin will always require an assessment in order to avoid impacts on OUV.
The World Heritage Committee may also request an impact assessment, for example, after it has received notification of proposed or ongoing action via the UNESCO
World Heritage Centre
The UNESCO World Heritage Centre is a technical administrative body within UNESCO, established in 1992 and appointed by the Director-General of UNESCO. It acts as the Secretariat of the
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
, is the focal point and coordinator within UNESCO for all matters related to World Heritage, and ensures the day-to-day management of the Convention.
, in line with Paragraph 172 or 174 of the Operational Guidelines. If the Committee requests an impact assessment, this becomes the responsibility of the State Party concerned.
States Parties
The countries which have adhered to the Convention Concerning the Protection of the World Cultural and Natural Heritage (
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
) (UNESCO, 1972).
can use the screening process as an opportunity to proactively inform the UNESCO
World Heritage Centre
The UNESCO World Heritage Centre is a technical administrative body within UNESCO, established in 1992 and appointed by the Director-General of UNESCO. It acts as the Secretariat of the
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
, is the focal point and coordinator within UNESCO for all matters related to World Heritage, and ensures the day-to-day management of the Convention.
of any proposed actions which may affect a property’s OUV, in line with Paragraph 172 of the Operational Guidelines (Section 3.3). The
National Focal Point
Governmental organization(s) primarily responsible for ensuring the implementation of activities related to the Convention within their countries, and which act as the communication channel between the Secretariat (UNESCO
World Heritage Centre
The UNESCO World Heritage Centre is a technical administrative body within UNESCO, established in 1992 and appointed by the Director-General of UNESCO. It acts as the Secretariat of the
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
, is the focal point and coordinator within UNESCO for all matters related to World Heritage, and ensures the day-to-day management of the Convention.
), national public authorities and other stakeholders.
is also expected to follow up on implementation of the World Heritage Committee Decisions and Recommendations of the
Advisory Bodies
The three international organizations which are named in the
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
to advise the World Heritage Committee in its deliberations are ICCROM (International Centre for the Study of the Preservation and Restoration of Cultural Property), ICOMOS (International Council on Monuments and Sites) and IUCN (International Union for Conservation of Nature).
The Advisory Bodies have the following functions:
Advise on the implementation of the
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
in the field of their expertise
Provide expert advice on how to conserve and manage properties included on the World Heritage List
Assist the
World Heritage Centre
The UNESCO World Heritage Centre is a technical administrative body within UNESCO, established in 1992 and appointed by the Director-General of UNESCO. It acts as the Secretariat of the
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
, is the focal point and coordinator within UNESCO for all matters related to World Heritage, and ensures the day-to-day management of the Convention.
in preparing the Committee’s documentation, the agendas of its meetings and in implementing the Committee’s decisions
Assist with the development and implementation of the Global Strategy for a Representative, Balanced and Credible World Heritage List, the World Heritage Capacity Building Strategy, Periodic Reporting, and the strengthening of the effective use of the World Heritage Fund
Monitor the state of conservation of World Heritage properties (including through Reactive Monitoring missions at the request of the Committee and Advisory missions at the invitation of the
States Parties
The countries which have adhered to the Convention Concerning the Protection of the World Cultural and Natural Heritage (
World Heritage Convention
The Convention Concerning the Protection of the World Cultural and Natural Heritage is an international treaty adopted by the UN in 1972 that defines the kind of natural or cultural sites which can be considered for inscription on the World Heritage List for their Outstanding Universal Value for all humankind. Commonly known as the World Heritage Convention, it establishes how the international community as a whole is responsible for
the protection of such heritage and sets out the duties of States Parties in identifying potential sites that may be eligible for inscription onto the World Heritage List and their role in protecting and preserving them. By signing the Convention, each country pledges to conserve not only the sites situated on its territory that have been recognized as being of Outstanding Universal Value, but also to protect its national heritage and to be involved in international efforts to protect, conserve and promote the heritage of humankind.
) (UNESCO, 1972).
)
Review requests for International Assistance
Attend meetings of the World Heritage Committee and the Bureau in an advisory capacity.
The Advisory Bodies are involved in the review of proposed actions and and any related impact assessments when they are requested by the World Heritage Committee.
in this regard.