Performance specification - Revision history

Designing Buildings at 10:34, 13 October 2022

2022-10-13T10:34:48Z

← Older revision		Revision as of 10:34, 13 October 2022
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	However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.		However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.
		+
		+	The [https://www.gov.uk/government/publications/geospatial-glossary/geospatial-glossary Geospatial Glossary], published by the Geospatial Commission, and accessed on 17 September 2022, defines an open specification as: ‘A specification that promotes interoperability through its public availability to developers, who use it to develop software or hardware compatible with the common resource described in the specification. Open specifications are generally consistent with related standards and are updated to conform with new standards and new technologies. They may be developed and maintained, as in the case of OpenGIS Specifications, by a public open consensus process.’

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =

Designing Buildings at 11:06, 28 December 2021

2021-12-28T11:06:51Z

Designing Buildings at 12:49, 1 September 2020

2020-09-01T12:49:37Z

← Older revision		Revision as of 12:49, 1 September 2020
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	* [http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf OGC: Whole-life costing and cost management].		* [http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf OGC: Whole-life costing and cost management].

−	[[Category:Contracts_/_payment]] [[Category:Design]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Contracts_/_payment]] [[Category:Design]]

Designing Buildings at 11:54, 10 March 2020

2020-03-10T11:54:03Z

← Older revision		Revision as of 11:54, 10 March 2020
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	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =

−	* Briefing documents.
−	* Bills of quantities.
−	* Building performance.
−	* Contract documents.
	* Contractor's designed portion.		* Contractor's designed portion.
		+	* Final specifications.
	* Insulation specification.		* Insulation specification.
	* Outline specification.		* Outline specification.

Editor at 17:11, 13 May 2019

2019-05-13T17:11:27Z

← Older revision		Revision as of 17:11, 13 May 2019
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	* Specification basics.		* Specification basics.
	* Tender.		* Tender.
		+	* Track record.
	* [[What_should_be_included_in_a_scope_of_work%3F\|What should be included in a scope of work?]]		* [[What_should_be_included_in_a_scope_of_work%3F\|What should be included in a scope of work?]]

Designing Buildings at 09:17, 23 January 2019

2019-01-23T09:17:56Z

← Older revision		Revision as of 09:17, 23 January 2019
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	However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.		However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Briefing documents.		* Briefing documents.
	* Bills of quantities.		* Bills of quantities.
		+	* Building performance.
	* Contract documents.		* Contract documents.
	* Contractor's designed portion.		* Contractor's designed portion.

Editor at 13:35, 31 August 2018

2018-08-31T13:35:16Z

← Older revision		Revision as of 13:35, 31 August 2018
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	* Outline specification.		* Outline specification.
	* Output-based specification.		* Output-based specification.
		+	* Performance.
	* Prescriptive specification.		* Prescriptive specification.
	* Production information.		* Production information.

Editor at 12:05, 21 August 2018

2018-08-21T12:05:07Z

← Older revision		Revision as of 12:05, 21 August 2018
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	Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.		Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.

−	Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to prescriptive (closed) specifications where the design is already complete when the project is tendered.	+	Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to [[Prescriptive_specification\|prescriptive (closed) specifications]] where the design is already complete when the project is tendered.

−	Prescriptive specifications give the client more certainty about the end product when they make their final investment decision (i.e. when they appoint the contractor), whereas a performance specification gives the contractor and suppliers more scope to innovate and adopt cost effective methods of work, potentially offering better value for money.	+	[[Prescriptive_specification\|Prescriptive specifications]] give the client more certainty about the end product when they make their final investment decision (i.e. when they appoint the contractor), whereas a performance specification gives the contractor and suppliers more scope to innovate and adopt cost effective methods of work, potentially offering better value for money.

−	Typically, performance specifications are written on projects that are straight-forward, standard building types, whereas prescriptive specifications are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where certainty regarding the exact nature of the completed development is more important to the client.	+	Typically, performance specifications are written on projects that are straight-forward, standard building types, whereas [[Prescriptive_specification\|prescriptive specifications]] are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where certainty regarding the exact nature of the completed development is more important to the client.

−	An exception to this might be a repeat client such as a large retailer, where a specific, branded end result is required and so whilst the building type is well known, the specification is likely to be prescriptive.	+	An exception to this might be a repeat client such as a large retailer, where a specific, branded end result is required and so whilst the building type is well known, the specification is likely to be [[Prescriptive_specification\|prescriptive]].

−	In fact, most projects will involve a combination of performance and prescriptive specifications, where items crucial to the design will be specified prescriptively (such as external cladding) whilst less critical items, or items requiring specialist design are specified only by performance (such as service lifts).	+	In fact, most projects will involve a combination of performance and prescriptive specifications, where items crucial to the design will be specified prescriptively (such as external cladding), whilst less critical items, or items requiring specialist design are specified only by performance (such as service lifts).

−	Key to deciding whether to specify a component of the building prescriptively or not is considering who is best placed to select that components, i.e. who is most likely to achieve best value, the client, the designers, the contractor or suppliers. Large clients may be able to procure certain products at competitive rates themselves (for example the government).	+	Key to deciding whether to specify a component of the building prescriptively or not is considering who is best placed to select that components, i.e. who is most likely to achieve best value, the client, the designers, the contractor or suppliers. Large clients may be able to procure certain products at competitive rates themselves (for example, the government).

	Designers may have particular experience of using a specific product (although some clients may not allow designers to specify particular products as they believe it restricts competition and innovation and may relieve the contractor of their liability for 'fitness for purpose').		Designers may have particular experience of using a specific product (although some clients may not allow designers to specify particular products as they believe it restricts competition and innovation and may relieve the contractor of their liability for 'fitness for purpose').
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	* Outline specification.		* Outline specification.
	* Output-based specification.		* Output-based specification.
		+	* Prescriptive specification.
	* Production information.		* Production information.
	* Project brief.		* Project brief.
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	* Specification basics.		* Specification basics.
	* Tender.		* Tender.
−	* [[What_should_be_included_in_a_scope_of_work?\|What should be included in a scope of work?]]	+	* [[What_should_be_included_in_a_scope_of_work%3F\|What should be included in a scope of work?]]

	=== External references. ===		=== External references. ===

Editor at 11:23, 21 August 2018

2018-08-21T11:23:19Z

← Older revision		Revision as of 11:23, 21 August 2018
Line 49:		Line 49:
	* Specification basics.		* Specification basics.
	* Tender.		* Tender.
−	* What should be included in a scope of work?	+	* [[What_should_be_included_in_a_scope_of_work?\|What should be included in a scope of work?]]

	=== External references. ===		=== External references. ===

	* [http://www.ribabookshops.com/item/the-jct-guide-to-the-use-of-performance-specifications/24298/ The JCT Guide to the Use of Performance Specifications].		* [http://www.ribabookshops.com/item/the-jct-guide-to-the-use-of-performance-specifications/24298/ The JCT Guide to the Use of Performance Specifications].
−	* ~~nbs~~: [http://www.thenbs.com/training/educator/briefs/briefsIntro/briefsIntro04.asp Briefs 4. Prescription or performance].	+	* NBS: [http://www.thenbs.com/training/educator/briefs/briefsIntro/briefsIntro04.asp Briefs 4. Prescription or performance].
	* [http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf OGC: Whole-life costing and cost management].		* [http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf OGC: Whole-life costing and cost management].

	[[Category:Contracts_/_payment]] [[Category:Design]]		[[Category:Contracts_/_payment]] [[Category:Design]]

Editor at 11:42, 20 July 2018

2018-07-20T11:42:49Z

← Older revision		Revision as of 11:42, 20 July 2018
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−	[[File:Documents.jpg]]	+	[[File:Documents.jpg\|link=File:Documents.jpg]]

	Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.		Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.
Line 17:		Line 17:
	Designers may have particular experience of using a specific product (although some clients may not allow designers to specify particular products as they believe it restricts competition and innovation and may relieve the contractor of their liability for 'fitness for purpose').		Designers may have particular experience of using a specific product (although some clients may not allow designers to specify particular products as they believe it restricts competition and innovation and may relieve the contractor of their liability for 'fitness for purpose').

−	Performance (open) specifications describe the result that is required from particular items and leave it to the contractor or supplier to satisfy that requirement. In effect it requires the contractor or supplier to complete the design. The nature of the performance required may be defined by the desired outcome, or by reference to standards (in this case it is important to ensure that the standards referred to are up to date, and this can be done by subscribing to services such as [http://www.thenbs.com ~~nbs~~]).	+	Performance (open) specifications describe the result that is required from particular items and leave it to the contractor or supplier to satisfy that requirement. In effect it requires the contractor or supplier to complete the design. The nature of the performance required may be defined by the desired outcome, or by reference to standards (in this case it is important to ensure that the standards referred to are up to date, and this can be done by subscribing to services such as [http://www.thenbs.com NBS]).

	It is important when defining performance to:		It is important when defining performance to:
Line 27:		Line 27:
	* Ensure where there are elements of prescriptive and performance specification that performance items can be properly integrated into the rest of the works.		* Ensure where there are elements of prescriptive and performance specification that performance items can be properly integrated into the rest of the works.

−	NB. In the public sector, the government prefers that tendering takes place after the project brief has been prepared, i.e. before any design studies have been undertaken. Tenders are based on an output-based specification setting out only the functional requirements for the development and not prescribing how those requirements should be achieved (see [http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf OGC: Whole-life costing and cost management]).	+	NB: In the public sector, the government prefers that tendering takes place after the project brief has been prepared, i.e. before any design studies have been undertaken. Tenders are based on an output-based specification setting out only the functional requirements for the development and not prescribing how those requirements should be achieved (see [http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf OGC: Whole-life costing and cost management]).

	However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.		However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.
Line 49:		Line 49:
	* Specification basics.		* Specification basics.
	* Tender.		* Tender.
		+	* What should be included in a scope of work?

	=== External references. ===		=== External references. ===

← Older revision		Revision as of 11:06, 28 December 2021
Line 3:		Line 3:
	Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.		Specifications are written documents that describe the materials and workmanship required for a development. They do not include cost, quantity or drawn information but need to be read alongside other contract documentation such as quantities, schedules and drawings.

−	Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to ~~[[Prescriptive_specification\|~~prescriptive (closed) specifications]] where the design is already complete when the project is tendered.	+	Specifications vary considerably depending on the stage to which the design has been developed, ranging from performance (open) specifications that require further design by a contractor or supplier, to prescriptive (closed) specifications where the design is already complete when the project is tendered.

−	~~[[Prescriptive_specification\|~~Prescriptive specifications]] give the client more certainty about the end product when they make their final investment decision (i.e. when they appoint the contractor), whereas a performance specification gives the contractor and suppliers more scope to innovate and adopt cost effective methods of work, potentially offering better value for money.	+	Prescriptive specifications give the client more certainty about the end product when they make their final investment decision (i.e. when they appoint the contractor), whereas a performance specification gives the contractor and suppliers more scope to innovate and adopt cost effective methods of work, potentially offering better value for money.

−	Typically, performance specifications are written on projects that are straight-forward, standard building types, whereas ~~[[Prescriptive_specification\|~~prescriptive specifications]] are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where certainty regarding the exact nature of the completed development is more important to the client.	+	Typically, performance specifications are written on projects that are straight-forward, standard building types, whereas prescriptive specifications are written for more complex buildings, or buildings where the client has requirements that might not be familiar to contractors and where certainty regarding the exact nature of the completed development is more important to the client.

−	An exception to this might be a repeat client such as a large retailer, where a specific, branded end result is required and so whilst the building type is well known, the specification is likely to be ~~[[Prescriptive_specification\|~~prescriptive]].	+	An exception to this might be a repeat client such as a large retailer, where a specific, branded end result is required and so whilst the building type is well known, the specification is likely to be prescriptive.

	In fact, most projects will involve a combination of performance and prescriptive specifications, where items crucial to the design will be specified prescriptively (such as external cladding), whilst less critical items, or items requiring specialist design are specified only by performance (such as service lifts).		In fact, most projects will involve a combination of performance and prescriptive specifications, where items crucial to the design will be specified prescriptively (such as external cladding), whilst less critical items, or items requiring specialist design are specified only by performance (such as service lifts).
Line 17:		Line 17:
	Designers may have particular experience of using a specific product (although some clients may not allow designers to specify particular products as they believe it restricts competition and innovation and may relieve the contractor of their liability for 'fitness for purpose').		Designers may have particular experience of using a specific product (although some clients may not allow designers to specify particular products as they believe it restricts competition and innovation and may relieve the contractor of their liability for 'fitness for purpose').

−	Performance (open) specifications describe the result that is required from particular items and leave it to the contractor or supplier to satisfy that requirement. In effect it requires the contractor or supplier to complete the design. The nature of the performance required may be defined by the desired outcome, or by reference to standards (in this case it is important to ensure that the standards referred to are up to date, and this can be done by subscribing to services such as ~~[http://www.thenbs.com~~ NBS]).	+	Performance (open) specifications describe the result that is required from particular items and leave it to the contractor or supplier to satisfy that requirement. In effect it requires the contractor or supplier to complete the design. The nature of the performance required may be defined by the desired outcome, or by reference to standards (in this case it is important to ensure that the standards referred to are up to date, and this can be done by subscribing to services such as NBS).

	It is important when defining performance to:		It is important when defining performance to:
Line 27:		Line 27:
	* Ensure where there are elements of prescriptive and performance specification that performance items can be properly integrated into the rest of the works.		* Ensure where there are elements of prescriptive and performance specification that performance items can be properly integrated into the rest of the works.

−	NB: In the public sector, the government prefers that tendering takes place after the project brief has been prepared, i.e. before any design studies have been undertaken. Tenders are based on an output-based specification setting out only the functional requirements for the development and not prescribing how those requirements should be achieved ~~(see [http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf OGC: Whole-life costing and cost management])~~.	+	NB: In the public sector, the government prefers that tendering takes place after the project brief has been prepared, i.e. before any design studies have been undertaken. Tenders are based on an output-based specification setting out only the functional requirements for the development and not prescribing how those requirements should be achieved.

	However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.		However, as the public sector tends to procure repeat building types such as schools, hospitals, prisons etc. there are a great number of existing standards and codes that specifications can refer to.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Contractor's designed portion.		* Contractor's designed portion.
Line 48:		Line 48:
	* Tender.		* Tender.
	* Track record.		* Track record.
−	* [[What_should_be_included_in_a_scope_of_work%3F\|What should be included in a scope of work?]]

−	=== External references~~. ==~~=	+	= External references =

−	* ~~[http://www.ribabookshops.com/item/the-jct-guide-to-the-use-of-performance-specifications/24298/~~ The JCT Guide to the Use of Performance Specifications].	+	* The JCT Guide to the Use of Performance Specifications.
−	* NBS: ~~[http://www.thenbs.com/training/educator/briefs/briefsIntro/briefsIntro04.asp~~ Briefs 4. Prescription or performance].	+	* NBS: Briefs 4. Prescription or performance.
−	* ~~[http://webarchive.nationalarchives.gov.uk/20100503135839/http://www.ogc.gov.uk/documents/CP0067AEGuide7.pdf~~ OGC: Whole-life costing and cost management].	+	* OGC: Whole-life costing and cost management.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Contracts_/_payment]] [[Category:Design]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Contracts_/_payment]] [[Category:Design]]