basic guidelines	intro	app				intermediate guidelines	intro	app
	1	Define a standard document structure	M-H	L			2	Look for domain constraints	L	M
	1	Explain how to use document	VL	VL			2	Record requirements rationale	L	L-M
	1	Include a summary of the requirements	VL	L			2	Collect requirements from multiple viewpoints	M-H	M
	1	Make a business case for the system	VL	VL			2	Prototype poorly understood requirements	M	L-H
	1	Define specialised terms	L	L-M			2	Use scenarios	FH	L
	1	Lay out the document for readibility	L	L			2	Define operational processes	FH	M
	1	Help readers find information	VL	L-M			3	Classify requirements using using a multidimensional approach	L-M	M
	1	Make the document easy to change	L	VL			3	Use interaction matrices to find conflicts and overlaps	L	M-H
	2	Assess system feasibility	L	L-M			4	Specify requirements quantitatively	L-M	L-M
	2	Be sensitive to organisational & political considerations	L	VL			5	Use structured methods for system modelling	M-H	M
	2	Identify and consult stakeholders	VL	L			5	Use a data dictionary	M	L
	2	Record requirement sources	L	L			5	Document the links between stakeholder requirements and system models	L	M
	2	Define operating environment	L	L			6	Use prototyping to animate requirements	M-H	M-H
	2	Use business concerns to drive requirements elicitation	L	L			6	Write a draft user manual	L	M
	3	Define system boundaries	L	L			6	Propose requirements test cases	L	M
	3	Use checklists for requirements analysis	L-M	L			7	Use a database to manage requirements	M-H	M
	3	Provide software to support negotiations	L-M	L-M			7	Define change management policies	M-H	L-M
	3	Plan for conflicts and conflict resolution	L	L			7	Identify global system requirements	L	L
	3	Prioritise requirements	L	L			8	Identify and analyse hazards	M-H	M-H
	4	Define standard templates for describing requirements	M	L			8	Derive safety requirements from hazard analysis	L	M
	4	Use language simply & concisely	FL	L-M			8	Cross-check operational and functional requirements against safety req.	L	M
	4	Use diagrams appropriately	L	L
	4	Supplement natural language with other descriptions of req.	VL	L				advanced guidelines
	5	Develop complementary system models	L-M	M			2	Reuse requirements	M-H	M
	5	Model the system’s environment	L	L			3	Assess requirements risks	M	M
	5	Model the system architecture	L-M	L			6	Paraphrase system models	M-H	M
	6	Check that the requirements document meets your standard	L	L			7	Identify volatile requirements	L	L
	6	Organise formal requirements inspections	M	M			7	Record rejected requirements	L	L
	6	Use multidisciplinary teams to review requirements	L	L			8	Specify systems using formal specification	H	H
	6	Define validation checklists	L-M	L			8	Collect incident experience	H	H
	7	Uniquely identify each requirement	VL	VL			8	Learn from incident experience	H	H
	7	Define policies for requirements management	M	L			8	Establish an organisational safety culture	H	N
	7	Define traceability policies	M	M-H
	7	Maintain a traceability manual	L	M-H			1	The Requirements Document
	8	Create safety requirements checklists	L-M	L			2	Requirements Elicitation
	8	Involve external reviewers in the validation process	L	L-M			3	Requirements Analysis and Negotiation
							4	Describing Requirements
							5	System Modelling
							6	Requirements Validation
							7	Requirements Management
							8	Requirements Engineering for Critical Systems