There are three basic groups of WLC (whole life-cycle costing) models:
- Decision support models
- Simulation models: Life cycle cost is an essential approach to decide on alternative rehabilitation strategies for infrastructure systems. Monte Carlo simulation approach is used to develop a stochastic life cycle cost (SLCC) model and methodology in order to compare different rehabilitation scenarios/alternatives for infrastructures, such as water mains. This method assumes that some inputs are randomly variable in a range of values.
- Optimisation models
Reference:
LO 1, AC 1.2

Internal stakeholders may contribute to defining needs and drafting the specification by using their technical expertise. In this scenario, IT team may consult procurement team on the technical specification of the software, including compatibility with company's current IT system.

Quality function deployment (QFD) is a method to transform qualitative user demands into quantitative parameters, to deploy the functions forming quality, and to deploy methods for achieving the design quality into subsystems and component parts, and ultimately to specific elements of the manufacturing process.
Kano model of excitement and basic quality (Kano et al, 1984; Berger et al, 1993; Matzler et al, 1996) brings a different perspective for the analysis of improvement opportunities in products and services because it takes in consideration the asymmetrical and non-linear relationship between performance and satisfaction. The Kano model classifies customers requirements in five categories: basic requirements, performance requirements, attractive requirements, indifferent requirements and reverse requirements.
Mendelow's Matrix is a tool that may be used by an organisation to consider the attitude of their stakeholders at the start of a project or when they are setting out strategic objectives.
The Thomas Kilmann model identifies two dimensions when choosing a course of action in a con-flict situation, these are assertiveness and cooperativeness. Assertiveness is the degree to which you try to satisfy your own needs. Cooperativeness is the degree to which you try to satisfy the other person's concerns.

ISO 9001:2015 specifies requirements for a quality management system.
ISO 14001:2015 specifies the requirements for an environmental management system that an or-ganization can use to enhance its environmental performance. ISO 14001:2015 is intended for use by an organization seeking to manage its environmental responsibilities in a systematic manner that contributes to the environmental pillar of sustainability.
ISO 22716:2007 gives guidelines for the production, control, storage and shipment of cosmetic products.
These guidelines cover the quality aspects of the product, but as a whole do not cover safety aspects for the personnel engaged in the plant, nor do they cover aspects of protection of the environment.
ISO 13485:2016 specifies requirements for a quality management system where an organization needs to demonstrate its ability to provide medical devices and related services that consistently meet customer and applicable regulatory requirements.