Evaluating multi-stakeholder perceptions of project impacts: a participatory value-based multi-criteria approach

This paper describes a participatory multi-stakeholder impact assessment approach based on the concept of a value tree (VT), generated using the value focused thinking method (VFT) developed by Keeney (1992). This approach allows stakeholders to specify impact parameters to be evaluated, which in the context of the VT, are organized as goals, objectives and alternatives. The approach is implemented in two phases: Phase I is designed to formulate stakeholders' collective VT following VFT concepts and the cognitive mapping method, and Phase II is a participatory valuation approach based on the VT formed in Phase I. The Wand the VFT concepts are adopted as tools to capture different stakeholders' values, goals and perceptions. The resulting VT is structured as a hierarchy between goals and objectives, and a network consisting of relationships, linkages and cross-impacts of the different alternatives and objectives. The hierarchy and network structure enables stakeholders to decompose complex assessment problem into 'smaller' units, which makes for easier and clearer assessment context, without ignoring linkages of the units or assessment elements. The second phase allows stakeholders to express their preferences with respect to each assessment element, through a voting system that ultimately leads to measures of importance or relative weights associated with each element. A modified Analytic Hierarchy Process (called Analytic Network Process) was used to distill relative weights from the voting results. Results obtained from a case study in a Zimbabwean community forest show that the proposed approach is easy to implement and can address questions about whether a project can lead to a positive change in attitudes, and whether the changes actually lead to a propensity to adopt alternatives that the project supports (e.g. conservation-oriented alternatives).