A Synthesis of Aggregation Methods for Multifacility Location Problems: Strategies for Containing Error

When solving a location problem using aggregated units to represent demand, it is well known that the process of aggregation introduces error. Research has focussed on individual components of error, with little work on identifying and controlling total error. We provide a focussed review of some of this literature and suggest a strategy for controlling total error. Consideration of alternative criteria for evaluating aggregation schemes shows that the method selected should be compatible with the objectives of the analyses in which it is used. Experiments are described that show that two different measures of error are related in a nonlinear way to the number of aggregate demand points (q), for any value of the number of facilities (p). We focus on the parameter q/p and show that it is critical for determining the expected severity of the error. Many practical implementations of location algorithms operate within the range of q/p where the rate of change of error with respect to q/p is highest.     

Including people with learning difficulties in cultural and heritage sites

This paper examines the processes involved in a participatory inclusive research project in Liverpool and Merseyside, UK. The project involved 25 people with learning difficulties – the Heritage Forum – visiting 13 cultural and heritage sites on more than 50 occasions across a 15‐month period. The research provides a much needed resource at a time when there is a lack of provision for, and research into, the intellectual accessibility of cultural and heritage sites in the UK and globally. This paper details the research approach taken by the Heritage Forum, providing a flexible protocol about ways of working with groups and individuals with learning difficulties. It also reports on the Heritage Forum’s general findings about the cultural and heritage sites, providing some initial guidance about how to best include this diverse population.