In this context, "impact assessment and associated aspects for different activities and actions" are presented next to "impacts from and guidelines on different activities and actions." Each Key Citations listing is a selection of readily-available publications that typify the particular subfield of impact assessment. Primarily, the listings are to provide a source of readily accessible information for people wanting to learn more about that subfield. However, they might also be regarded as representing the core literature of each field. The Key Citations series is under the general editorship of Dr Thomas Fischer (University of Liverpool, UK). The guidelines governing the Key Citations can be requested from him or from IAIA Headquarters staff.