The ?PALPA? (Pyscholinguistic Assessment of Language Processing) has become a popular resource for clinician and researcher since its publication in 1992. It is timely, therefore, that Aphasiology should host this Special Issue devoted to the PALPA, which includes papers from workers who are involved with the current and the future editions of PALPA. Papers cover the research that has appeared over the past 10 years using the PALPA and a series of investigations on the utility of different component tests of the PALPA and an overview of the impact of the PALPA on research and clinical work. Clinicians, researchers and students working in language impairments following brain damage will find this collection relevant.