TL;DR: This work observed the work of cleaners on wards and in offices in an acute-care hospital, using several indicators of workload to identify and characterize typical work situations and did not discover any compelling reason to divide cleaning into 'light' and 'heavy' work.
TL;DR: The plenary lectures from the 16th World Congress on Ergonomics, Maastricht, July 10-14, 2006, have been documented in this special issue and show new trends and developments in the central subject.