The present chapter addresses some issues on survey design and sample design for household budget surveys. The focus is on surveys in developing countries. Problems of measuring consumption and income are discussed in some detail in section B. Section C contains a discussion on some crucial sample design issues, for example, stratification, and sample allocation in space (geographical) and in t...

Virtual reality (VR) refers to an immersive, interactive, multi-sensory, viewer-centered, three-dimensional (3D) computer generated environment and the combination of technologies required to build such an environment (Cruz-Neira, 1993). Related to problems of engineering design and manufacturing, this new technology offers engineers the ability to work with computer models in a three-dimension...

This paper describes a technique for walking through, and climbing or descending steps and ladders in virtual reality. The idea is that human participants in the virtual reality (VR) carry out a whole body gesture similar to walking, by walking in place. A pattern analyser distinguishes between walking in place behaviour, and any other behaviour, and moves the participant through the environmen...