The issue focused on the problem of making real-time computer systems that can think in the world. e-mail: R.K. Gaviland, L.G. Deresiewicz, A.G. Stakur, A.H. Thunen, A.H. Thunen, A.H. Thunen, C.H. Seifert, A.H. Thunen, A.H. Thunen, A.H. Thun