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Four approaches to interface design are considered: technology centered, user centered, control centered, and use centered (ecological). Each perspective provides unique insights into pieces of the interface design problem. However, it is argued that the ecological or use centered approach provides a more comprehensive framework within which the other three perspectives can play important supporting roles. This approach goes beyond issues of information requirements to address meaning as an emergent property of a dynamic work ecology.

The response matrix method has successfully been applied to problems to solve the multigroup diffusion equation for one-dimensional multiregion reactors. The method consists of the calculation of response matrices of spatial regions, which is reduced to a boundary value problem for a bare homogeneous region and can be performed analyti cally, and of the criticality calculation by means of response matrices, which can be performed by simple algebra involving matrices even for reactors consisting of many spatial regions, since the order of matrices involved is equal to the number of energy groups independently of the number of spatial regions. By a numerical calculation it has been confirmed that the method gives us the accurate solution and that the execution time of the machine is appreciably less than that by the finite difference method for few-group calculations. Criticality calculations by means of an electronic analog computer were also performed. It was shown that the analog calculation gives us the multiplication factor of two-region reactors with an error less than 0.1% by simple procedures.

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