The current approach to the design of fill, as a structural component in a mining system, is based on traditional usage, previous experience, empirical rules and preconceived ideas. This approach does not permit the relative economics of the various possibilities to be evaluated, retards introduction of new materials or processes, and results in fragmented fill research effort._x000D_
A rational approach to the design of fill is proposed as a means of overcoming these disadvantages._x000D_
This is based on five components: (a) statement of functions of fill, (b) definition of modes of fill response, (c) criteria of satisfactory performance, (d) analysis of fill response, (e) specification of required fill properties and methods of obtaining them._x000D_
An assessment of each component indicates that the adoption of this rational design approach will require research effort in categorising modes of fill response and in defining criteria of satisfactory performance.