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In this design, each model input is assumed to vary across <math>p</math> selected levels in the space of the input factors. The region of experimentation <math>\Omega</math> is thus a <math>k</math>-dimensional <math>p</math>-level grid.
[[File:EE_trajectory.jpg|thumb | right |
Each trajectory is composed of <math>(k+1)</math> points since input factors move one by one of a step <math> \Delta </math> in <math>\{1/(p-1), ... , 1-1/(p-1)\}</math> while all the others remain fixed. Figure 1 shows an example of trajectory in three dimensions.
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An efficient technical scheme to construct the trajectories used in the EE method is presented in the original paper while an improvement strategy aimed at better exploring the input space is proposed by Campolongo et al..
==References==
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