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Gendex DOE Toolkit 8.0 FAQ

1. What is Gendex?

In the pre-computer age, the toolkit of designers of experiments included finite fields, group characters, etc. and various catalogs of experimental designs. Gendex is a toolkit for generating designs of experiments in the computer age. It has 16 modules, each of which is a by-product of one or two publications of Dr. Nam-Ky Nguyen in refereed journals.

2. Who should use Gendex?

Anyone belonging to one of the following group: (i) designers of experiments with a new philosophy of designing experiments, i.e. Design for the experiment, do not experiment for the design; (ii) designers of experiments in industrial settings where it is difficult to adjust the experimental materials to published plans; and (iii) designers of experiments in agricultural research stations in remote areas where it is easier to get access to a PC than to various catalogs and professional journals to find a usable plan.

3. What type of designs does Gendex generate?

The current version of Gendex can generate: α-designs, 2-level and mixed level fractional factorial designs, D- and G-optimal designs, blocked designs of all types, Box-Behnken type designs, cyclic designs, incomplete block designs, orthogonal and near-orthogonal arrays, resolvable designs, response surface designs including split-plot response surface designs, row-column designs, saturated and supersaturated designs, trend-free designs, etc.

4. Can Gendex handle design with large number of entries, say in the thousands?

Yes. The current version of Gendex can generate designs with up to 10,000 entries.

5. Has Gendex ever produced exciting designs?

Many times. Gendex has found a solution for the balanced incomplete block design for (v,k,r,b,λ)=(15,5,14,42,4) which is listed as unsolved in Professor Damaraju Raghavarao's well-known book Constructions and Combinatorial Problems in Design of Experiments (Dover Publications 1988). Gendex has found a solution for the the OA84(214 61 141) and a solution for the OA100(104 24). The orthogonal blocked Box-Behnken design for four factors is only available in three blocks. Gendex has found a solution for this design in two orthogonal rows (and columns).

6. Has Gendex design ever beaten standard designs such as Box-Behnken designs?

Sometimes. The solution Gendex has given for the 6-factor response surface design in 54 runs is better than the corresponding Box-Behnken design not only in terms of rotatability but also in terms of D- and G-optimality.

7. What did users say about Gendex?

Commenting on Gendex, Professor Walter T. Federer of Biometrics Unit, Cornell University wrote ...It should be available to every agricultural research department in the world...

8. Is Gendex only good for biometrician?

Although Gendex is geared towards food, agriculture and forestry sectors, there is no reason why it cannot be used in other sectors such as market research and semiconductors. The long list of nearly 100 Gendex licensees includes Institute of Food Research, Norwich Research Park (UK), Johnson & Johnson (USA), Kraft Foods (USA), NEC Semiconductors (UK), The Procter & Gamble Company (USA), Research Park Centre, University of Guelph (Canada).

9. Can Gendex run on my computer?

Gendex is written in Java 2, and as such can run on any computer platform with Java Runtime Environment installed.

10. How much does Gendex cost?

The evaluation copy of Gendex is free and downloadable at The perpetual personal/university license costs US$199. The university license entitles each staff/student to have a personal copy of the toolkit. For ordering information please email:

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