For the case of two levels (L=2), Plackett and Burman used the method found in 1933 by Raymond Paley for generating orthogonal matrices whose elements are all either 1 or -1 (Hadamard matrices).
Construction | construction | William Paley | construction worker | William S. Paley | American Institute of Steel Construction | Construction foreman | Grace Paley | Construction aggregate | Nina Paley | Henry Paley | Edward Graham Paley | Raymond Paley | PCL Construction | Japan Railway Construction, Transport and Technology Agency | Construction worker | construction aggregate | China Communications Construction | Albert Paley | Utah Construction Company | Turner Construction | Société de Construction des Batignolles | Set construction | Offshore construction | Natalia Pavlovna Paley | Hindustan Construction Company | Construction Specifications Institute | Construction Management Association of America | Construction bidding | Compagnie générale de construction et d'entretien du matériel de chemin de fer |