AbstractA detailed description of an improved version of backtracking algorithms for finding t‐designs proposed by G. B. Khosrovshahi and the authors of this paper [J Combin Designs 10 (2002), 180–194] is presented. The algorithm is then used to determine all 5‐(14,6,3) designs admitting an automorphism of order 13, 11, or 7. It is concluded that a 5‐(14,6,3) design with an automorphism of prime order p exists if and only if p=2,3,7,13. © 2003 Wiley Periodicals, Inc. J Combin Designs 11: 240–248, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/jcd.10045