A general model for constructing minimal length checking sequences is propo
sed. The model is based on the characteristics of checking sequences and se
ts of state identification and verification sequences. Some existing method
s are shown to be special cases of the proposed model. The minimality of th
e resulting checking sequences is discussed and heuristic algorithms for th
e construction of minimal length checking sequences given. (C) 1999 Elsevie
r Science B.V. All rights reserved.