1. PhD Student, Dept. of Civ. and Constr. Engrg., UMIST, Sackville St., Manchester M60 1QD, U.K.; formerly, Lect., Dept. of Civ. Engrg., Univ. of Andalas, Padang 251263, Indonesia.
2. Sr. Lect., Dept. of Civ. and Constr. Engrg., UMIST, Sackville St., Manchester M60 1QD, U.K.
3. HM Inspector, U.K. Health and Safety Executive-Constr. Nat. Interest Group, London and South East Region, Southwark Ofc., St Dunstan's House, 201-211 Borough High St., London SE1 1GZ, U.K.