| Title | Organization | Date |
| co-chair | AT&T/JPL/HP Software Reliability Technical Exchange Program | 1988-1990 |
| coordinator | NASA Space Station Freedom Technical Conference | 1988 |
| member | AIAA Software Reliability Working Group Blue Ribbon Panel | 1989-1993 |
| vice-chair | IEEE Technical Subcommittee on Software Reliability Engineering | 1990-date |
| member | Executive Committee of IEEE/TC on Software Engineering | 1990-1993 |
| steering comm. | 1st IEEE International Symposium on Software Reliability Engineering | 1990 |
| chair | IEEE/Computer Society Cedar Rapids/Iowa City Chapter | 1991-1992 |
| PC chair | 7th IEEE International Symposium on Software Reliability Engineering | 1996 |
| PC member | IEEE Symposium on Reliable Distributed Systems (SRDS'96, SRDS'02) | 1996,2002 |
| PC member | IEEE High-Assurance Systems Engineering Workshop (HASE'96) | 1996 |
| PC member | IEEE International Conference on Engineering Complex Computer Systems | 1997 |
| SC&PC member | IEEE Workshop on Application-Specific Software Engineering and Technology | 1998 |
| PC member | IEEE 28th International Symposium on Fault Tolerant Computing (FTCS'28) | 1998 |
| PC member | 24th and 25th Euromicro Conference | 1998,1999 |
| PC member | Asian Pacific Software Engineering Conference (APSEC'98, '99, '00, '01, '02) | 1998-2002 |
| PC member | Computer Systems and Applications Conference (COMPSAC'99, '00) | 1999-2000 |
| PC Co-Chair | Pacific Rim Dependable Computing Symposium (PRDC'99) | 1999 |
| PC member | Workshop on Mobile Data Access | 1999 |
| PC member | Application-Specific Software Engineering Techniques (ASSET'98, '00) | 1998,2000 |
| PC member | International Conference on Probabilistic Safety Assessment and Management (PSAM) | 2000,2001 |
| PC member | IEEE ISSRE Program Committee | 1991-2002 |
| PC member | Pacific Rim Dependable Computing Symposium (PRDC'2000, '02) | 2000, 2002 |
| PC member, steering comm. | Asia-Pacific Software Engineering Conference (APSEC) | 1999-2003 |
| PC member | International Conference on Dependable Systems and Networks (ICDSN)'00,'01,'02 | 2000-2002 |
| PC member | Mobile Data Management (MDM'2001) | 2001 |
| PC Co-Chair | The 10th World Wide Web Conference (WWW10) | 2001 |
| General Chair | The 12th International Symposium on Software Reliability Engineering (ISSRE'2001) received Certificate of Appreciation from IEEE Computer Society for outstanding service | 2001 |
| PC member | The 2002 World Wide Web Conference (WWW2002) | 2002 |
| PC member | International Symposium on Empirical Software Engineering (ISESE2002) | 2002 |
| PC member | The 2003 IEEE/WIC International Conference on Web Intelligence (WI 2003) | 2003 |
| PC member | The 4th International Conference on Web Information System Engineering (WISE 2003) | 2003 |
| PC member | IASTED International Conference on Software Engineering (SE 2004) | 2004 |
| PC member | The 7th Asia Pacific Web Conference (APWeb' 2005) | 2005 |
| General co-chair | Pacific Rim Dependable Computing Symposium (PRDC 2005) | 2005 |
| PC member | International Conference on Digital Archive Technologies (ICDAT'2005) | 2005 |
| PC co-chair | International Symposium on Reliable Distributed Systems (SRDS'2005) | 2005 |
| PC co-chair | International Conference on e-Business Engineering (ICEBE'2007) | 2007 |
| PC member | The 18th International Symposium on Software Reliability Engineering (ISSRE'2007) | 2007 |
| PC member | The 26th IEEE International Symposium on Reliable Distributed Systems | 2007 |
| PC member | The 13th IEEE Pacific Rim International Symposium on Dependable Computing (PRDC'07) | 2007 |
| PC member | The 14th Asia-Pacific Software Engineering Conference (APSEC) | 2007 |
| PC member | The 19th International Symposium on Software Reliability Engineering (ISSRE'2008) | 2008 |
| PC member | International Symposium on Reliable Distributed Systems (SRDS'2008) | 2008 |
| PC member | The 14th IEEE Pacific Rim International Symposium on Dependable Computing (PRDC'08) | 2008 |
| PC member | The 15th Asia-Pacific Software Engineering Conference (APSEC) | 2008 |
| PC member | The 5th International Service Availability Symposium (ISAS'2008) | 2008 |
| PC member | The 39th Annual IEEE/IFIP International Conference on Dependable Systems and Networks (DSN'2009) | 2009 |
| PC member | The 20th International Symposium on Software Reliability Engineering (ISSRE'2009) | 2009 |
| PC member | Proactive Failure Avoidance, Recovery and Maintenance (PFARM) | 2009 |
| PC member | The 21st International Conference on Software Engineering and Knowledge Engineering (SEKE'2009) | 2009 |
| PC member | Third ACM International Conference on Web Search and Data Mining (WSDM'2010) | 2010 |
| PC member | 19th International World Wide Web Conference (WWW'2010) | 2010 |
| PC member | Fourth ACM International Conference on Web Search and Data Mining (WSDM'2011) | 2011 |
| General Chair | The 41st Annual IEEE/IFIP International Conference on Dependable Systems and Networks (DSN’2011) | 2011 |
| Steering Committee Member | IEEE International Workshop on Internet-based virtual computing environment | 2011 |
| PC member | IEEE International Symposium On Object/Component/Service-Oriented Real-Time Distributed Computing | 2011 |
| Advisory Committee Member | IEEE International Conference on Cloud Computing 2011 | 2011 |
| Advisory Committee Member | IEEE International Conference on Web Services 2011 | 2011 |
| Advisory Committee Member | IEEE World Congress on Services 2011 | 2011 |
| Advisory Committee Member | IEEE International Conference on Service Computing 2011 | 2011 |
