This study argues that mutual trustworthiness, i.e., ability, integrity, and benevolence, between employee representatives and management is an important antecedent for the adoption of high performance work systems (HPWS). Using dyadic survey data from 1,353 labour representatives and managers from union and non-union establishments in Korea, this study tested three hypotheses. It was found that mutual ability trustworthiness (MAT), mutual benevolence trustworthiness (MBT), and mutual integrity trustworthiness (MIT) between labour representatives and management had a positive relationship with the adoption of HPWS. These results add to the existing HPWS literature by adding mutual trustworthiness to the list of HPWS antecedents. The study implies that in Korean employment relations, there is a need to develop mutual trustworthiness to improve the adoption of HPWS and that this can be achieved by pursuing a differentiation strategy. KEYWORDS: mutual trustworthiness, cooperative employment relations, high performance work systems, Korea. In this study, we examine the role of mutual trustworthiness between labour representatives and management and its relationship with the adoption of High Performance Work Systems (HPWS) in the Korean employment relations context. We argue that trustworthiness is a feature of the parties to the exchange, as opposed to trust, which explains the nature of exchange relationships. We follow existing literature on trustworthiness and agree that it is composed of three variables, i.e., ability, integrity, and benevolence. We test the effects of these three variables as important antecedents for the adoption of HPWS at the workplace level. Using the National Establishment Survey 2009 conducted by Statistics Korea as a sample frame, we survey a representative sample of Korean establishments. These data consist of 1,353 paired responses from labour representatives and managers. Our results show that labour-management mutual ability trustworthiness (MAT) has a positive and significant relationship with the adoption of high performance work systems (Hypothesis 1); mutual benevolence trustworthiness (MBT) has a positive and significant relationship with the adoption of high performance work systems (Hypothesis 2); and mutual integrity trustworthiness (MIT) has a positive and significant relationship with the adoption of high performance work systems (Hypothesis 3). These results show that mutual trustworthiness in Korean employment relations is an important antecedent for the adoption of HPWS and can enable Korean industry to improve its position in the global economy. In the final analysis, it is implied that employment relations actors pursuing cooperative employment practices should ensure the development of a virtuous cycle of mutual trustworthiness. KEYWORDS: mutual trustworthiness, cooperative employment relations, high performance work systems, Korea. Dans cette etude, nous examinons le role de la loyaute mutuelle entre les representants syndicaux et la direction ainsi que sa relation avec l'adoption de systemes de travail a haute performance dans le contexte des relations de travail en Coree. Nous soutenons que la loyaute est une caracteristique des parties a l'echange, par opposition a la confiance qui explique la nature des relations d'echange. Nous suivons la litterature existante sur la loyaute et convenons qu'elle est composee de trois variables, a savoir, la capacite, l'integrite et la bienveillance. Nous testons les effets de ces trois variables comme les antecedents importants pour l'adoption de pratiques mobilisatrices au niveau du lieu de travail. Utilisation de l'Enquete nationale 2009 menee par Statistique Coree comme base de sondage, nous passons en revue un echantillon representatif d'etablissements coreens. Ces donnees se composent de 1353 reponses appariees de representants syndicaux et la direction. Nos resultats montrent que la capacite de loyaute mutuelle entre les representants syndicaux et la direction a une relation positive et significative avec l'adoption des systemes de travail a haute performance (Hypothese 1); la bienveillance de la loyaute mutuelle a une relation positive et significative avec l'adoption des systemes de travail a haute performance (hypothese 2); t l'integrite de la loyaute mutuelle a une relation positive et significative avec l'adoption des systemes de travail a haute performance (Hypothese 3). Ces resultats montrent que la loyaute mutuelle dans les relations d'emploi coreennes est un antecedent important pour l'adoption de pratiques mobilisatrices et peut permettre a l'industrie coreenne d'ameliorer sa position dans l'economie mondiale. En derniere analyse, cela implique que les acteurs des relations d'emploi qui adoptent des pratiques cooperatives de travail devraient assurer le developpement d'un cercle vertueux de la loyaute mutuelle. MOTS-CLES: loyaute mutuelle, contexte professionnel cooperatif, systemes de travail a haute performance, Coree. Este estudio examina el rol de la fiabilidad mutua entre los representantes de los trabajadores y de la direccion y su relacion con la adopcion de sistemas de trabajo a alto rendimiento (STAR) en el contexto Coreano de relaciones de empleo. Se argumenta que la fiabilidad es una caracteristica de las partes en el intercambio, opuesta a la confianza, que explica la naturaleza de las relaciones de intercambio. Segun la literatura existente, la fiabilidad se compone de tres variables, la capacidad, la integridad y la benevolencia. Se evaluan los efectos de estas tres variables como antecedentes importantes para la adopcion de STAR a nivel del lugar de trabajo. La Encuesta nacional de establecimientos 2009 realizada por Estadisticas Corea sirvio de base para el diseno de una encuesta con una muestra representativa de establecimientos Coreanos. Se obtuvo asi 1 353 respuestas apareadas de representantes laborales y directivos. Nuestros resultados muestran que la capacidad de fiabilidad mutua (CFM) entre trabajadores y directivos tiene una relacion positiva y significativa con la adopcion de sistemas de trabajo a alto rendimiento (STAR) (hipotesis 1); la benevolencia de la fiabilidad mutua (BFM) tiene una relacion positiva y significativa con la adopcion de STAR (hipotesis 2), y la integridad de la fiabilidad mutua (IFM) tiene un relacion positiva y significativa con la adopcion de STAR (hipotesis 3). Estos resultados muestran que la fiabilidad mutua en las relaciones de empleo en Corea es un antecedente importante para la adopcion de STAR y puede habilitar la industria Coreana a mejorar su posicion en la economia global. Por ultimo, se deduce del analisis que los actores de las relaciones de empleo que promueven practicas cooperativas deberian asegurarse del desarrollo de un ciclo virtuoso de fiabilidad mutua. PALABRAS CLAVES : fiabilidad mutua, relaciones laborales cooperativas, sistemas de trabajo a alto rendimiento, Corea., Yoon-Ho Kim, Dong-One Kim and Mohammad A. Ali Introduction This study argues that mutual trustworthiness is an important antecedent for the adoption of high performance work systems (HPWS). Recently, trust [...]