The organizational events of the last 10 years - outsourcing, downsizing, reengineering, acquisitions, joint ventures, etc - are challenging the traditional HR and established executive practices since the decade of 1970 (John P. Morgan, 2001). As a consequence of these changes, an innovative approach was developed in the middle of 90´s, the HPWS (High Performance Work Systems): a group of high-performance practices with the objective of select, develop and retain the work-force with superior skills, knowledge and abilities, motivating them to the use of this know-how in the workplace. Although, verifying that these implementations could present different results, impacted by the industry, the organizational culture and strategy, etc, was reasonable to accept the theory about Psychological Contracts at Work as a necessary instrument to a deeply comprehension of the subject. To understand the basis of a Psychological Contract helps the comprehension of the implicit agreements built between the employer and the employee, what can help the study of the influence of these agreements in a traditional HPWS implementation. The reason of the choice of a consulting operation, as the environment of the survey, is simple: consulting operations are complex environments with a strong organizational culture where the utilization of HPWS is a usual aspect, resuming all necessary variables to the observation of the phenomenon. So, the primary objective of this dissertation is to verify if this evaluated group perceives the implementation of each HPWS in a different way. This verification is, methodologically speaking, a fundamental step to the search of possible relationships between: how important is each HPWS for these consultants, what is the predominant Psychological Contract in place and the typology of organizational culture, all secondary objectives of this dissertation but, from the point of view of the author, as important as the primary one.