%X The science of planning seems inextricably linked with ethics, because the planning process exists to serve the public interest. Subsequently this implies that a planning or engineering firm should act in a social responsible way. Business ethics as field of study contains those concerns about the actions of organizations and a result of this public concern is Corporate Social Responsibility (CSR). Dutch planning engineering companies have introduced ethical codes, corporate values and CSR. Witteveen+Bos, a Dutch engineering consultancy and the case study in this research, also embraced CSR. A study of the extent to which those corporate norms and values are leading in the daily decision making process and embedded into the organization, is reported here. This internalization process is important to understand when a company wants to act in line with their vision in the context of business ethics. %A L. Oehlers %L theses_frw727 %D 2012 %T Planning and Ethics 'the moral behind an engineering consultancy'