This chapter shows some of the practices of engineers use when they are confronted to completely new situations, when they enter into an emerging field where methods and paradigms are not yet stabilized. Following the engineers here would help to shed light on their practices when they are confronted to new fields and new interlocutors. This is the case for engineers and computer scientists who engage themselves with human and social sciences to imagine, design, develop and implement digital humanities (DH) with specific hardware, software and infrastructure.