This paper addresses the difficulties encountered when trying to obtain documentation on linguistic phenomena related to the structure of information. In particular, we will refer to field research to collect data that informs us about the contribution of the particle ka in the Ecuadorian Andean Castilian and how it differs from its function in Kichwa. We will mainly deal with the weight of the ideology of standard Spanish and its erosive function on the features of this Andean variety. We will focus on how these ideologies affect linguistic fieldwork and expose the techniques we put into operation to overcome these difficulties. Finally, we will briefly summarize the results of the research. We will see that the particle ka in Ecuadorian Andean Castilian goes along with information that is not the main objective of the utterance, while in Castilian, a language that does not mark the structure of the information with morphemes, it becomes a mere marker of contrast.