However, none of these variables is sufficient to clearly identify aid activities with an STI focus, which are cross-sectoral in nature. The CRS also includes description fields, in which the reporting entity can enter project summaries or descriptions of the main objectives of the activity. These fields are free text fields without much restrictions on structure, and can assist in the validation process of the data, e.g. to ensure accuracy of coding. These fields are also aimed to support studies where the topic of interest cannot be separately identified through other classificatory variables.