It has become increasingly apparent that different chimpanzee populations behave differently. Most behaviours and vocalizations are observed across all or most populations. Some behaviours, however, are specific to few populations and different populations behave disparately when solving the same problems. Instead of speaking about the ‘typical’ behaviours, one can probably speak better of a range of chimpanzee behaviours. Between populations, behaviours can range widely. For good comparability and to avoid biases, observers either need to unilaterally use the same protocol or it needs to be apparent how and which data have been collected. Here, we clarify the protocol under which long-term data are collected by the Taï Chimpanzee Project. Despite regular changes to improve and update long-term data collection, our core data collection has remained unchanged, allowing use of the whole data set in analyses. With this chapter, not only can we interpret results generated from the Taï database with more accuracy, but also provide more accessibility for comparisons than currently available. One of the outcomes of this chapter will be making comparisons across study populations easier.