In addition to developing more or less the same behavioral repertoire as their group, young foragers could also become more selective than older foragers, resulting in their rejection of the lower quality resources in the group repertoire . This is possible because young foragers experience a different ‘frame of reference’ with respect to their repertoire development than older ones have, where young foragers can select a subset within the repertoire of their group. In addition, young foragers could add resource types to their repertoire that are novel for the group since initially they do not have a familiarity bias. However, these resource types will only be selected if they are considered to be sufficiently rewarding relative to others in the repertoire. Hence this process tends to lead to the inclusion of relatively high quality novel resource types. In sum, both the rejection of low quality resource types and the inclusion of high quality ones, can generate a process whereby the repertoire quality in the group improves over generations beyond the lifespan of a single forager. This can be seen as a cumulative cultural process . Note that this process will mainly occur in the early stages when a group explores a new environment. After a while the cumulative process levels off, and new generations no longer become more selective than previous generations.