In this article we have classified computational creativity research activities into three generations. Although the respective system developers were not necessarily targeting their research for computational creativity, we consider their works as contribution to this emerging field. Possibly, the first recognition of the implication of intelligent systems toward the creativity came with an AAAI Spring Symposium on AI and Creativity (Dartnall and Kim, 1993). We have here tried to chart the progress of the field by describing some sample projects. Our hope is that this article will provide some direction to the interested researchers and help creating a vision for the community.