Marxism
This doesn’t make any sense. Perhaps you mean the highest stage of Communism, which Marx described as ‘to each according to their needs’.
Derek Bryant has written: 'The revision of Marxism and the development of sociology'
Development of conflict involves 5 consecutive stages. These are latent stage, perceived stage, felt stage, manifest stage and aftermath stage.
Maoism is a development of Marxism-Leninism that emphasizes the role of peasants in revolution, the concept of protracted people's war, and continuous revolution under socialism. It also emphasizes mass mobilization and ideological purity. These elements distinguish Maoism from classical Marxism and Leninism.
First Stage: The first two weeks after conception are known as the Germinal stage. Second Stage: The next six weeks of development are known as the Embryonic stage. Third Stage: The remainder of prenatal development is known as the Fetal stage.
A stage of development might also be called a phase of development.
The Cumulus Stage
This question is incomplete in the sense that it does not clarify what the development tasks or stage is being asked about. In order to list the development tasks that happen during this stage, the stage, and of what, would need to be known.
The cumulus/development stage
Puberty is a stage of physical development during adolescence.
Adolescence as a separate stage of development was not considered until the twentieth century.