Human development: seeks to understand how and why people change over time, growth over the lifespan is multidirectional, multi contextual, multicultural, multidisciplinary, and plastic. Genes that you have (nature: your environment, development over time, multidirectional, critical period: must, sensitive: ideal time. Meso: child has to be at least in one. Exo: neighbourhood - indirectly effects the child (ex. government) Life-span perspective: takes into account all the phases of life, leads to the understanding of human development over the five terms (multidirectional, multicultural, multidirectional, multi contextual and plastic) Canada: multicultural: diversity, three founding peoples, aboriginals: first nations, inuit, metis, english, french, immigration: multiculturalism act, recognize we are different but the same. Culture: acculturation: cultural and psychological changes that individuals face as they come into contact with a new culture, canada: 21% immigrant population, trump effect, culture change. Certain periods of life are sensitive periods affected by events or people: 3.