MLA Formatting and Style online guide can be referenced here.
Some annotations are merely descriptive, summarizing the authors' qualifications, research methods, and arguments. Your professor might also ask you to identify the authors' theoretical frameworks.
Many annotations evaluate the quality of scholarship in a book or article. You might want to consider the logic of authors' arguments, and the quality of their evidence. Your findings can be positive, negative, or mixed.
Your professor might also want you to explain why the source is relevant to your assignment.
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Battle, Ken. “Child Poverty: The Evolution and Impact of Child Benefits.” A Question of Commitment: Children's Rights in Canada. Ed. Katherine Covell and R.Brian Howe. Waterloo, ON: Wilfrid Laurier University Press. 2007. 21-44.
Ken Battle draws on a close study of government documents, as well as his own research as an extensively-published policy analyst, to explain Canadian child benefit programs. He outlines some fundamental assumptions supporting the belief that all society members should contribute to the upbringing of children. His comparison of child poverty rates in a number of countries is a useful wake-up to anyone assuming Canadian society is doing a good job of protecting children. Battle pays particular attention to the National Child Benefit (NCB), arguing that it did not deserve to be criticized by politicians and journalists. He outlines the NCB’s development, costs, and benefits, and laments that the Conservative government scaled it back in favour of the inferior Universal Child Care Benefit (UCCB). However, he relies too heavily on his own work; he is the sole or primary author of almost half the sources in his bibliography. He could make this work stronger by drawing from others' perspectives and analyses. However, Battle does offer a valuable source for this essay, because the chapter provides a concise overview of government-funded assistance currently available to parents. This offers context for analyzing the scope and financial reality of child poverty in Canada.