The format for an assignment depends largely on the type of assignment, the purpose of the assignment, and the instructor's preferences. Generally, however, assignments consist of several components:
Introduction: A brief summary of what the assignment entails, who it is for, and when it is due.
Guidelines: Detailed instructions on what the assignment requires (papers typically contain an outline of all required elements, as well as thorough discussion of the writing process).
Materials: Any outside research or other materials needed to complete the assignment.
Submission: Submission guidelines such as the form of written work to turn in (e.g., hard copy, online version, etc.).
Grading criteria: Explanation of the criteria used to assess the assignment.
It is important to note that different types of assignments have different formats - for example, essays, research papers, and lab reports. Therefore, it is important to consult your instructor or read the course syllabus for assignments for for specific details about the formatting requirements for your assignment.
For more detailed information about assignment formats, you can visit the Academic Writing Center's website here: http://writingcentre.usask.ca/assignment-writing-basics.html.