A Checklist providing an outline of the main legal arguments for a plaintiff's counsel to consider when preparing a response to the employer's motion for summary judgment in a single plaintiff employment discrimination case alleging retaliation under Title VII of the Civil Rights Act of 1964 (Title VII), the Americans with Disabilities Act (ADA), the Age Discrimination in Employment Act (ADEA), or the Genetic Information Nondiscrimination Act (GINA). It addresses the McDonnell Douglas burden-shifting analysis, the plaintiff's burden to demonstrate protected activity, an adverse employment action, and causation, and tips for opposing the employer's arguments. This Checklist addresses federal law but is useful for cases that also include state law claims.