The evidence needed to prove a discrimination claim varies depending on the type of discrimination alleged.
Disparate treatment covers intentional discrimination.
An employer engages in disparate treatment discrimination if he or she intentionally discriminates against you based on your membership in a protected class. This means that, among other things, an employer cannot decide to fire you because you are Asian, or refuse to promote you because your family is from Holland, or pay you a lower wage because you are a woman. You can prove discrimination either directly or circumstantially. Direct evidence of discrimination is the best kind of evidence, but it is very difficult to get. In order to prove discrimination, you must have actual evidence that your employer discriminated against you because of your race, color, national origin, religion, etc.