Arguing your grievance is like arguing a court case. You must have evidence to support your claims. Your evidence should be trustworthy, quantified, and positive. In your research of your grievance, you will have collected evidence in the form of documents, records, photographs, and eye-witness testimony.
Testimony is the most common evidence provided at grievance hearings.
Unfortunately, it is also the most difficult evidence to use successfully. Use concrete evidence to back up testimony Too often, grievances are argued entirely on the basis of testimony. You should always be on the lookout for ways to introduce concrete evidence, such as records, documents, and photographs. Even one piece of concrete evidence can make a big difference. For example, you might have some very good testimony about a notice posted on the bulletin board, but you have a stronger case if you have a copy of the notice to show.