You should try to resolve a dispute outside litigation if possible. This may involve writing a demand letter to the potential defendant, telling them that you will sue if they do not address your grievance. Or it may involve pursuing a resolution through mediation, arbitration, or another less adversarial forum. However, if you have no real alternative, you may need to file a lawsuit. You should make sure that you have a strong case by reviewing the elements of your claim and determining whether you have evidence to prove each of them. Also, you should consider whether you will be able to collect a judgment if you win. If a defendant lacks the resources to pay, winning a lawsuit may not mean much in reality.