Understanding your realistic worth is crucial. List everything you brought to the company – your own contacts, overtime, further qualifications, sales increases, maybe special degrees. Bring the original job offer to compare the effort you bring with what was initially requested. If you have new big projects on the line, mention them. Will you save costs in the next months? Talk about it. The general principle is to always discuss your achievements, your work and your commitment – things you can quantify. Don’t compare yourself to colleagues, don’t pressure your boss, and don’t pout.