The subject of employment law is the regulation of the relationship between employer and worker or, put in another way, the relationship between the user of labour and the supplier of labour. This regulation takes place at an individual level and at a collective level. At an individual level, the law takes the view that the contract of employment is like any other contract, namely a legally binding agreement that two equal parties have voluntarily entered into. At a collective level, workers and employers have banded together into trade unions and employers’ associations in order, partly, to give themselves greater bargaining power with each other.