Piece rate - when payment is based on the number of items (pieces) produced by an employee
Commission - when payment is based on the number of units sold
Bonus - an additional, lump sum, one off payment to an employee for meeting individual, team or company targets
Profit share - when a proportion of employee pay varies with the profits of the company
Performance related pay (PRP) is when employees receive a bonus based on the performance of the employee measured against a pre agreed range of criteria