Group insurance plans are set up by an employer, union or other group with a view to providing insurance coverage to plan members in the event of death, accident, illness or disability. For employers, they are an attractive addition to benefits packages. The policyholder will negotiate the details of the contract with the insurer, which is generally compulsory for all employees or group members. Group members must have a relationship with the policyholder; for example, they must all be employed by the same company. There are small group plans for 2-50 people and large group plans for 50 or more. Group insurance premiums are generally guaranteed for a one-year period. Every year, the policyholder and insurer can negotiate changes to the plan.