6.60. In developing scenarios for human intrusion, two contrasting approaches can be adopted. One is that a few generic scenarios are developed for all or most situations. An alternative approach is that scenarios are developed on a site specific basis. There are advantages and disadvantages to both approaches and the choice of approach (generic or site specific) should be made in accordance with the purpose of the particular assessment. Even if it is decided that generic scenarios are to be developed, certain site specific features (such as the depth and design of the facility, its geological environment and the characteristics of the waste) should be taken into account.