6.79. The planning and development of disposal facilities involves making decisions of various kinds. Examples are decisions about the site of the facility or decisions about the facility design. In the case of existing facilities, new information (e.g. information obtained through a monitoring programme) may raise concern regarding the ability of the facility to continue to perform safely. In such situations, decisions may be necessary as to whether to retrieve some or all of the waste or to upgrade the facility. Decision making in such cases necessitates comparison of different management options and identification of the option that complies with all of the applicable regulatory requirements and provides an optimal level of protection, with factors such as costs and other detrimental factors taken into account.