RS = Q * d
… Where Q, an estimated level of consequences, is the sum of three parameters (class of the phenomenon, type of discovery and distance) and D represents the estimated credibility of a claimed discovery. The value of Q is easily quantified according to the class of the reported phenomenon, the type of discovery and the estimated distance at the source of the detected phenomenon. The value assigned to D is a little more subjective, and is likely to vary over time and between observers. It should be noted that the river Scale is a tool for dynamic analysis rather than static. Throughout the lifetime of any SETI event underway, as the survey is carried out and the researched verification measures, new information is constantly available, affecting our perceptions regarding the importance and credibility of Survey claimed. Therefore, it can be expected that the value of the river scale assigned to any SETI detection will change significantly (up or Down) over time.
River Stair Computer
Work in progress
The scale of the river continues to be a work in progress. The information presented on this WEB page is intended to be used by members of the IAA Standing Committee only for further development purposes of this research tool. Users should expect this page of the river scale, and the scale calculator of the riverbed, connected by the previous paragraph, to change from time to time, at the discretion of the IAA Permanent Study Group. The current version contained in this document, Revision 1.2, was officially accepted by the IAA Standing Committee in its 2003 meeting in Bremen, pending future revisions at subsequent meetings, and was submitted to the International Astro Academy for formal adoption. Source)