(1) Evidence, although admissible, may not be very persuasive relevant to other evidence. On the other hand, that same evidence might not be very "weighty" by itself but may corroborate other evidence on a particular point and make the evidence on that point highly persuasive.
(2) It is not necessary to separately assign value to each item of evidence, but rather such evidence must be considered in the context of all evidence received.
(3) Caution must be exercised in both the decision to admit hearsay and as to determining the weight accorded to such evidence. There can be great variation among different hearsay evidence. For example, a medical conclusion found in a well-known medical text is likely to be more reliable than a second or third-hand version of a given fact.