We have pointed out elsewhere (see, for example, §6.6.3) that there may be alternative variance-covariance and expectation specifications for the same collection of elements, and these alternatives will be located in different belief and expectation stores. When we carry out an adjustment, we anticipate by default that all relevant variance-covariance specifications are in belief store number one, but this need not be the case. Indeed, for exchangeable adjustments this is often not the case.
As far as the expectation specifications are concerned, only the current default expectation store is ever referenced; the remainder are ignored. The default expectation store can be changed by using the e argument to the CONTROL: command.
Suppose that we gather all of the information sources 
into the base D, and suppose that the sample size is unity.
The information required by the adjustment is as follows:
and 
. These will have been specified
earlier, when the elements were defined using the ELEMENT:
command, and might since have been
modified by using the E: command.
. By default these variances are assumed to be present in belief
store number one. If they are elsewhere, this can be changed by using the
priorvar control as the adjustment assumes that the prior variance
matrix over B can be found in the belief store pointed to by this
priorvar control.
. By default these variances are assumed to be
present in belief store number one. If they are elsewhere, this can be
changed by using the infovar control as the adjustment assumes that
the prior variance matrix over D can be found in the belief store
pointed to by this infovar control.
. By default these covariances are assumed to be
present in belief store number one. If they are elsewhere, this can be
changed by using the betweenvar control as the adjustment assumes that
the prior covariance matrix between B and D can be found in the
belief store pointed to by this betweenvar control.