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{
Before development:
r
1
7!
[
a 7! ii
a
;t 7! ii
t
]
r
2
7!
[
a
7! ii
]
{
After development:
2
3
r
0
1
a 7! ii
0
a
;t 7! ii
t
]
7!
[
4
5
r
0
2
7!
[
a
7! ii
]
r
3
7!
[
a
7! ii
]
An interpretation of the above could be that in this development three resources
are being changed (
r
1
has a time attribute. Be-
fore development its value satised some equity indicator interval
r
1
;r
2
)orcreated(
r
3
). Resource
ii
t
, afterwards
ii
t
. Etcetera. What we mean by `satisfy' is again open for wide inter-
is satises
pretation.
This example serves to show that the preparer, the analyzer and planner have
very wide degree of freedom in formulating functions over almost any combina-
tion of resources and, within these, of interpretation.
5 Requirements Capture: A \DSS for SD"
By a `DSS for SD' we mean a decision support system for sustainable develop-
ment. Section 4 described what we mean by sustainable development.
In this section we will analyze the actions needed in preparing for, making
plans and analyzing plans for sustainable development, and, in particular, iden-
tify the computer and communications support of these actions. That is: we
capture, in this section, the requirements for a DSS for SD.
In doing so we shall repeatedly refer to subsections of section 4.
5.1
Resource Representation
In section 4 we \dealt" with \real" resources. In real reality we \deal" with
representations of resources. That is: we assume that every resource (r:R) that
we wish to handle can be \formally" represented, ie. modelled by some rr:RR,
the class of resource representations. We therefore redene the functions over R
to also apply to RR:
type
RR
value
obs RRC: RR
!
C
obs RRAs: RR
!
A
-set
A
!
obs RRAV: RR
VAL
I
is in Rng: RR
A
!
Fuzzy
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