Decision points
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Decision points
IF amount>1000 THEN
assess by supervisor
IF not in stock THEN
order
IF number of books > 8 OR sum ≥ 100 THEN extra
discount
A decision point is a a combination of one or more conditions
that define the conditions for the various possibilities in the
subsequent system behaviour.
IF number of books > 8 THEN extra
discount
IF number of books > 8 THEN extra
discount
Test situations
Number of books
Result
Test situations 1 2
Number of books >8 ≤8
Result true false
IF number of books > 8 THEN extra
discount
Singular conditions lead to 2 test situations
Test situations 1 2
Number of books >8 ≤8
Result 1 0
IF number of books > 8 THEN extra
discount
In Boolean algebra a “1” is used to represent “true”
Test situations 1 2
Number of books >8 ≤8
Result 1 0
IF number of books > 8 THEN extra
discount
In Boolean algebra a “0” is used to represent “false”
Decision points may consist of a combination of
conditions
IF number of books > 8
ORsum ≥ 100 THEN extra
discount
IF number of books > 8THEN extra
discount
A B
IF number of books > 8 OR sum ≥ 100 THEN extra discount
IF number of books > 8 OR sum ≥ 100 THEN extra discount
Abbreviated notation
A OR B
IF number of books > 8 AND sum ≥ 100 THEN extra discount
IF number of books > 8 OR sum ≥ 100 THEN extra discount
Abbreviated notation
A OR B
Abbreviated notation
A AND B
Complete
decision table
A B
1 1
1 0
0 1
0 0
Based on two conditions we get these possible
combinations
A B
1 1
1 0
0 1
0 0
The end result depends on the operators AND and OR
Truth table
A B A OR B
1 1 1
1 0 1
0 1 1
0 0 0With the operator OR the end
result is ONLY false when both conditions are false
This table shows the outcome of all situations of a full
decision tale. Such a table is called a truth table.
Truth table
A B A AND B
1 1 1
1 0 0
0 1 0
0 0 0
Truth table
A B A OR B
1 1 1
1 0 1
0 1 1
0 0 0
With the operator AND the end result is ONLY true when
both conditions are false
Truth table
A B C (A AND B) OR C
1 1 1 1
1 1 0 1
1 0 1 1
1 0 0 0
0 1 1 1
0 1 0 0
0 0 1 1
0 0 0 0
A combined decisionthere may be different operators. When there are no brackets
AND proceeds OR
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