DECISION TREE AND DECISION TABLE

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DECISION TREE AND DECISION TABLE
Systems investigation is part of information systems development. In it we define and record facts.
Business involves processes and certain processes involve decisions. Where a decision is straight
forward and with only a few possible outcomes, there is no difficulty in specifying what is involved.
For this, decision trees or tables can be drawn.
Consider the following situation.
A stock control procedure follows the rules outlined below.
1. If the stock in hand is at or above the excess level, any batch on order is cancelled.
2. If the stock in hand is greater than the re-order level but below excess level, any batch on
order is delayed.
3. If the stock in hand has dropped to or below the re-order level, an order is placed unless a
batch is already on order, in which case this is chased if overdue.
4. When the stock in hand has dropped to the emergency level, any batch on order is chased,
otherwise a rush order is placed.
Decision Tree
To draw a decision tree or table, ensure all the rules or conditions are expresses in such a way that
we could answer with yes or no” only. Study the rules above as you compare with the analysis
below with the need to translate them so as to be amenable to “yes” or “no” answer. What is in red
remain.
Rule 1 is ok for that matter. It can be expressed as: Is stock >= excess? (This can be answered with