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DECISION TABLE

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Decision Tables

Shows a logical structure, with all possiblecombinations of conditions and resulting actions

It is important to consider every possible outcome toensure that you have overlooked nothing

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Decision Tables

A decision table is a table with variousconditions and their correspondingactions. Decision table is a twodimensional matrix. It is divided into four

parts,condition stub

action stub

condition entryaction entry

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Condition stub shows the various possibleconditions.

Condition entry is used for specifyingwhich condition is being analyzed.

Action stub shows the various actionstaken against different conditions.

action entry is used to find out whichaction is taken corresponding to a

particular set of conditions.

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Developing Decision Tables

Every decision should be given a name andthe logic of the decision table is independentof the sequence in which condition rules arewritten but the action takes place in the order

in which events occur. duplication of terms and meaning should be

avoided and only the standardized languagemust be used.

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The steps of building the concerned tablesare given below.

1. Firstly figure out the most essential factors to beconsidered in making a decision.

This will identify the conditions involved in the decision.Only those conditions should be selected which have the

potential to either occur or not but partial occurrences arenot permissible.

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2. Determine the most possible steps that can take place

under varying conditions and not just under currentcondition. This step will identify the actions.

3. Calculate all the possible combinations ofconditions.

For every N number of conditions there are2*2*2. (N times) combinations to be considered.

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4. Fill the decision rules in the table. Entries in a decision table are filled as Y/N

action entries are generally marked as "X". For the conditions that are immaterial a hyphen "-" is

generally put.

Decision table is further simplified by eliminating and

consolidating certain rules. Impossible rules are eliminated.

There are certain conditions whose values do not affect thedecision and always result in the same action. These rulescan be consolidated into a single rule.

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Case study-Consider the recruitmentpolicy of ABC Software Ltd.

It the applicant is a BE then recruit otherwise not. If the person is from Computer Science, put him/her in

the software development department if the person is from non-computer science background

put him/her in HR department.

If the Person is from Computer Science and havingexperience equal to or greater than 3 years, take him/heras Team leader

if the experience is less than that then take the person asTeam member.

If the person recruited is from non Computer Sciencebackground, having experience less than three years,make him/her Management Trainee otherwise Manager

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Example

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Thank You.