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Video Title: Decision Tables
Description: Decision Tables
Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm
Lecture By: Mr. Arnab Chakraborty, Tutorials Point India Private Limited
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In this session, we are going to discuss
decision table.

Decision table
is nothing but one tabular

representation to denote
the logic of a program.

And in this particular case, whether the
condition is true or false, depending upon

that,
what are the actions to be taken that

will be represented
using this decision table.

So, a decision table represents conditions
and the respective actions to be taken to

address them in a structured tabular
format.

It is a powerful tool to debug and prevent
errors.

So, it is a very easy way to represent our
logic and the respective actions to be

carried out and there
will be no ambiguity to

understand
the logic and the respective actions.

It helps group similar information into a
single table and then by combining tables,

it delivers easy and convenient decision
making.

So, decision table is actually used to
represent our decision making processes.

So, creating a decision table.

To create the decision table, the
developer must follow the following four

basic steps.

So, what are they?

Identify all possible conditions
conditions to be addressed.

Determine actions for all identified
conditions.

Create maximum possible rules.

Obviously, I should not go for redundant
rule creations,

but whatever is
possible in the respective business logic.

So, create maximum possible rules and
define action for each rule.

And decision table should be verified by
end users and can likely be simplified by

eliminating duplicate rules and the
respective actions.

Now, let us go for one example for the
better understanding.

Let us take a simple example of day to day
problem with our internet connectivity.

We begin by identifying all problems that
can arise while

starting the internet and
their respective possible solutions.

So, let us go for this
problem in a tabular

representation in the
form of decision table.

So, we list all
possible problems under column conditions

and the prospective actions under the
column actions.

So, here we are having this conditions and
here we are having this respective actions.

So, what are the actions and conditions
are to be represented and there we are

having this rules, we are denoting that
one using the combination yes and no.

So, shows shows connected, ping is
working, open website.

So, these
are the three conditions we are having

and here
we are having the respective actions.

So, conditions are there and the actions
are there.

So, that has been depicted here in a very
clear way.

So, when shows connected is not appearing,
ping is working is not appearing,

open website is appearing,
then check internet

Internet cable and
check internet router.

So, these are the respective actions to be
taken.

So, in this way how many conditions we are
having?

We are having here 3 conditions.

So, if you consider yes and no for each
and every condition.

So, how many combinations we are
expecting?

We are expecting 8 combinations.

So, you can find that 8 rules are there.

You can find it and the respective actions
we are denoting that one.

So, similarly I can
also go for no, no, no for

all of them
then go for contact service provider.

So, so there And that is the respective
actions to be taken.

In this way, you can find that what are
the different conditions and what are the

respective actions to be taken that has
been represented in a very easy way in a

tabular format using Decision Table.

So, we have discussed Decision Table.

We have given you one example for your
better understanding.

Thanks for watching this video.