Draw the Decision Tables, and explain your answer. A credit union offers two typ

Question

Draw the Decision Tables, and explain your answer.

A credit union offers two types of savings account: regular rate
and split rate. The regular rate account pays dividends on the
account balance at the end of each quarter—funds withddrawn
during the quarter earn no dividends. There is no minimum
balance on the regular rate account. Regular rate accounts may
be insured. Insured accounts pay 5.75 percent annual interest.
Uninsured regular rate accounts pay 6.00 percent annual interest

For split rate accounts, dividends are paid monthly on the average
daily balance for that month. Daily balances go up and down
according to deposits and withdrawals. The average daily balance
is determined by adding each day's closing balance and dividing
this sum by the number of days in the month. If the average daily
balance is less than 25, then no dividend is paid. Otherwise, if the
average daily balance is 25 or more, 6 percent per annum is paid
on the first 500, 6.5 percent on the next 1,500, and 7 percent on
funds over 2000. There is no insurance on split rate accounts.

Explanation / Answer

Answer:

Decision tables are very much helpful in test design technique – it helps testers to search the effects of combinations of different inputs and other software states that must correctly implement business rules. Also, provides a regular way of stating complex business rules, that’s helpful for developers as well as for testers. Testing combinations can be a challenge, as the number of combinations can often be huge. It assists in development process with developer to do a better job. Testing with all combination might be unrealistic or unfeasible. We have to be happy with testing just a small subset of combinations but making the option of which combinations to test and which to leave out is also significant. If you do not have a efficient way of selecting combinations, an arbitrary subset will be used and this may well result in an ineffective test effort.

A decision table is basically an outstanding technique used in both testing and requirements management. It is a structured exercise to prepare requirements when dealing with complex business rules. Also, used in model complicated logic.

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