When we ask people to write expenditure for example, we would like to ask also the frequency. Ok that is possible with 2 questions, but with an important number of questions, design becomes awful.
Today :
______
Food
123
Frequency
Weekly
Beverage
253
Frequency
Monthly
Electricity
123
Frequency
Yearly
We would like :
____________
Description Amount Frenquency
Food 123 Weekly
Beverage 253 Monthly
Electricity 123 Yearly
[....]