GoalDescribe the 5 Vs of big data with a classroom example for each.
New words
volume · how much data there isvelocity · how fast new data arrives and must be handledvariety · how many different kinds of data there areveracity · how correct and reliable the data is
Explanation
Big data is described by five words that all begin with V. Volume: there is a very large amount, like a library with more books than anyone could read. Velocity: new data arrives very fast, like students pouring out of school when the bell rings, and it must be handled just as fast. Variety: there are many kinds, like a school bag with books, a lunch box and a ruler. Veracity (think of it as reliability): the data may contain mistakes, so it must be checked. A wrong mark in a register is a small example. Value: the data is only useful if it leads to a good decision, such as adding a bus where many students wait. Without value, a mountain of data is just a mountain.
V
Meaning
Classroom picture
Volume
a very large amount
a library with endless books
Velocity
speed of new data
students leaving at the bell
Variety
many kinds
a school bag with many things
Veracity
correct and reliable
a wrong mark in a register
Value
useful for a decision
adding a bus where it is needed
Worked examples
volume→velocity→variety→veracity→value
The canteen keeps a list of what students buy. After a month the list is very long (volume), new sales are added every minute (velocity), and it has numbers, words and times (variety). A staff member finds a sale marked as ten sandwiches instead of one (veracity). Using the corrected list, the canteen decides to cook more on Sundays (value).
Karim argues that more data always means better answers. His teacher shows a list in which half the numbers are wrong. Big does not mean good: the veracity (reliability) of the data matters as much as its volume.
Class activity
Choose an everyday thing, such as a football match or a bus line, and write one sentence for each V. For veracity, think how a mistake could appear. Show it to a classmate and see if they can guess the V from your sentence.
Practice
1
Which V means that data may contain mistakes?
Veracity, the correctness and reliability of the data.
2
Which V is about usefulness for a decision?
Value.
3
Students pouring out at the bell is a picture of which V?
Velocity: speed of new data.
4
Why does a big pile of data not always help?
If it is wrong or leads to no decision, it has no value.
