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In this case there's not really a right answer because there's

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many, many features that you could identify in a piece of

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software as complex as a, a spreadsheet. So I'm just going

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to give you three examples. So one could be the cell merging

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operation. So the operation in which we merge two cells in

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the spreadsheet. Another example could be chart creation, so I might want

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to test the feature that allows you to create charts in

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your spreadsheets. Yet another example could

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be the test of statistical functions,

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so the function that allows you to do various statistical calculations on

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the numbers in your cells. And as I said there's many, many

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more example that we could use. But the key thing I want

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to convey here is the fact that there is no way you

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can look at a spreadsheet with all the functionality that it provides

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and just go and test it. The first step, what you need

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to do first, is to identify which ones are the pieces of

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functionality that I can test individually. So that's why this is the

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first step in black-box testing.