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This chapter is from the book

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This chapter is from the book

This chapter is from the book

Fluent C#Fluent C#

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Use Cases

Use cases are just step-by-step descriptions of how a piece of software interacts with people or other software.

“Keeping track of our suppliers is a nightmare. We know what we have and what we need, but nobody can remember who has the best zucchinis or veal. I need to be able to pick the ingredient, and have the computer tell me the best place to get it.”

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Let’s walk through putting together a simple use case. Based on Neil’s description of the problem, we can extrapolate an interaction that looks like this:

  1. System displays list of products, alphabetically by type (vegetable, meat, herb, etc.).
  2. User selects item from list; system displays top three suppliers, ordered by preference. For each supplier, display name, phone number, and delivery time.

And that’s it. It may not seem like it, but that really is enough to get started. (You want to make sure you only do enough to get started. It’s easy to over-complicate these things, and that’s a mistake.)

Notice, though, that this use case implies a few others—if the system is displaying a list of ingredients, that list has to be stored somewhere, and there has to be some way to enter it. Same with suppliers. But those are separate use cases. Make a note that they exist, but don’t let them distract you!

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Last Update: November 17, 2020