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Senior QA Automation Engineer (Python)

Roles
Whatever it is you have to do, there is always the most difficult stage and this stage is start. Once you take a pencil and do the first stroke, it gets easier. But what this first stroke should look like? In other words, what is the start in the designing process? The first of UX techniques to design an app is all about identifying roles. Hm...protagonist, secondary lead and all those guys extras who never get to talk? Not exactly, but these people are also important, no matter what you call them.

Whatever it is you have to do, there is always the most difficult stage and this stage is start. Once you take a pencil and do the first stroke, it gets easier. But what this first stroke should look like? In other words, what is the start in the designing process? The first of UX techniques to design an app is all about identifying roles. Hm...protagonist, secondary lead and all those guys extras who never get to talk? Not exactly, but these people are also important, no matter what you call them.

Use-case diagram / behavioral diagram
Behavioral diagram describes behavior of external users (actors) visually. It identifies the exact actions each actor can take. For example, if we talk about library, there are two actors here. One is a librarian, the other one is a library customer. The library customer can search for or borrow a book, whereas the librarian can search for a book, add a book and remove a book. In our realia, a Greeting Card app, for example, will have two actors, one of which will be a Congratulator, the other one - a Birthday Boy. The Congratulator can log in with Facebook, choose a friend from the list of friends integrated from Facebook, choose a card, write his wishes and send a card to the Birthday Boy. Let's assume, the latter does not have this app installed on his mobile device. He can get the notification about the greeting card sent by somebody he knows, come to the app store and install the Greeting Card application. Once there, the Birthday Boy can receive the card, like it and do whatever you wish him to do to enable the interaction with the Congratulator - send a reply, for instance. See below what the behavioral diagram for this case looks like.

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