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The first step in FPA is defining boundary. There are two types of major boundaries:

We will state features of external application boundary, so that internal application boundary would be self explained.

External Application Boundary can be identified using following litmus test:

Does it have or will have any other interface to maintain its data, which is not

Developed by you. Example: Your Company is developing an “Accounts

Application” and at the end of accounting year, you have to report to tax

Department. Tax department has his own website where companies can connect

and report there Tax transaction. Tax department application has other

Maintenance and reporting screens been developed by tax software department.

These maintenance screens are used internally by the Tax department. So Tax

Online interface has other interface to maintain its data which is not your scope,

thus we can identify Tax website reporting as External Application.

your application interacts with Tax Department Application probably your

code have to interact through Tax Department API.

The best litmus test is to ask yourself do you have full access over the system.

If you have full rights or command to change then its internal application

boundary or else external application boundary.

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