>1. Ter a possibilidade de exportar o ficheiro a que se refere a Portaria n. 321-A/2007, de 26 de março;
>2. Possuir um sistema que permita identificar a gravação do registo de faturas ou documentos equivalentes e talões de venda, através de um algoritmo de cifra assimétrica e de uma chave privada de conhecimento exclusivo do produtor do programa;
>4. Não dispor de qualquer função que, no local, ou remotamente, permita alterar, direta ou indiretamente, a informação de natureza fiscal, sem gerar evidência agregada à informação geral.
> >2. *secção inicial* -> requisito funcional: garantir a integridade dos dados; *secção da encriptação simétrica* -> requisito não funcional : é um requisito tecnológico
>>- Option 1 contains non-requirements but has to do with the development of the software, thus it's important to be included in the requirement phase.
>>- Option 2 has nothing to do with the development at all and contains restrictive directives.
>>- Option 2. pertains to the directives that will define how the system will be maintained and managed in the future.
>>- Option 3. defines the circumstances around the project: it touches budget, the team members, other departments (than the development team), etc. It is too encompassing and it is not always about the development of the system. *The requirements document should be in the project documents*, not the other way around.
>>Non-functional requirements are, colloquially, an enumeration of restrictions to the functional requirements being defined by a developing system.
>>Non-functional requirements are the buffer of quality of the product - these cannot be defined later. Their determination may take even more time than the definition of functional requirements since, sometimes, they can be even more implicit than their counterpart, the functional requirements. Their determination should also be independent of resources or budgets; otherwise, there can/will be consequences on the quality of the software.
