Note: The most common elements of language writing for journals and theses in Engineering are ideational and persuasive: you need to sell your ideas to your reader through clear organisation and an unfolding story in a format that is recognisable from the conventions of the genres.
i.i The functions of language:
Why am I using language?
Connections between ideas
i.ii The interpersonal aspects of language:
Who am I connecting with?
i.iii The ideational aspects of language:
What am I trying to share or explore?
i.i The textual aspects of language:
How is my text organised?