Read this article and discover what are the main differences and similarities between statement of intern, statement of interest and statement of purpose. http://www.sopwriting.net/

2. Statement of Intent, Statement of Interest
and Statement of Purpose: Differences and
Similarities
Since these three terms can be easily mistaken between one another, we've
produced an article that explains the similarities and differences between them.
First, we're going to describe each of them, then go through what makes them
different or similar.
Statement of Intent
Some might think that merely having a good academic background is enough to
get accepted into the graduate school of your choice, but that is incorrect. You
often have to spend a great deal of time coming up with a great ​statement of
intent graduate school designed to convince the committee that you're among
the absolute top picks. This is because others are competing for the same
(limited) spots as well, so naturally, this creates a competitive environment.
This is hard enough as is for high schoolers looking to get into an university, so
you can imagine how tough this can be on others.

3. In your statement, you will need to answer questions such as:
- Why are you interested in the subject?
- What are your research plans?
- What skills do you posses that make you qualified for the program?
Statement of Interest
Similarly to the statement of intent, when ​writing a statement of interest​,
showing your professionalism is key. The difference is that your goal is not to
get into a specific school, but claim a specific job role.
With that in mind, you will need to answer the following type of questions:
- What set of skills will you bring to the table in case you're hired?
- Are you familiar with what the organization is all about?
- Do you have the qualities the employer is seeking?
Basically, the aim of this type of content is to convince your future boss that
you are a good fit for the company.

4. Statement of Purpose
Also known as application essay, cover letter, and personal background, when
writing an ​engineering statement of purpose (or any other), you only need to
look at the name to discern what your task is: is a couple of short sentences, you
need to explain what you're looking to get out of the academic program. Don't
only explain why you're seeking the challenge, but also what it means to you on
a personal level.
You can also make your ​academic statement of purpose better by revealing a
personal story that led you to your decision. Did something happen in your
childhood which you can draw some inspiration from? It's fine to mention these
events, but don't go overboard and keep it short and to the point.
Similarities and differences
As you can see, the aim of writing these is pretty much the same: convincing
someone you're a great fit. The differences are very subtle, and mostly have to
do with who you're targeting, whether it be a future employer or an academic
institution. Other than that, the name pretty much reveals it all, and if you stay
focused on your objectives, you will do just fine.
Still, if you feel like you need to help with ​sop accounting and writing these,
hiring a professional writing service can make matters much easier and less
stressful.
Here is more information about Statement
of Intent, Statement of Interest and
Statement of Purpose:
http://www.sopwriting.net