I have been working on an invention for my company for the last few months and it has just been completed. I came up with the idea entirely on my own but I asked a more senior member of the company if it was done before (it wasn't) and since then, have been consulting with them on my calculations to quantify the impact. More specifically, I would do all the calculations and research, then would send them the document for submission so that they could browse it and give critique. Essentially they were a reviewer and consultant to strengthen my invention claim. Nonetheless, they were very helpful and I appreciate their support.
There's an internal system that allows me to submit the invention document to our company's law dept and on the list of inventors to name, I of course have the option to include them. However, since it is entirely digital, when I put their name down, it automates it so that it gives equal credit to them as me. This is not accurate in terms of the amount of work put in, but I assume this is an internal item and has nothing to do with when the actual patent is filed. I assume all that matters is that I am listed as the lead. However, would be nice to get an opinions from others if I should include the consultant as an inventor.