EJCC really would probably be the best person to talk to about Te+Si. My perspective on Te is that it's primarily use is categorizing. It looks at a thing or situation, figures out what its purpose is and arranges categories based on that determination. Coupled with the auxiliary function, Te begins to work to define objectives either based on past principles (Si) or a future-oriented vision (Ni). The question Te seeks to answer is what characteristics need to be in place in order for a thing to fulfill a certain criteria. If you had a device, for instance, the thing that would make it a watch would be its ability to tell time. That focus on functionality is what makes Te-doms such efficiency nuts. We like to figure out how something can fulfill its purpose in as few steps as possible. Another corollary to that is that we're fairly adept at manipulating our environments. ENTJs have a particular knack for taking something and transforming it based on the understanding of it that Te (supported by Ni) lends us.
I'm tired, so I'm not sure if any of that makes sense.
It made sense.

And it all seems pretty much right to me. Though your watch/device example seemed pretty foreign to me, so maybe it was a more Ni thought process.
Also, re: the bolded, I don't know about other ESTJs, but the way I use my Ne can lend itself to something similar, for example with DIY projects. I find useless things around my house, or in garage sales, or in the trash, and I think "how can I make this into something useful?" and then my Ne seizes control of the Si memory-bank and throws possible ideas to Te, which decides on the final DIY project based on various criteria (e.g. difficulty, budget, available tools/work space, attractiveness of final product).
Ahh....Although I enjoy using Se much more than Si, I find that I use Si much more and I'm better at using it. I also prefer and use Ne much more than Ni. Fe never felt right either (although I don't exactly like Fe all that much, which may pose a bit of a problem). Essentially, after all of the confusion I created, I just went back and picked the type that I first scored on an MBTI test without knowing what it all meant yet. Am I an ISTJ? Maybe. Does it really matter? Nah.
Well, it obviously matters at least a little bit, or else you wouldn't be starting threads to find your correct type. I'm just sayin'.
Maybe now is when you look at general type descriptions and choose based on the broader whole, instead of the building blocks that form the whole?
For example: which forum members do you relate to more? You seem almost like a younger and more random [MENTION=9486]gromit[/MENTION], sometimes, and she's an ISFP 9.
Well, I have difficulty understanding the JCFs. It's not anyone's description that is at fault. I just have a hard time with abstract concepts. Examples are my thing.
Well, you're definitely a Sensor, then! ISxx it is.
Hmm...this makes me wonder if I should instead create a thread about "work personality" vs. "having fun personality." The reason I say this is because I've always thought of Te in a rather businesslike way. And while it is very businesslike, um. Something something..
Okay I forgot my train of thought, but I know there was definitely a point in here. Can anyone intuitively tell what I was trying to say and if this is a good idea? I seem to be good at creating pointless threads.
I'm not sure if I 100% get where you were going with that, but I can tell you that Te is a way of life for Te-users; you can't put your Te on before you leave for work, and take it off to hang up on your coat rack when you get home. (I find that that sort of function attitude makes more sense with inferior functions, e.g. my INTP dad definitely puts on and take off his Fe at will.) The way people describe Te does make it seem more business-related, you're right, but that's just because business language has irreparably seeped into MBTI descriptions (probably because of how frequently the MBTI is used in the workplace, vs. in other environments).
Take my experience on this thread, as an example. I entered it because I was essentially given a task by Rex and SD: Use your expertise/experience and help the other TJs make Te clear for the Te-uninitiated. So I came in, methodically responded to just about everyone in the thread in chronological order (to complete the task as thoroughly and excellently as I can), and my on-topic responses have all been formatted thus: Thesis statement. Bullet points: 1) 2) 3). The End. No frills. Like others have been saying: Get the task done as efficiently as possible.
And the thing is: this is all pretty much stream-of-consciousness. I don't have to work hard at all to operate like this. Meaning, the way I think really
is that direct, a lot of the time. Yes, I go on Ne tangents sometimes, and yes, I do tend to feel like my mind is much more chaotic than my interaction style would lead you to believe. But the fact that I'm entering this thread like "Here is my input. Here is why it makes sense. Boom, boom, boom, point A, point B, point C. Done." is a pretty excellent example of "mundane" Te, i.e. Te in everyday life. And you can likely see, from how I phrased it, that it is VERY similar to workplace Te, just funneled into a different environment, with different goals laid out for it to accomplish.
(Edit: I've also been told by various forum members, including [MENTION=1456]Domino[/MENTION], that I communicate very, very clearly, concisely, and simply, to a degree that surprises them. Whereas I look at my own posting style and think "God damn it why do I use all these excess words? I don't NEED all these qualifiers!"

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