At first glance, I agree with most others that "the idea itself is worth 0%". Having said that, we all know that's not <i>always</i> true...there's a looooong list of ideas that were so brilliant at the time of their inception that - combined with good fortune and perfect timing - the initial crappy implementation had no real negative impact (hello, Windows 3.0, hello Facemash, etc.).<p>So your idea may be brilliant...probably not, but maybe so :-) If you have already prototyped it out, have a basic wireframe built, have a good business plan in place, and have some funding lined up (either your own or from some external source) I would say that a technical co-founder would be <i>at most</i> worth 20-25%. From the gist of your question, though, it sounds like you have an idea in your head and that's about it. If that's the case, you gotta find your co-founder and immediately agree to a 50/50 split...maybe give them a 6-8 week 'trial phase' just to make sure they aren't a total fruitcake and are going to bail out on you, then lock it all down legally and move forward from there.<p>What people are trying to tell you in the other posts is that HARD skills >> SOFT skills when it comes to launching a tech company in the very early stages. Look at your descriptions:<p>* "business-minded" - hard to quantify
* "action-oriented" - every great developer on earth is this as well
* "team-building" - if you were great at this, your first stop wouldn't be at Hacker News for advice on how to build a team
* "selling" - I agree that this is actually a HARD skill - either you got it or you don't. If you have demonstrated track record in this area, this is your trump card.
* "partnerships" - soft skill...mostly manipulating paperwork with lawyers at the end of the day
* "strategy" - you will easily be splitting this one 50/50 with your technical co-founder<p>Meanwhile, a good tech co-founder is going to bring:<p>* Specific dev experience - hard skill
* Knowledge of architecture and scalability - hard skill
* Knowledge of SEO and online technical marketing - hard skill
* Ability to augment his/her skill with other good tech people out there, selecting from their own personal experience or interviewing based on their own skills - hard skill (i.e. business guy has no hope of locating and finding these people, IMHO)<p>Sorry for the long explanation. Bottom line: you gotta go 50/50. If your guy is not worth 50% in your mind, you have the wrong person.