In the past, the absolute maximum level of attributes a person could get was 10. No higher, no matter what you did.

You could have an attribute at 10, but when you wore something that gave additions to that attribute that would push it above 10 - usually armor or drugs - it wouldn't push.

So I ask for a way for that to be possible.

Why would anyone want to do this? Well first, it has more of a use for drugs, and a reason to face the addiction. Imagine having INT at 10, then wear a helmet that gives +1 INT and a drug that gives +1 INT. Now you have 12 INT. That would affect your experience gain, wouldn't it? Well what about Intellectual skills above 10?

There are 2 ways this can be handled:

Version 1 is that there will be additional perks you can choose at level up that are above 10. When you push your attribute above that level, those perks become live. If your attribute falls below that for some reason, then you loose it. At the same time, I think that if that makes you unable to use another perk that has a requirement of an attribute at a certain level, then you loose that perk till you fix it.

Version 2 is that there's just a note at the base of every attribute tree. For every +1 gained in this attribute above 10, gain X perk. That'd make it real hard to get above maybe +3 - 5 above 10, but it's possible with extreme effort, cost and even sacrifice

you CAN have SPECIAL above 10. First off, if you have 10 in a stat, and obtain a bobblehead, it goes to 11, also, wearing gear that increases special makes it go above 10, I have heard of people with like 20 endurance with all the drugs used and gear equipped.

You can do this.. drugs and perks can boost your stats above 10.. Some drugs also stack. For instance, Solar Powered is an Endurance 10 stat perk that adds 2 to your endurance and and strength during the day. That gives you a 12 Endurance. I currently have 1 perk in Night Person and a perception of 8.. That gives me a 10 perception. Wearing eyewear adds another point of perception so at night I have an 11 in perception.

I actually believe that I read somewhere that, though you can boost your SPECIAL above 10 in Fallout 4, the effects of any stats above 10 is almost neglible. I cannot confirm this, however, as I have never tried to do this myself.

It works... trust me, otherwise I would not have been able to destroy BoS with piper...

proofs:

http://postimg.org/image/bftbfyfr9/

and here's most of the things I had taken for that:

http://postimg.org/image/8oy5gyw9t/

aaaand just for fun:

http://postimg.org/image/gx5ywi54t/

Sturges hiding in the bush having a good ol' jimmy

Well, there you have it. Photographic evidence. You can boost stats above 10 and they can be used to incredible effect.