Certain careers should have specific stats that complement them, also there should be stats that don't. These are some rules that limit certain careers by limiting the level of key stats. Each career will have 2 Focus Stats. Focus stats will usually be higher than normal for that career. Whether the reason for the high stat is because they need it to survive, or they can't function in that career without it. Each career will also have 2 Unfocus Stats. These are stats that the career doesn't require it or it's a career that takes away time for that stat to be high. Here's a list of the careers and their Focus/Unfocused Stats:

Career
Focus
Unfocus
Cop
COOL & MA
EMP & TECH
Corp
INT & LUCK
EMP & MA
Fixer
COOL & INT
TECH & REF
Media
INT & EMP
BOD & REF
Medtech
TECH & INT
BOD & REF
Netrunner
INT & TECH
BOD & MA
Nomad
BOD & INT
ATTR & LUCK
Prowler
REF & TECH
BOD & ATTR
Rockerboy
COOL & ATTR
INT & MA
Solo
REF & COOL
EMP & TECH
Techie
TECH & INT
MA & ATTR

Now to how to use this chart. There are two ways, depending on how you make characters.
The first is if you use dice rolls for stats. For Focused Stats roll a d6+4. This gives the character a good chance of rolling high. For Unfocused Stats you roll 1d6. On a roll of 6 reroll. If the you get a 1 or 2, then add it to the 6. If you roll a 3 or higher you keep the 6.
Secondly, if your are using a point base stat system here's what you do. For Focused stats the first 3 points are free. For Unfocused stats for every point over 5 it costs double the normal amount of points, up to a max stat of 8.