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  In this section of the Institute we will explore the diverse combinations of individuals and civilizations that make up the community of sentients.

FIRST THE BASICS:
       Memory Beta Planetary Classification (modified from Memory Alpha's)
                                                                          ATMOSPHERE:  
                                            reducing                         none                       oxidizing             
                               normal       dense        tenuous                     normal          thin    variable   
SURFACE:
radiant                        A
non-radiant                 B
Fe/Si                                            C
Ni/Fe/Si                                                          D
Si+                                                I                                                E              F
Si                                                                                   J                               G            H              
Si/H2O  (inactive)                                                          K               L
Si/H2O  (active)                                                                              M
H2O                                                                S                             N             O            P
non-H2O                                                         T            U                              Q            R      

   According to the handy Kardashev-Sagan socio-economic classification system, societies can be objectively designated by the two dimensions of their energy level and information level, which are usually but not always, correlated.
K = (log(E) - 6)/10 where E is in watts; S = log(I) - 6 where I is in bits, so that the 23rd-Century Federation ranks as 1.2S.
                0.3           0.4            0.5            0.6              0.7            1.0          2.0          3.0              4.0
A
B            gatherer
C
D                          hunter
E
F                                            agricultural                post-nuclear
G                                                              industrial                                                           post-industrial
H                                                                                  nuclear
Q                                                                                                   solar
Z
F'  
Q'
Z'
F"                                                                                                             antimatter
Z"                                                                                                                                             wormhole

  The Smith-Kinnison classification system similarly codifies the diverse combinations of  species' characteristics humanocentrically. 100% Human would be AAAAAAAA or briefly A8
          air           temp.      torso             head            arms            legs              skin                 locomotion  
A
oxygen
310 K
4 limbs
2 eyes,
1 mouth,
 1 nose
2 arms
2 legs
soft, hairy, sweating
walking
B
air with inerts
320 K
4 arms
3 legs
soft, hairless, sweating
crawling
C
near air
300 K
6 arms
4 legs
soft, hairy, sweatless
burrowing
D
nitrogen
330 K
armless
6 legs
soft, hairless, sweating
hopping
E
carbon dioxide
290 K
2 arms, double elbowed
8 legs
hard, hairy, sweating
jumping
F
methan
340 K
1 leg
hard, hairless, sweaty
running
G
ammonia
280 K
leg-arms
hard, hairless, sweatless
walking & flying
H
chorine
350 K
hard, hairy, sweatless
crawling & burrowing
I
oxygen, carbon dioxide
270 K
hairy, slimy
hopping & jumping
J
360 K
scaly, slimy
K
260 K
L
370 K
eyeless, mouthless, noseless
M
240 K
N
380 K
trunk-arms
O
poison
220 K
3 arms
P
200 K
4 arms
eyeless,
2 mouths, 2 noses
4 cylindrical legs
thin, slimy
Q
400 K
2 arms, 2 tentacles
3 mouths, 3 nostrils
double-shouldered
thick, slimy
climbing & swimming
R
air-energy
180 K
4 tentacles
4 mouths, 4 nostrils
thick, dry
climbing & crawling
S
electricity
160 K
6 tentacles
4+ mouths
carapaceous
climbing & swinging
T
water
440 K
6+ tentacles
armored
swinging
U
water vapor
80 K
fluked
gliding
V
mattergy
40 K
unfluked
neckless
flying
W
energy
480 K
bimorphous
finned
floating
X
space-time
20 K
trimorphous
SSP
8+ legs
blubbery
swimming
Y
time
10 K
polymorphous
ESP
leg-fins
transparent
jetting
Z
nothing
5 K
amorphous
headless
limbless
PK
skinless
interpenetrating