;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Variable and Breed declarations ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

globals
[
  ;; quick start instructions variables
  quick-start  ;; current quickstart instruction displayed in the quickstart monitor
  qs-item      ;; index of the current quickstart instruction
  qs-items     ;; list of quickstart instructions

  ;; variables related to the health of the turtles
  old-num-infected          ;; number of turtles that had infected? = true during the last pass through the go procedure
  current-num-infected      ;; number of turtles that have infected? = true during the current pass through the go procedure
  old-show-ill-on-clients?  ;; holds the value of show-ill-on-clients? during the last pass through the go procedure

  ;; lists used to create the various turtles
  shape-names       ;; list that holds the names of the non-sick shapes a student's turtle can have
  colors            ;; list that holds the colors used for students' turtles
  color-names       ;; list that holds the names of the colors used for students' turtles
  used-shape-colors ;; list that holds the shape-color pairs that are already being used

  ;; misc
  clock        ;; keeps track of the number of times through the go procedure (if there is at least one turtle infected)
  max-possible-codes ;; total number of possible unique shape/color combinations
]

turtles-own
[
  infected?    ;; if a turtle is ill, infected? is true, otherwise, it is false
  base-shape   ;; original shape of a turtle
  step-size    ;; the amount that a turtle will go forward in the current direction
]

breeds
[
  androids  ;; created by the CREATE ANDROIDS button; not controlled by anyone, but can become sick and spread sickness
  students  ;; created and controlled by the clients
]

students-own
[
  user-id  ;; unique id, input by the client when they log in, to identify each student turtle
]


;;;;;;;;;;;;;;;;;;;;;
;; Setup Functions ;;
;;;;;;;;;;;;;;;;;;;;;

to startup
  setup
  setup-quick-start
  hubnet-set-client-interface "COMPUTER" [ "clients/Disease client.nlogo" ]
  hubnet-reset
end

;; Initializes the display, and creates a list that contains the names of the shapes
;; used by turtles in this activity.  Also initializes the data lists.
to setup
  cp
  ct
  cc
  setup-vars
  setup-plot
end

;; initialize global variables
to setup-vars
  set clock 0

  set old-num-infected 0
  set current-num-infected count turtles with [infected?]
  set old-show-ill-on-clients? show-ill-on-clients?

  set shape-names ["wide wedge" "square" "car" "thin wedge" "big boat" "pickup truck"
                   "nu" "uu" "circle" "butterfly" "wolf" "sheep" "lobster" "monster"
                   "moose" "bear" "teddy bear"]
  set colors      [ white   gray   brown   yellow   green   lime   turquoise
                    cyan   sky   blue   violet ]
  ;; adjust a few colors so they don't blend in with the red infection dot too much
  set colors lput (orange + 1) colors
  set colors lput (magenta + 0.5) colors
  set colors lput (pink + 2.5) colors
  set color-names ["white" "gray" "brown" "yellow" "green" "lime" "turquoise"
                   "cyan" "sky" "blue" "violet" "orange" "magenta" "pink"]
  set max-possible-codes (length colors * length shape-names)
  set used-shape-colors []
end

;; initialize the plot
to setup-plot
  clear-all-plots
  set-current-plot "Number Sick"
  set-current-plot-pen ("num-sick" + data-set)
  set-plot-y-range 0 (initial-number-sick + 5)
end

;; creates turtles that wander at random
to create-androids
  create-custom-androids number
  [
    setxy (random-float screen-size-x) (random-float screen-size-y)
    set color gray
    set heading (random 4) * 90
    set infected? false
    set base-shape "android"
    set shape base-shape
    set step-size 1
  ]
end

;; give the user some information about what the setup button does so they can 
;; know whether they want to proceed before actually doing the setup
to setup-prompt
  if user-yes-or-no? ("The SETUP button should only be used when starting "
              + "over with a new group (such as a new set of students) since "
              + "all data is lost.  Use the RE-RUN button for continuing with "
              + "an existing group."
              + "\n\nDo you really want to setup the model?")
  [
    user-message "Before closing this dialog, please do the following:"
                 + "\n  -Have everyone that is currently logged in, log off and "
                 + "then kick all remaining clients with the HubNet Console."
    setup
  ]
end


;;;;;;;;;;;;;;;;;;;;;;;
;; Runtime Functions ;;
;;;;;;;;;;;;;;;;;;;;;;;

to go
  every 0.1
  [
    ;; get commands and data from the clients
    listen-clients

    ;;allow the androids to wander around the graphics window
    if wander?
    [ androids-wander ]

    check-infect

    ;; increment the clock if there are infected turtles and plot the data
    if current-num-infected > 0 and current-num-infected > old-num-infected
    [
      ;; plot the new data
      plotxy clock current-num-infected
      set old-num-infected current-num-infected
    ]
    if current-num-infected > 0
    [ set clock clock + 1 ]
  ]
end

;; controls the motion of the androids
to androids-wander
  every android-delay
  [
    ask androids
    [
      rt (random 4) * 90
      fd move-amount
    ]
  ]
end

;; report the amount we can move in the current direction
;; if we don't want to wrap around the screen
to-report move-amount  ;; turtle procedure
  locals
  [
    ;; the value of either pxcor or pycor depending upon if
    ;; we are moving vertically or horizontally
    new-pcor  
    ;; the value of either screen-edge-x or screen-edge-y
    ;; depending upon if we are moving vertically or horizontally
    screen-edge
  ]
  ifelse heading mod 180 = 0
  [
    set screen-edge screen-edge-y
    ifelse heading = 0
    [ set new-pcor pycor + step-size ]
    [ set new-pcor pycor - step-size ]
  ]
  [
    set screen-edge screen-edge-x
    ifelse heading = 90
    [ set new-pcor pxcor + step-size ]
    [ set new-pcor pxcor - step-size ]
  ]
  ;; if we would step past a patch at the edge of the graphics window,
  ;; make us step onto the edge patch
  if abs new-pcor > abs screen-edge
  [ report step-size - ( abs new-pcor - abs screen-edge ) ]
  report step-size
end

;; causes healthy turtles with an infected turtle on the same patch
;; to test to see if they get sick
;; then have any infected turtles set their shape to the sick shape 
to check-infect
  ask turtles with [not infected? and any? other-turtles-here with [infected?]]
  [
      if ((random 100) + 1) <= infection-chance
      [ get-sick ]
  ]
  ask turtles with [infected?]
  [ set-sick-shape ]

  ;; count the number of infected turtles each time, otherwise we could get more infected
  ;; turtles than turtles if an infected turtle dies and a new one is created later on
  set current-num-infected count turtles with [infected?]
end

;; turtle procedure -- set the appropriate variables to make this turtle sick
to get-sick
  set infected? true
  if (breed = students)
  [ update-sick?-monitor ]
end

to update-sick?-monitor
  ifelse show-ill-on-clients?
  [ hubnet-send user-id "Sick?" infected? ]
  [ hubnet-send user-id "Sick?" "N/A" ]
end

;; turtle procedure -- change the shape of turtles to its sick shape
;; if show-ill? is true and change the shape to the base-shape if
;; show-ill? is false
to set-sick-shape
  ifelse show-ill?
  [
    ;; we want to check if the turtles shape is already a sick shape
    ;; to prevent flickering in the turtles
    if ( shape != ("sick " + base-shape) )
    [ set shape "sick " + base-shape ]
  ]
  [
    ;; we want to check if the turtles shape is already a base-shape
    ;; to prevent flickering in the turles
    if (shape != base-shape)
    [ set shape base-shape ]
  ]
end

;; causes the initial infection in the turtle population --
;; infects a random healthy turtle until the desired number of
;; turtles are infected
to infect-turtles
  locals
  [
    healthy-turtles ;; a list that holds the who values of all the turtles that are healthy
    doomed-turtle   ;; a random who from the healthy-turtles list
  ]

  set healthy-turtles values-from (turtles with [not infected?]) [who]

  repeat initial-number-sick
  [
    ifelse length healthy-turtles = 0
    [
      user-message "There are no more healthy turtles to infect.  Infection stopped."
      stop
    ]
    [
      set doomed-turtle random-one-of healthy-turtles
      ask turtle doomed-turtle
      [ get-sick ]
      set healthy-turtles remove doomed-turtle healthy-turtles
    ]
  ]
  ask turtles with [ infected? ]
  [ set-sick-shape ]
end

;; heals all sick turtles,  clears and sets up the plot, 
;; and clears the lists sent to the calculators
to cure-all
  set clock 0
  ask turtles
  [
    set infected? false
    if breed = students
    [ update-sick?-monitor ]
    set shape base-shape
  ]

  set old-num-infected 0
  set current-num-infected 0
  set old-show-ill-on-clients? show-ill-on-clients?

  ;; setup the plot
  setup-plot-for-rerun
end

to setup-plot-for-rerun
  set-current-plot-pen ("num-sick" + data-set)
  plot-pen-reset
end


;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Quick Start functions ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; instructions to quickly setup the model, and clients to run this activity
to setup-quick-start
  set qs-item 0
  set qs-items
  [
    "Teacher: Follow these directions to run the HubNet activity."
    "Optional: Zoom In (see Tools in the Menu Bar)"
    "Optional: Change any of the settings...."
      "If you do change the settings, press the SETUP button."
    "Press the GO button."
    "Everyone: Open up a HubNet Client on your machine and..."
      "input the IP Address of this computer, type..."
        "your user name in the user name box and press ENTER"
    "Teacher: Have the students move their turtles around to..."
      "acquaint themselves with the interface."
    "Press the INFECT NetLogo button to start the simulation."
    "Everyone: Watch the plot of the number infected."
    
    "Teacher: To rerun the activity with the same group,..."
      "stop the model by pressing the NetLogo GO button, if it is on."
        "Change any of the settings that you would like."
    "To overlay the new run's plot data change the value of the slider DATA-SET."
      "If you set DATA-SET to a value that already had data..."
        "in it, the new data will over-write the old data."
    "Press the NetLogo RE-RUN button."
    "Teacher: Restart the simulation by pressing the NetLogo GO button again."
      "Infect some turtles and continue."
    
    "Teacher: To start the simulation over with a new group,..."
      "stop the model by pressing the NetLogo GO button, if it is on..."
        "and follow these instructions again from the beginning."
  ]
  set quick-start (item qs-item qs-items)
end

;; view the next item in the quickstart monitor
to view-next
  set qs-item qs-item + 1
  if qs-item >= length qs-items
  [ set qs-item length qs-items - 1 ]
  set quick-start (item qs-item qs-items)
end

;; view the previous item in the quickstart monitor
to view-prev
  set qs-item qs-item - 1
  if qs-item < 0
  [ set qs-item 0 ]
  set quick-start (item qs-item qs-items)
end


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Code for interacting with the clients ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; determines which client sent a command, and what the command was
to listen-clients
  while [ hubnet-message-waiting? ]
  [
    hubnet-fetch-message
    ifelse hubnet-enter-message?
    [ create-new-student ]
    [
      ifelse hubnet-exit-message?
      [ remove-student ]
      [ execute-command hubnet-message-tag ]
    ]
  ]
  
  if old-show-ill-on-clients? != show-ill-on-clients?
  [
    ask students
    [
      ;; update the Sick? monitor on the clients whenever they act.
      update-sick?-monitor
      set old-show-ill-on-clients? show-ill-on-clients?
    ]
  ]
end

;; NetLogo knows what each student turtle is supposed to be
;; doing based on the tag sent by the node:
;; step-size - set the turtle's step-size
;; Up    - make the turtle move up by step-size
;; Down  - make the turtle move down by step-size
;; Right - make the turtle move right by step-size
;; Left  - make the turtle move left by step-size
;; Get a Different Turtle - change the turtle's shape and color
to execute-command [command]
  if command = "step-size"
  [
    ask students with [user-id = hubnet-message-source]
    [ set step-size hubnet-message ]
    stop
  ]
  if command = "Up"
  [ execute-move 0 stop ]
  if command = "Down"
  [ execute-move 180 stop ]
  if command = "Right"
  [ execute-move 90 stop ]
  if command = "Left"
  [ execute-move 270 stop ]
  if command = "Change Appearance"
  [ execute-change-turtle stop ]
end

;; Create a turtle, set its shape, color, and position
;; and tell the node what its turtle looks like and where it is
to create-new-student
  create-custom-students 1
  [
    setup-student-vars
    send-info-to-clients
    ;; we want to make sure that the clients all have the same plot ranges,
    ;; so when somebody logs in, set the plot ranges to themselves so that 
    ;; everybody will have the same size plots.
    set-plot-y-range plot-y-min plot-y-max
    set-plot-x-range plot-x-min plot-x-max
  ]
end

;; sets the turtle variables to appropriate initial values
to setup-student-vars  ;; turtle procedure
  set user-id hubnet-message-source
  set-unique-shape-and-color
  setxy random screen-size-x random screen-size-y
  set heading random-one-of [0 90 270]
  set infected? false
  set step-size 1
end

;; pick a base-shape and color for the turtle
to set-unique-shape-and-color
  locals [code]
  set code random max-possible-codes
  while [member? code used-shape-colors and count students < max-possible-codes]
  [
    set code random max-possible-codes
  ]
  set used-shape-colors (lput code used-shape-colors)
  set base-shape item (code mod length shape-names) shape-names
  set shape base-shape
  set color item (code / length shape-names) colors
end

;; report the string version of the turtle's color
to-report color-string [color-value]
  report item (position color-value colors) color-names
end

;; sends the appropriate monitor information back to the client
to send-info-to-clients
  hubnet-send user-id "You are a:" (color-string color) + " " + base-shape
  hubnet-send user-id "Located at:" ("(" + pxcor + "," + pycor + ")")
  update-sick?-monitor
end

;; Kill the turtle, set its shape, color, and position
;; and tell the node what its turtle looks like and where it is
to remove-student
  ask students with [user-id = hubnet-message-source]
  [
    set used-shape-colors remove my-code used-shape-colors
    die
  ]
end

;; translates a student turtle's shape and color into a code
to-report my-code
  report (position base-shape shape-names) + (length shape-names) * (position color colors)
end

;; Cause the students to move forward step-size in new-heading's heading
to execute-move [new-heading]
  ask students with [user-id = hubnet-message-source]
  [
    set heading new-heading
    ;; don't allow students to wrap around the screen
    ;; so use move-amount instead of step-size
    jump move-amount
    hubnet-send user-id "Located at:" ("(" + pxcor + "," + pycor + ")")
  ]
end

to execute-change-turtle
  ask students with [user-id = hubnet-message-source]
  [
    set used-shape-colors remove my-code used-shape-colors
    show-turtle
    set-unique-shape-and-color
    hubnet-send user-id "You are a:" (color-string color) + " " + base-shape
    if infected?
    [ set-sick-shape ]
  ]
end


; *** NetLogo Model Copyright Notice ***
;
; This activity and associated models and materials was created as part of the projects:
; PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and 
; INTEGRATED SIMULATION AND MODELING ENVIRONMENT.
; These projects gratefully acknowledge the support of the 
; National Science Foundation (REPP & ROLE programs) -- grant numbers 
; REC #9814682 and REC-0126227.
;
; Copyright 2002 by Uri Wilensky & Walter Stroup. Updated 2002. All rights reserved.
;
; Permission to use, modify or redistribute this model is hereby granted,
; provided that both of the following requirements are followed:
; a) this copyright notice is included.
; b) this model will not be redistributed for profit without permission
;    from the copyright holders.
; Contact the copyright holders for appropriate licenses for redistribution 
; for profit.
;
; To refer to this model in academic publications, please use:
; Wilensky, U. & Stroup, W. (2002).  NetLogo HubNet Disease model.
; http://ccl.northwestern.edu/netlogo/models/HubNetDisease.
; Center for Connected Learning and Computer-Based Modeling,
; Northwestern University, Evanston, IL.
;
; In other publications, please use:
; Copyright 1998 by Uri Wilensky and Walter Stroup.  All rights reserved.  See
; http://ccl.northwestern.edu/netlogo/models/HubNetDisease
; for terms of use.
;
; *** End of NetLogo Model Copyright Notice ***
@#$#@#$#@
GRAPHICS-WINDOW
273
94
703
545
10
10
20.0
1
10
1
1
1

CC-WINDOW
273
549
693
632
Command Center

BUTTON
11
10
71
43
Setup
setup-prompt
NIL
1
T
OBSERVER
T

BUTTON
139
10
203
43
Go
go
T
1
T
OBSERVER
T

SLIDER
35
122
230
155
infection-chance
infection-chance
0
100
5
1
1
%

BUTTON
204
10
262
43
Infect
infect-turtles
NIL
1
T
OBSERVER
T

BUTTON
7
215
119
248
Create Androids
create-androids
NIL
1
T
OBSERVER
T

PLOT
14
367
258
564
Number Sick
time
sick
0.0
25.0
0.0
6.0
true
false
PENS
"num-sick1" 1.0 0 -65536 true
"num-sick2" 1.0 0 -16776961 true
"num-sick3" 1.0 0 -65281 true

SLIDER
120
249
267
282
android-delay
android-delay
0.0
10.0
0.8
0.1
1
NIL

SLIDER
120
215
267
248
number
number
1
200
5
1
1
androids

SWITCH
162
169
267
202
show-ill?
show-ill?
0
1
-1000

SWITCH
7
249
119
282
wander?
wander?
0
1
-1000

MONITOR
11
161
69
210
turtles
count turtles
0
1

MONITOR
73
161
160
210
num-infected
current-num-infected
0
1

SLIDER
35
89
230
122
initial-number-sick
initial-number-sick
1
20
1
1
1
NIL

SLIDER
14
334
161
367
data-set
data-set
1
3
1
1
1
NIL

TEXTBOX
13
285
257
332
This slider controls which pen draws the data for the run.  This only has an effect when Re-Run or Setup are pressed.

BUTTON
72
10
134
43
Re-Run
cure-all
NIL
1
T
OBSERVER
T

SWITCH
34
51
231
84
show-ill-on-clients?
show-ill-on-clients?
0
1
-1000

BUTTON
170
334
258
367
Clear Plot
setup-plot
NIL
1
T
OBSERVER
T

BUTTON
273
60
391
93
Reset Instructions
setup-quick-start
NIL
1
T
OBSERVER
T

BUTTON
609
60
693
93
NEXT >>>
view-next
NIL
1
T
OBSERVER
T

BUTTON
532
60
610
93
<<< PREV
view-prev
NIL
1
T
OBSERVER
T

MONITOR
273
10
693
59
Quick Start Instructions- More in Info Window
quick-start
0
1

@#$#@#$#@
WHAT IS IT?
-----------
This model simulates the spread of a disease through a population.  This population can consist of either students, which are turtles controlled by individual students via the HubNet Client, or turtles that are generated and controlled by NetLogo, called androids, or both androids and students.

Turtles move around, possibly catching an infection.  Healthy turtles on the same patch as sick turtles have a PERCENTAGE-INFECTION chance of becoming ill.  A plot shows the number of sick turtles at each time tick, and if SHOW-ILL? is on, sick turtles have a red circle attached to their shape.

Initially, all turtles are healthy.  A number of turtles equal to INITIAL-NUMBER-SICK become ill when the INFECT button is depressed.

This activity uses Disease client.nlogo for the HubNet Client interface.

For further documentation, see the Participatory Simulations Guide found at http://ccl.northwestern.edu/ps/


HOW TO USE IT
-------------
QUICKSTART INSTRUCTIONS:
------------------------
Teacher: Follow these directions to run the HubNet activity.
Optional: Zoom In (see Tools in the Menu Bar)
Optional: Change any of the settings.  If you do change the settings, press the SETUP button.  Press the GO button to start the model.
Everyone: Open up a HubNet Client on your machine and input the IP Address of this computer, type your user name in the user name box and press ENTER.

Teacher: Have the students move their turtles around to acquaint themselves with the interface.  Then press the INFECT NetLogo button to start the simulation.  Watch the plot of the number infected.
    
Teacher: To rerun the activity with the same group, stop the model by pressing the NetLogo GO button, if it is on.  Change any of the settings that you would like.  To overlay the new run's plot data change the value of the slider DATA-SET. If you set DATA-SET to a value that already had data in it, the new data will over-write the old data.  Press the NetLogo RE-RUN button.  Restart the simulation by pressing the NetLogo GO button again.  Infect some turtles and continue.
    
Teacher: To start the simulation over with a new group, stop the model by pressing the NetLogo GO button, if it is on and follow these instructions again from the beginning.

BUTTONS:
--------
SETUP - clears all turtles and patches and the plot.  This should only be pressed when starting out with a new group of users since all data is lost.
GO - runs the simulation
RE-RUN - cures all turtles, and clears the current plot pen selected with DATA-SET.  This should be used to setup the model again for collecting more data or running the model again with the same users connected.
CREATE ANDROIDS - adds randomly moving turtles to the simulation
INFECT - infects some of the turtles in the simulation
NEXT >>> - shows the next quick start instruction
<<< PREVIOUS - shows the previous quick start instruction
RESET INSTRUCTIONS - shows the first quick start instruction

SLIDERS:
--------
NUMBER - determines how many androids are created by the CREATE ANDROIDS button
ANDROID-DELAY - the delay time, in seconds, for android movement - the higher the number, the slower the androids move
INITIAL-NUMBER-SICK - the number of turtles that become infected spontaneously when the INFECT button is pressed
PERCENTAGE-INFECTION - sets the percentage chance that every tenth of a second a healthy turtle will become sick if it is on the same patch as an infected turtle
DATA-SET - sets which plot pen the data from this run will be plotted with.  This is useful for comparing several runs of the model to one another.  All pens are cleared by SETUP.

SWITCHES:
---------
WANDER? - when on, the androids wander randomly.  When off, they sit still
SHOW-ILL? - when on, sick turtles add to their original shape a red circle.  When off, they can move through the populace unnoticed
SHOW-ILL-ON-CLIENTS? - when on, the clients will be told if their turtle is sick or not.

MONITORS:
---------
TURTLES - the number of turtles in the simulation
NUM-INFECTED - the number of turtles that are infected

PLOTS:
------
NUMBER SICK - shows the number of sick turtles versus time


CLIENT INFORMATION
------------------
After logging in, the client interface will appear for the students, and if GO is pressed in NetLogo they will be assigned a turtle which will be described in the YOU ARE A: monitor.  And their current location will be shown in the LOCATED AT: monitor.  If the student doesn't like their assigned shape and/or color they can hit the CHANGE APPEARANCE button at any time to change to another random appearance.

The SICK? monitor will show one of three values: "true" "false" or "N/A".  "N/A" will be shown if the NetLogo SHOW-ILL-ON-CLIENTS? switch is off, otherwise "true" will be shown if your turtle is infected, or "false" will be shown if your turtle is not infected.

The student controls the movement of their turtle with the UP, DOWN, LEFT, and RIGHT buttons and the STEP-SIZE slider.  Clicking any of the directional buttons will cause their turtle to move in the respective direction a distance of STEP-SIZE.

The students can watch the progress of the disease in the NUMBER SICK plot which is identical to the plot of the same name in NetLogo.


THINGS TO NOTICE
----------------
No matter how you change the various parameters, the same basic plot shape emerges.  After using the model once with the students, ask them how they think the plot will change if you alter a parameter.  Altering the initial percentage sick and the percentage infection will have different effects on the plot.


THINGS TO TRY
-------------
Use the model with the entire class to serve as an introduction to the topic.  Then have students use the NetLogo model individually, in a computer lab, to explore the effects of the various parameters.  Discuss what they find, observe, and can conclude from this model.


EXTENDING THE MODEL
-------------------
Currently, the turtles remain sick once they're infected.  How would the shape of the plot change if turtles eventually healed?  If, after healing, they were immune to the disease, or could still spread the disease, how would the dynamics be altered?


CREDITS AND REFERENCES
----------------------
This activity and associated models and materials was created as part of the projects:
PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and INTEGRATED SIMULATION AND MODELING ENVIRONMENT. These projects gratefully acknowledge the support of the National Science Foundation (REPP & ROLE programs) -- grant numbers REC #9814682 and REC-0126227.

Copyright 2002 by Uri Wilensky & Walter Stroup. All rights reserved. 

Permission to use, modify or redistribute this model is hereby granted, provided that both of the following requirements are followed: 
a) this copyright notice is included. 
b) this model will not be redistributed for profit without permission from the copyright holders. 
Contact the copyright holders for appropriate licenses for redistribution for profit. 

To refer to this model in academic publications, please use: Wilensky, U. & Stroup, W. (2002). NetLogo HubNet Disease model. http://ccl.northwestern.edu/netlogo/models/HubNetDisease. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL. 

In other publications, please use: Copyright 2002 by Uri Wilensky and Walter Stroup.  All rights reserved.  See http://ccl.northwestern.edu/netlogo/models/HubNetDisease for terms of use.
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