diff --git a/demos/MMk.rb b/demos/MMk.rb
index ab18c074c9d170bf5e8812334200caabfe37235e..90b37062778ebf886e8c22c0c3615ba3ff1b5619 100644
--- a/demos/MMk.rb
+++ b/demos/MMk.rb
@@ -9,52 +9,51 @@ class MMk
   include SimpleKit
 
   # Constructor - initializes the model parameters.
-  # param: arrivalRate - The rate at which customers arrive to the system.
-  # param: serviceRate - The rate at which individual servers serve.
-  # param: maxServers - The total number of servers in the system.
-  def initialize(arrivalRate, serviceRate, maxServers)
-    @arrivalRate = arrivalRate
-    @serviceRate = serviceRate
-    @maxServers = maxServers
+  # param: arrival_rate - The rate at which customers arrive to the system.
+  # param: service_rate - The rate at which individual servers serve.
+  # param: max_servers - The total number of servers in the system.
+  def initialize(arrival_rate, service_rate, max_servers)
+    @arrival_rate = arrival_rate
+    @service_rate = service_rate
+    @max_servers = max_servers
   end
 
   # Initialize the model state and schedule any necessary events.
   # Note that this particular model will terminate based on
   # time by scheduling a halt 100 time units in the future.
   def init
-    @numAvailableServers = @maxServers
-    @qLength = 0
+    @num_available_servers = @max_servers
+    @q_length = 0
     schedule(:arrival, 0.0)
     schedule(:halt, 100.0)
-    dumpState("init")
+    dump_state('init')
   end
 
-
   # An arrival event increments the queue length, schedules the next
-  # arrival, and schedules a beginService event if a server is available.
+  # arrival, and schedules a begin_service event if a server is available.
   def arrival
-    @qLength += 1
-    schedule(:arrival, exponential(@arrivalRate))
-    schedule(:beginService, 0.0) if (@numAvailableServers > 0)
-    dumpState("Arrival")
+    @q_length += 1
+    schedule(:arrival, exponential(@arrival_rate))
+    schedule(:begin_service, 0.0) if @num_available_servers > 0
+    dump_state('arrival')
   end
 
   # Start service for the first customer in line, removing that
   # customer from the queue and utilizing one of the available servers.
-  # An endService will be scheduled.
-  def beginService
-    @qLength -= 1
-    @numAvailableServers -= 1
-    schedule(:endService, exponential(@serviceRate))
-    dumpState("Begin Svc")
+  # An end_service will be scheduled.
+  def begin_service
+    @q_length -= 1
+    @num_available_servers -= 1
+    schedule(:end_service, exponential(@service_rate))
+    dump_state('begin svc')
   end
 
-  # Frees up an available server, and schedules a beginService if
+  # Frees up an available server, and schedules a begin_service if
   # anybody is waiting in line.
-  def endService
-    @numAvailableServers += 1
-    schedule(:beginService, 0.0) if (@qLength > 0)
-    dumpState("End Svc")
+  def end_service
+    @num_available_servers += 1
+    schedule(:begin_service, 0.0) if @q_length > 0
+    dump_state('end svc')
   end
 
   # Exponential random variate generator.
@@ -67,13 +66,12 @@ class MMk
   # A report mechanism which dumps the time, current event, and values
   # of the state variables to the console.
   # param: event - The name of the event which invoked this method.
-  def dumpState(event)
+  def dump_state(event)
     printf "Time: %8.3f\t%10s - Q: %d\tServers Available: %d\n",
-	    model_time, event, @qLength, @numAvailableServers
+           model_time, event, @q_length, @num_available_servers
   end
-
 end
 
 # Instantiate an MMk object with a particular parameterization and run it.
-srand 7654321 
+srand 7_654_321
 MMk.new(4.5, 1.0, 5).run