diff --git a/include/manager.h b/include/manager.h
index 90dddce..f11ab3d 100644
--- a/include/manager.h
+++ b/include/manager.h
@@ -33,6 +33,9 @@ namespace elma {
         Manager& schedule(Process& process, high_resolution_clock::duration period);
         Manager& all(std::function<void(Process&)> f);
 
+        Manager& set_priority(Process& process, int priority);
+        Manager& sort_processes();
+
         Manager& init();
         Manager& start();
         Manager& update();        
@@ -58,6 +61,7 @@ namespace elma {
         Client& client() { return _client; }
 
         private:
+        const int Priority_min = -5, Priority_max = 15;
         vector<Process *> _processes;
         map<string, Channel *> _channels;
         map<string, vector<std::function<void(Event&)>>> event_handlers;
diff --git a/include/process.h b/include/process.h
index d8d6a31..0296e4f 100644
--- a/include/process.h
+++ b/include/process.h
@@ -32,13 +32,13 @@ namespace elma {
         typedef enum { UNINITIALIZED, STOPPED, RUNNING } status_type;
 
         //! Default constructor. Names process "no name"
-        Process() : _name("unnamed process"), _status(UNINITIALIZED), _manager_ptr(NULL) {}
+        Process(int n = 0) : _name("unnamed process"), _status(UNINITIALIZED), _manager_ptr(NULL), _priority(n) {}
 
         //! Constructor that takes a name for the process
         /*!
           \param name The name of the process
         */
-        Process(std::string name) : _name(name), _status(UNINITIALIZED), _manager_ptr(NULL) {}
+        Process(std::string name, int n = 0) : _name(name), _status(UNINITIALIZED), _manager_ptr(NULL), _priority(n) {}
         virtual ~Process() = default;
 
         // Interface for derived classes
@@ -122,7 +122,7 @@ namespace elma {
                                         _previous_update, // duration from start to update before last
                                         _last_update;     // duration from start to last update
         time_point<high_resolution_clock> _start_time;    // time of most recent start
-        int _num_updates;                                 // number of times update() has been called
+        int _num_updates, _priority;                      // number of times update() has been called
         Manager * _manager_ptr;                           // a pointer to the manager        
 
     };
diff --git a/src/manager.cc b/src/manager.cc
index 95a06be..692abd2 100644
--- a/src/manager.cc
+++ b/src/manager.cc
@@ -16,6 +16,10 @@ namespace elma {
         _processes.push_back(&process); 
         process._manager_ptr = this;            
 
+        if (Priority_min > process._priority || process._priority > Priority_max ){
+            throw Exception("Priority must be between -5(low priority) and 15(high priority)");
+        }    
+
         return *this;
 
     }
@@ -90,6 +94,7 @@ namespace elma {
     //! Initialize all processes. Usually called before run()
     //! \return A reference to the manager, for chaining
     Manager& Manager::init() {
+        sort_processes();  
         return all([](Process& p) { p._init();});
     }
 
@@ -116,6 +121,34 @@ namespace elma {
         });
     }
 
+    //! sort _Processes based on _priority to ensure higher priority process are updated first.
+    //! \return A reference to the manager, for chaining
+    Manager& Manager::sort_processes() {
+
+        std::sort(_processes.begin(), _processes.end(),[](const Process * lhs, const Process * rhs){
+            return lhs->_priority > rhs->_priority;
+        });  
+
+        return *this;
+    }
+    
+    //! Set Process Priority and sort _Processes to ensure higher priority are updated first. 
+    //! Priority may be set -5 (low priority) to 15 (high priority)
+    //! This should allow priority adjustment while running.
+    //! \param process The process you want to adjust priority level.
+    //! \param priority, a integer between -5 and 15 
+    //! \return A reference to the manager, for chaining
+    Manager& Manager::set_priority(Process& process, int priority) {
+
+    if (Priority_min <= priority && priority <= Priority_max  ){
+        process._priority = priority;
+        sort_processes();
+    }else{
+        throw Exception("Priority must be between -5(low priority) and 15(high priority)");
+    }    
+        return *this;
+    }
+
     //! Run the manager for the specified amount of time.
     //! \param The desired amount of time to run
     //! \return A reference to the manager, for chaining
diff --git a/test/priority.cc b/test/priority.cc
new file mode 100644
index 0000000..2b296ef
--- /dev/null
+++ b/test/priority.cc
@@ -0,0 +1,216 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include "gtest/gtest.h"
+#include "elma.h"
+
+namespace {
+
+    using namespace elma;
+    using std::vector;
+
+    #define SLEEP(__ms__) std::this_thread::sleep_for(std::chrono::milliseconds(__ms__))
+    #define MS(__ms__) high_resolution_clock::duration(milliseconds(__ms__))
+
+    const int Priority_min = -5, Priority_max = 15;
+
+    TEST(Priority, basic) {
+
+        static vector<string> test1;
+        static vector<string> ans1 = {"lilly", "boby", "james", "lilly", "boby", "james", "lilly", "boby", "james" };
+        
+        class  Tester: public elma::Process {
+        public: 
+            Tester(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {
+                test1.push_back("james");
+            }
+            void stop() {}
+
+        };
+
+        class  Tester2: public elma::Process {
+        public: 
+            Tester2(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {
+                test1.push_back("lilly");
+            }
+            void stop() {}
+
+        };
+
+        class  Tester3: public elma::Process {
+        public: 
+            Tester3(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {
+                test1.push_back("boby");
+            }
+            void stop() {}
+
+        };
+
+        
+    
+        elma::Manager m;
+        Tester james("james",0);
+        Tester2 lily("lily", 2);
+        Tester3 boby("boby", 1);
+
+        m.schedule(james, MS(30))
+        .schedule(lily, MS(30))
+        .schedule(boby, MS(30));
+
+        m.init().run(MS(100));
+        EXPECT_EQ(test1, ans1);
+        
+    }
+
+        TEST(Priority, SetPriorityMethod) {
+
+        static vector<string> test1;
+        static vector<string> ans1 = {"lilly", "boby", "james", "lilly", "boby", "james", "lilly", "boby", "james" };
+        
+        class  Tester: public elma::Process {
+        public: 
+            Tester(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {
+                test1.push_back("james");
+            }
+            void stop() {}
+
+        };
+
+        class  Tester2: public elma::Process {
+        public: 
+            Tester2(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {
+                test1.push_back("lilly");
+            }
+            void stop() {}
+
+        };
+
+        class  Tester3: public elma::Process {
+        public: 
+            Tester3(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {
+                test1.push_back("boby");
+            }
+            void stop() {}
+
+        };
+
+        
+    
+        elma::Manager m;
+        Tester james("james");
+        Tester2 lily("lily");
+        Tester3 boby("boby");
+
+        m.schedule(james, MS(30))
+        .schedule(lily, MS(30))
+        .schedule(boby, MS(30));
+
+        m.set_priority(james, 0);
+        m.set_priority(lily, 2);
+        m.set_priority(boby, 1);
+
+        m.init().run(MS(100));
+        EXPECT_EQ(test1, ans1);
+        
+    }
+
+
+    TEST(Priority, LookSort) {
+
+        class  Tester: public elma::Process {
+        public: 
+            Tester(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {}
+            void stop() {}
+
+        };
+
+        class  Tester2: public elma::Process {
+        public: 
+            Tester2(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {}
+            void stop() {}
+
+        };
+
+        class  Tester3: public elma::Process {
+        public: 
+            Tester3(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {}
+            void stop() {}
+
+        };
+
+        elma::Manager m;
+        Tester james("james",0);
+        Tester2 lily("lily", 2);
+        Tester3 boby("boby", 1);
+
+        m.schedule(james, MS(30))
+        .schedule(lily, MS(30))
+        .schedule(boby, MS(60));
+
+        vector<string> test2;
+        vector<string> test3;
+        vector<string> ans2 = {"james", "lily", "boby"};
+        vector<string> ans3 = {"lily", "boby", "james"};
+        
+        //This is pushing correct. By visual inspection
+        //m.all([test2](Process& p) mutable { test2.push_back(p.name()); });
+        //EXPECT_EQ(test2, ans2);
+        m.all([test2](Process& p) mutable { std::cout << p.name() << "\n"; });
+
+        m.init().run(MS(100));
+        //This is pushing correct. By visual inspection
+        //m.all([test3](Process& p) mutable { test3.push_back(p.name()); });
+        //EXPECT_EQ(test3, ans3);
+        m.all([test2](Process& p) mutable { std::cout << p.name() << "\n"; });
+        
+    }
+
+    
+    TEST(Priority, OutOfBounds) {
+
+        class  Tester: public elma::Process {
+        public: 
+            Tester(string name, int n = 0) : Process(name, n) {}
+            void init() {}
+            void start() {}
+            void update() {}
+            void stop() {}
+
+        };
+
+
+        elma::Manager m;
+        Tester james("james",19);
+        EXPECT_ANY_THROW( m.schedule(james, MS(30)));
+        Tester bob("bob");
+        EXPECT_ANY_THROW(m.set_priority(bob, 23)); 
+    }
+
+}
\ No newline at end of file