diff --git a/lib/channel.rb b/lib/channel.rb
new file mode 100644
index 00000000..5f5b1904
--- /dev/null
+++ b/lib/channel.rb
@@ -0,0 +1,74 @@
+require 'httparty'
+require 'awesome_print'
+require 'dotenv'
+Dotenv.load
+
+class Channel
+  def self.get_channels
+    url = 'https://slack.com/api/channels.list'
+    query_parameters = {
+      token: ENV['SLACK_API_TOKEN']
+    }
+    
+    response = HTTParty.get(url, query: query_parameters).to_s
+    response = JSON.parse(response)
+
+    return response["channels"]
+  end
+  
+  def self.list_channels(channels)
+    channels.each do |channel|
+      puts "Channel name: #{channel["name"]}"
+      puts "Topic: #{channel["topic"]["value"]}"
+      puts "Member Count: #{channel["members"].length}"
+      puts "Slack ID: #{channel["id"]}"
+      puts
+    end
+  end
+
+  def self.select_channel(channels)
+    continue = true
+    selected_channel = nil
+
+    while(continue)
+      ap "Select your channel with one of the following: "
+      puts "a. channel name"
+      puts "b. SlackID"
+      puts "c. quit\n"
+      print "> "
+      select_channel_response = gets.chomp.downcase
+
+      if select_channel_response == "a" || select_channel_response == "channel name"
+        print "\nChannel name > "
+        requested_channel_name = gets.chomp.downcase
+
+        channels.each do |channel|
+          if channel["name"] == requested_channel_name
+            selected_channel = channel
+          end
+        end
+
+        continue = false
+        
+      elsif select_channel_response == "b" || select_channel_response == "slackid"
+        print "\nSlackID > "
+        requested_id = gets.chomp.upcase
+
+        channels.each do |channel|
+          if channel["id"] == requested_id
+            selected_channel = channel
+          end
+        end
+
+        continue = false
+
+      elsif select_channel_response == "c" || select_channel_response == "quit"
+        continue = false
+      else
+        puts "Inaccurate response.\n\n"
+      end
+    end
+
+    return selected_channel
+  end
+end
\ No newline at end of file
diff --git a/lib/recipient.rb b/lib/recipient.rb
new file mode 100644
index 00000000..d80867ed
--- /dev/null
+++ b/lib/recipient.rb
@@ -0,0 +1,55 @@
+require "httparty"
+require "awesome_print"
+require "dotenv"
+Dotenv.load
+
+class Recipient
+  attr_reader :is_user
+
+  def initialize(slack_id, is_user)
+    @slack_id = slack_id
+    @is_user = is_user
+  end
+
+  def self.details(slack_id)
+    if @is_user
+      url = "https://slack.com/api/users.list"
+      query_parameters = {
+        token: ENV["SLACK_API_TOKEN"],
+      }
+
+      response = HTTParty.get(url, query: query_parameters).to_s
+      response = JSON.parse(response)
+
+      users = response["members"]
+
+      users.each do |user|
+        if user["id"] == @slack_id
+          puts "Your selected user has the following details:"
+          puts "Name: #{user["real_name"]}"
+          puts "Username: #{user["name"]}"
+          puts "SlackID: #{user["id"]}"
+        end
+      end
+    else
+      url = "https://slack.com/api/channels.list"
+      query_parameters = {
+        token: ENV["SLACK_API_TOKEN"],
+      }
+
+      response = HTTParty.get(url, query: query_parameters).to_s
+      response = JSON.parse(response)
+      channels = response["channels"]
+
+      channels.each do |channel|
+        if channel["id"] == @slack_id
+          puts "Your selected channel has the following details:"
+          puts "Channel name: #{channel["name"]}"
+          puts "Topic: #{channel["topic"]["value"]}"
+          puts "Member Count: #{channel["members"].length}"
+          puts "Slack ID: #{channel["id"]}"
+        end
+      end
+    end
+  end
+end
diff --git a/lib/slack.rb b/lib/slack.rb
index 960cf2f7..f6e9f166 100755
--- a/lib/slack.rb
+++ b/lib/slack.rb
@@ -1,11 +1,103 @@
 #!/usr/bin/env ruby
+require 'httparty' 
+require 'awesome_print'
+require 'dotenv'
+require_relative '../lib/recipient'
+require_relative '../lib/channel'
+require_relative '../lib/user'
+Dotenv.load
+# require 'table_print'
+
+class SlackApiError < StandardError; end
+
 
 def main
-  puts "Welcome to the Ada Slack CLI!"
+  ap "Welcome to the Ada Slack CLI!"
+
+  def menu
+    puts
+    ap "Main Menu"
+    puts "a. list users"
+    puts "b. select user"
+    puts "c. list channels"
+    puts "d. select channel"
+    puts "e. details for selected user and channel"
+    puts "f. send message"
+    puts "g. quit\n\n"
+
+    ap "What would you like to do?"
+    print "> "
+    @menu_response = gets.chomp.downcase.delete(".")
+    puts
+  end
+
+  users = User.get_users
+  channels = Channel.get_channels
+  recipient = nil
+  continue = true 
 
-  # TODO project
+  puts "There are #{channels.length} channels and #{users.length} users."
 
-  puts "Thank you for using the Ada Slack CLI"
+  while (continue)
+    menu
+    if @menu_response == "a" || @menu_response == "list users"
+      ap "All users in the Slack workspace: "
+      User.list_users(users)
+    elsif @menu_response == "b" || @menu_response == "select user"
+      user = User.select_user(users)
+      if user.nil?
+        puts "Error. User not found."
+      else
+        recipient = Recipient.new(user["id"], true)
+      end
+    elsif @menu_response == "c" || @menu_response == "list channels"
+      ap "All channels in the Slack workspace: "
+      Channel.list_channels(channels)
+    elsif @menu_response == "d" || @menu_response == "select channel"
+      channel = Channel.select_channel(channels)
+      if channel.nil?
+        puts "Error. Channel not found."
+      else
+        recipient = Recipient.new(channel["id"], false)
+      end
+    elsif @menu_response == "e" || @menu_response == "details"
+      if recipient.nil?
+        puts "No details to show, please select a channel or user."
+      else
+        if user.nil?
+          recipient.details(channel["id"])
+        else
+          recipient.details(user["id"])
+        end
+      end
+    elsif @menu_response == "f" || @menu_response == "send message"
+      puts "Okay, you want to send a message."
+      puts "What is the SlackID or name of the channel?"
+      print "> "
+      channel = gets.chomp
+
+      puts "What is the message you want to send?"
+      print "> "
+      text = gets.chomp
+
+      url = 'https://slack.com/api/chat.postMessage'
+      query_parameters = {
+        token: ENV['SLACK_API_TOKEN'],
+        channel: channel,
+        text: text,
+      }
+
+      HTTParty.post(url, query: query_parameters)
+
+    elsif @menu_response == "g" || @menu_response == "quit"
+      ap "Okay, good-bye! Thank you for using the Ada Slack CLI!"
+      continue = false
+    else
+      ap "Invalid input. To quit, choose c."
+      menu
+    end
+  end
 end
 
+
 main if __FILE__ == $PROGRAM_NAME
\ No newline at end of file
diff --git a/lib/user.rb b/lib/user.rb
new file mode 100644
index 00000000..b0172888
--- /dev/null
+++ b/lib/user.rb
@@ -0,0 +1,73 @@
+require 'httparty'
+require 'awesome_print'
+require 'dotenv'
+Dotenv.load
+
+class User
+  def self.get_users
+    url = 'https://slack.com/api/users.list'
+    query_parameters = {
+      token: ENV['SLACK_API_TOKEN']
+    }
+  
+    response = HTTParty.get(url, query: query_parameters).to_s
+    response = JSON.parse(response)
+
+    return response["members"]
+  end
+
+  def self.list_users(users)
+    users.each do |user|
+      puts "Name: #{user["real_name"]}"
+      puts "Username: #{user["name"]}"
+      puts "SlackID: #{user["id"]}"
+      puts
+    end
+  end
+
+  def self.select_user(users)
+    continue = true
+    selected_user = nil
+
+    while(continue)
+      ap "Select your user with one of the following: "
+      puts "a. username"
+      puts "b. SlackID"
+      puts "c. quit\n"
+      print "> "
+      select_user_response = gets.chomp.downcase
+
+      if select_user_response == "a" || select_user_response == "username"
+        print "\nUsername > "
+        requested_username = gets.chomp.downcase
+
+        users.each do |user|
+          if user["name"] == requested_username
+            selected_user = user
+          end
+        end
+        
+        continue = false
+
+      elsif select_user_response == "b" || select_user_response == "slackid"
+        print "\nSlackID > "
+        requested_id = gets.chomp.upcase
+
+        users.each do |user|
+          if user["id"] == requested_id
+            selected_user = user
+          end
+        end
+
+        continue = false
+
+      elsif select_user_response == "c" || select_user_response == "quit"
+        continue = false
+      else
+        puts "Invalid response.\n\n"
+      end
+    end
+
+    return selected_user
+  end
+end
\ No newline at end of file
diff --git a/specs/channel_spec.rb b/specs/channel_spec.rb
new file mode 100644
index 00000000..78bffc58
--- /dev/null
+++ b/specs/channel_spec.rb
@@ -0,0 +1,19 @@
+require "simplecov"
+SimpleCov.start
+
+require_relative "test_helper"
+require_relative "../lib/channel.rb"
+
+describe "Channel class" do
+  before do
+    VCR.use_cassette("channel_list") do
+      @response = Channel.get_channels
+    end
+  end
+
+  it "can retrieve a list of channels" do
+    expect(@response).must_be_kind_of Array
+    expect(@response[0]).must_be_kind_of Hash
+    expect(@response[0]["members"].length).must_be_kind_of Integer
+  end
+end
diff --git a/specs/recipient_spec.rb b/specs/recipient_spec.rb
new file mode 100644
index 00000000..1513c90a
--- /dev/null
+++ b/specs/recipient_spec.rb
@@ -0,0 +1,18 @@
+require "simplecov"
+SimpleCov.start
+
+require_relative "test_helper"
+require_relative "../lib/recipient.rb"
+
+# File always wants to make GET request to channel API regardless of @is_user status.
+# Not sure how to make tests work for this.
+
+# describe "Recipient class" do
+#   before do
+#     @is_user = true
+#   end
+#   it "Can get details about a user" do
+#     slack_id = "USLACKBOT"
+#     expect(Recipient.details(slack_id)).must_be_kind_of Hash
+#   end
+# end
diff --git a/specs/test_helper.rb b/specs/test_helper.rb
index 81ccd06b..c044f8ce 100644
--- a/specs/test_helper.rb
+++ b/specs/test_helper.rb
@@ -1,15 +1,32 @@
-require 'simplecov'
+require "simplecov"
 SimpleCov.start
 
-require 'minitest'
-require 'minitest/autorun'
-require 'minitest/reporters'
-require 'minitest/skip_dsl'
-require 'vcr'
+require "minitest"
+require "minitest/skip_dsl"
+
+require "minitest/autorun"
+require "minitest/reporters"
+require "vcr"
+require "webmock/minitest"
+require "dotenv"
+Dotenv.load
+
+require_relative "../lib/recipient"
+require_relative "../lib/channel"
+require_relative "../lib/user"
+require_relative "../lib/slack"
 
 Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new
 
 VCR.configure do |config|
-  config.cassette_library_dir = "specs/cassettes"
-  config.hook_into :webmock
-end
\ No newline at end of file
+  config.cassette_library_dir = "specs/cassettes" # folder where casettes will be located
+  config.hook_into :webmock # tie into this other tool called webmock
+  config.default_cassette_options = {
+    :record => :new_episodes,    # record new data when we don't have it yet
+    :match_requests_on => [:method, :uri, :body], # The http method, URI and body of a request all need to match
+  }
+  # Don't leave our token lying around in a cassette file.
+  config.filter_sensitive_data("<LOCATIONIQ_TOKEN>") do
+    ENV["LOCATIONIQ_TOKEN"]
+  end
+end
diff --git a/specs/user_spec.rb b/specs/user_spec.rb
new file mode 100644
index 00000000..f3506038
--- /dev/null
+++ b/specs/user_spec.rb
@@ -0,0 +1,18 @@
+require "simplecov"
+SimpleCov.start
+
+require_relative "test_helper"
+require_relative "../lib/user.rb"
+
+describe "User class" do
+  before do
+    VCR.use_cassette("user_list") do
+      @response = User.get_users
+    end
+  end
+
+  it "can retrieve a list of users" do
+    expect(@response).must_be_kind_of Array
+    expect(@response[0]).must_be_kind_of Hash
+  end
+end