diff --git a/.github/workflows/e-navigator.yml b/.github/workflows/ruby-on-rails--e-navigator.yml
similarity index 77%
rename from .github/workflows/e-navigator.yml
rename to .github/workflows/ruby-on-rails--e-navigator.yml
index f1245b38..07f97c10 100644
--- a/.github/workflows/e-navigator.yml
+++ b/.github/workflows/ruby-on-rails--e-navigator.yml
@@ -5,7 +5,7 @@
 # This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
 # For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
 
-name: e-Navigator
+name: Ruby on Rails - e-Navigator
 
 on:
   push:
@@ -21,9 +21,9 @@ on:
       - ruby-on-rails/e-navigator/Rakefile
       - ruby-on-rails/e-navigator/.rubocop.yml
       - ruby-on-rails/e-navigator/.rubocop_todo.yml
-      # - ruby-on-rails/e-navigator/Steepfile
+      - ruby-on-rails/e-navigator/Steepfile
       - ruby-on-rails/e-navigator/**/*.rb
-      # - ruby-on-rails/e-navigator/**/*.rbs
+      - ruby-on-rails/e-navigator/**/*.rbs
       - ruby-on-rails/e-navigator/**/*.rake
       - ruby-on-rails/e-navigator/**/*.yml
       - ruby-on-rails/e-navigator/**/*.js
@@ -41,9 +41,9 @@ on:
       - ruby-on-rails/e-navigator/Rakefile
       - ruby-on-rails/e-navigator/.rubocop.yml
       - ruby-on-rails/e-navigator/.rubocop_todo.yml
-      # - ruby-on-rails/e-navigator/Steepfile
+      - ruby-on-rails/e-navigator/Steepfile
       - ruby-on-rails/e-navigator/**/*.rb
-      # - ruby-on-rails/e-navigator/**/*.rbs
+      - ruby-on-rails/e-navigator/**/*.rbs
       - ruby-on-rails/e-navigator/**/*.rake
       - ruby-on-rails/e-navigator/**/*.yml
       - ruby-on-rails/e-navigator/**/*.js
@@ -61,7 +61,7 @@ jobs:
     outputs:
       ruby-changes: ${{ steps.change-detection.outputs.ruby }}
       rubocop-changes: ${{ steps.change-detection.outputs.rubocop}}
-      # steep-changes: ${{ steps.change-detection.outputs.steep}}
+      steep-changes: ${{ steps.change-detection.outputs.steep}}
     steps:
       - uses: actions/checkout@v6
       - name: Change Detection
@@ -96,18 +96,18 @@ jobs:
               - ruby-on-rails/e-navigator/.rubocop_todo.yml
               - ruby-on-rails/e-navigator/**/*.rb
               - ruby-on-rails/e-navigator/**/*.rake
-            # steep:
-              # - .github/actions/setup-ruby-on-rails/action.yml
-              # - .github/workflows/e-navigator.yml
-              # - .ruby-version
-              # - ruby-on-rails/e-navigator/.ruby-version
-              # - ruby-on-rails/e-navigator/Gemfile
-              # - ruby-on-rails/e-navigator/Gemfile.lock
-              # - ruby-on-rails/e-navigator/Rakefile
-              # - ruby-on-rails/e-navigator/Steepfile
-              # - ruby-on-rails/e-navigator/**/*.rb
-              # - ruby-on-rails/e-navigator/**/*.rbs
-              # - ruby-on-rails/e-navigator/**/*.rake
+            steep:
+              - .github/actions/setup-ruby-on-rails/action.yml
+              - .github/workflows/e-navigator.yml
+              - .ruby-version
+              - ruby-on-rails/e-navigator/.ruby-version
+              - ruby-on-rails/e-navigator/Gemfile
+              - ruby-on-rails/e-navigator/Gemfile.lock
+              - ruby-on-rails/e-navigator/Rakefile
+              - ruby-on-rails/e-navigator/Steepfile
+              - ruby-on-rails/e-navigator/**/*.rb
+              - ruby-on-rails/e-navigator/**/*.rbs
+              - ruby-on-rails/e-navigator/**/*.rake
   minitest:
     timeout-minutes: 10
     runs-on: ubuntu-latest
@@ -150,19 +150,19 @@ jobs:
       - name: RuboCop
         working-directory: ./ruby-on-rails/e-navigator
         run: bundle exec rubocop
-  # steep:
-  #   timeout-minutes: 10
-  #   runs-on: ubuntu-latest
-  #   needs: change-detection
-  #   if: needs.change-detection.outputs.steep-changes == 'true'
-  #   steps:
-  #     - uses: actions/checkout@v6
-  #     - uses: ./.github/actions/setup-ruby-on-rails
-  #       with:
-  #         working-directory: ./ruby-on-rails/e-navigator
-  #         job-name: steep
-  #     - name: Steep
-  #       working-directory: ./ruby-on-rails/e-navigator
-  #       run: |
-  #         bundle exec rbs-inline --output sig/generated/ .
-  #         bundle exec steep check
+  steep:
+    timeout-minutes: 10
+    runs-on: ubuntu-latest
+    needs: change-detection
+    if: needs.change-detection.outputs.steep-changes == 'true'
+    steps:
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup-ruby-on-rails
+        with:
+          working-directory: ./ruby-on-rails/e-navigator
+          job-name: steep
+      - name: Steep
+        working-directory: ./ruby-on-rails/e-navigator
+        run: |
+          bundle exec rbs-inline --output sig/generated/ .
+          bundle exec steep check
diff --git a/.gitignore b/.gitignore
index 4d1d766c..e40eb293 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,31 +1,4 @@
 # Ruby on Rails
-## Perfect Ruby on Rails
-ruby-on-rails/perfect-ruby-on-rails/.bundle
-ruby-on-rails/perfect-ruby-on-rails/.pnpm-store
-ruby-on-rails/perfect-ruby-on-rails/log/*
-ruby-on-rails/perfect-ruby-on-rails/tmp/*
-!ruby-on-rails/perfect-ruby-on-rails/log/.keep
-!ruby-on-rails/perfect-ruby-on-rails/tmp/.keep
-ruby-on-rails/perfect-ruby-on-rails/tmp/pids/*
-!ruby-on-rails/perfect-ruby-on-rails/tmp/pids/
-!ruby-on-rails/perfect-ruby-on-rails/tmp/pids/.keep
-ruby-on-rails/perfect-ruby-on-rails/storage/*
-!ruby-on-rails/perfect-ruby-on-rails/storage/.keep
-ruby-on-rails/perfect-ruby-on-rails/public/assets/
-ruby-on-rails/perfect-ruby-on-rails/public/packs/
-ruby-on-rails/perfect-ruby-on-rails/.byebug_history
-ruby-on-rails/perfect-ruby-on-rails/config/master.key
-ruby-on-rails/perfect-ruby-on-rails/app/assets/builds/*
-!ruby-on-rails/perfect-ruby-on-rails/app/assets/builds/.keep
-ruby-on-rails/perfect-ruby-on-rails/node_modules/
-ruby-on-rails/perfect-ruby-on-rails/.env
-
-## RESTful API
-ruby-on-rails/restful-api/config/master.key
-ruby-on-rails/restful-api/tmp/*
-ruby-on-rails/restful-api/log/*
-ruby-on-rails/restful-api/.bundle
-ruby-on-rails/restful-api/.env
 
 ## e-Navigator
 ruby-on-rails/e-navigator/*.DS_Store
@@ -103,6 +76,36 @@ ruby-on-rails/e-navigator/doc/
 ruby-on-rails/e-navigator/rdoc/
 ruby-on-rails/e-navigator/.bundle/
 ruby-on-rails/e-navigator/lib/bundler/man/
+ruby-on-rails/e-navigator/sig/
+ruby-on-rails/e-navigator/vendor/
+
+## Perfect Ruby on Rails
+ruby-on-rails/perfect-ruby-on-rails/.bundle
+ruby-on-rails/perfect-ruby-on-rails/.pnpm-store
+ruby-on-rails/perfect-ruby-on-rails/log/*
+ruby-on-rails/perfect-ruby-on-rails/tmp/*
+!ruby-on-rails/perfect-ruby-on-rails/log/.keep
+!ruby-on-rails/perfect-ruby-on-rails/tmp/.keep
+ruby-on-rails/perfect-ruby-on-rails/tmp/pids/*
+!ruby-on-rails/perfect-ruby-on-rails/tmp/pids/
+!ruby-on-rails/perfect-ruby-on-rails/tmp/pids/.keep
+ruby-on-rails/perfect-ruby-on-rails/storage/*
+!ruby-on-rails/perfect-ruby-on-rails/storage/.keep
+ruby-on-rails/perfect-ruby-on-rails/public/assets/
+ruby-on-rails/perfect-ruby-on-rails/public/packs/
+ruby-on-rails/perfect-ruby-on-rails/.byebug_history
+ruby-on-rails/perfect-ruby-on-rails/config/master.key
+ruby-on-rails/perfect-ruby-on-rails/app/assets/builds/*
+!ruby-on-rails/perfect-ruby-on-rails/app/assets/builds/.keep
+ruby-on-rails/perfect-ruby-on-rails/node_modules/
+ruby-on-rails/perfect-ruby-on-rails/.env
+
+## RESTful API
+ruby-on-rails/restful-api/config/master.key
+ruby-on-rails/restful-api/tmp/*
+ruby-on-rails/restful-api/log/*
+ruby-on-rails/restful-api/.bundle
+ruby-on-rails/restful-api/.env
 
 # Python
 python/**/__pycache__/
diff --git a/README.md b/README.md
index 5d4a7b78..7405c155 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 [![Actions Status: JavaScript](https://github.com/hayat01sh1da/tutorials/workflows/JavaScript/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22JavaScript%22)
 [![Actions Status: Python](https://github.com/hayat01sh1da/tutorials/workflows/Python/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22Python%22)
-[![Actions Status: e-Navigator](https://github.com/hayat01sh1da/tutorials/workflows/e-Navigator/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22e-Navigator%22)
-[![Actions Status: Perfect Ruby on Rails](https://github.com/hayat01sh1da/tutorials/workflows/Perfect%20Ruby%20on%20Rails/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22Perfect%20Ruby%20on%20Rails%22)
-[![Actions Status: RESTful API](https://github.com/hayat01sh1da/tutorials/workflows/RESTful%20API/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22RESTful%20API%22)
+[![Actions Status: Ruby on Rails - e-Navigator](https://github.com/hayat01sh1da/tutorials/workflows/Ruby%20on%20Rails%20-%20e-Navigator/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22Ruby%20on%20Rails%20-%20e-Navigator%22)
+[![Actions Status: Ruby on Rails - Perfect Ruby on Rails](https://github.com/hayat01sh1da/tutorials/workflows/Ruby%20on%20Rails%20-%20Perfect%20Ruby%20on%20Rails/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22Ruby%20on%20Rails%20-%20Perfect%20Ruby%20on%20Rails%22)
+[![Actions Status: Ruby on Rails - RESTful API](https://github.com/hayat01sh1da/tutorials/workflows/Ruby%20on%20Rails%20-%20RESTful%20API/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22Ruby%20on%20Rails%20-%20RESTful%20API%22)
 [![Actions Status: TypeScript](https://github.com/hayat01sh1da/tutorials/workflows/TypeScript/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22TypeScript%22)
 [![Actions Status: CodeQL](https://github.com/hayat01sh1da/tutorials/workflows/CodeQL/badge.svg)](https://github.com/hayat01sh1da/tutorials/actions?query=workflow%3A%22CodeQL%22)
 
diff --git a/ruby-on-rails/e-navigator/Gemfile b/ruby-on-rails/e-navigator/Gemfile
index bb6039b1..ebbb1a11 100644
--- a/ruby-on-rails/e-navigator/Gemfile
+++ b/ruby-on-rails/e-navigator/Gemfile
@@ -29,6 +29,11 @@ gem 'dotenv-rails', '~> 3.2.0'
 gem 'bootsnap', '~> 1.24.1', require: false
 
 group :development, :test do
+  # Debug tool used with binding.irb. Explicit require avoids eager loading `debug/prelude`
+  # which interferes with the Docker boot process.
+  # [Ref] https://ruby.github.io/irb/#label-Debugging+with+IRB
+  # [Ref] https://github.com/ruby/debug#debug-command-on-the-debug-console
+  # [Ref] https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem 'debug', platforms: %i[ mri windows ], require: false
 end
 
@@ -42,7 +47,9 @@ group :development do
   gem 'rubocop-minitest', '~> 0.39.0', require: false
   gem 'rubocop-performance', '~> 1.26.0', require: false
   gem 'rubocop-rails', '~> 2.34.3', require: false
-
+  # Typechecking
+  gem 'rbs-inline', '~> 0.13.0', require: false
+  gem 'steep', '~> 1.10.0', require: false
   # Provides methods for benchmarking Ruby code, giving detailed reports on the time taken for each task
   gem 'benchmark', '~> 0.5.0'
 end
diff --git a/ruby-on-rails/e-navigator/Gemfile.lock b/ruby-on-rails/e-navigator/Gemfile.lock
index 1858d54f..a5811aa7 100644
--- a/ruby-on-rails/e-navigator/Gemfile.lock
+++ b/ruby-on-rails/e-navigator/Gemfile.lock
@@ -100,6 +100,7 @@ GEM
     concurrent-ruby (1.3.6)
     connection_pool (3.0.2)
     crass (1.0.6)
+    csv (3.3.5)
     date (3.5.1)
     debug (1.11.1)
       irb (~> 1.10)
@@ -124,6 +125,8 @@ GEM
     factory_bot_rails (6.5.1)
       factory_bot (~> 6.5)
       railties (>= 6.1.0)
+    ffi (1.17.4-x86_64-linux-gnu)
+    fileutils (1.8.0)
     globalid (1.3.0)
       activesupport (>= 6.1)
     i18n (1.14.8)
@@ -144,6 +147,10 @@ GEM
     json (2.19.5)
     language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
+    listen (3.10.0)
+      logger
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.7.0)
     loofah (2.25.1)
       crass (~> 1.0.2)
@@ -161,6 +168,7 @@ GEM
       drb (~> 2.0)
       prism (~> 1.5)
     msgpack (1.8.0)
+    mutex_m (0.3.0)
     mysql2 (0.5.7)
       bigdecimal
     net-imap (0.6.4)
@@ -239,6 +247,15 @@ GEM
       zeitwerk (~> 2.6)
     rainbow (3.1.1)
     rake (13.4.2)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
+      ffi (~> 1.0)
+    rbs (3.10.4)
+      logger
+      tsort
+    rbs-inline (0.13.0)
+      prism (>= 0.29)
+      rbs (>= 3.8.0)
     rdoc (7.2.0)
       erb
       psych (>= 4.0.0)
@@ -287,7 +304,27 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 4.0)
       websocket (~> 1.0)
+    steep (1.10.0)
+      activesupport (>= 5.1)
+      concurrent-ruby (>= 1.1.10)
+      csv (>= 3.0.9)
+      fileutils (>= 1.1.0)
+      json (>= 2.1.0)
+      language_server-protocol (>= 3.17.0.4, < 4.0)
+      listen (~> 3.0)
+      logger (>= 1.3.0)
+      mutex_m (>= 0.3.0)
+      parser (>= 3.1)
+      rainbow (>= 2.2.2, < 4.0)
+      rbs (~> 3.9)
+      securerandom (>= 0.1)
+      strscan (>= 1.0.0)
+      terminal-table (>= 2, < 5)
+      uri (>= 0.12.0)
     stringio (3.2.0)
+    strscan (3.1.8)
+    terminal-table (4.0.0)
+      unicode-display_width (>= 1.1.1, < 4)
     thor (1.5.0)
     timeout (0.6.1)
     tsort (0.2.0)
@@ -338,11 +375,13 @@ DEPENDENCIES
   puma (~> 8.0.1)
   rails (~> 8.1.3)
   rails-controller-testing (~> 1.0.5)
+  rbs-inline (~> 0.13.0)
   rubocop (~> 1.86.1)
   rubocop-minitest (~> 0.39.0)
   rubocop-performance (~> 1.26.0)
   rubocop-rails (~> 2.34.3)
   selenium-webdriver (~> 4.43.0)
+  steep (~> 1.10.0)
   turbo-rails (~> 2.0.16)
   tzinfo-data
   web-console (~> 4.3.0)
@@ -374,6 +413,7 @@ CHECKSUMS
   concurrent-ruby (1.3.6) sha256=6b56837e1e7e5292f9864f34b69c5a2cbc75c0cf5338f1ce9903d10fa762d5ab
   connection_pool (3.0.2) sha256=33fff5ba71a12d2aa26cb72b1db8bba2a1a01823559fb01d29eb74c286e62e0a
   crass (1.0.6) sha256=dc516022a56e7b3b156099abc81b6d2b08ea1ed12676ac7a5657617f012bd45d
+  csv (3.3.5) sha256=6e5134ac3383ef728b7f02725d9872934f523cb40b961479f69cf3afa6c8e73f
   date (3.5.1) sha256=750d06384d7b9c15d562c76291407d89e368dda4d4fff957eb94962d325a0dc0
   debug (1.11.1) sha256=2e0b0ac6119f2207a6f8ac7d4a73ca8eb4e440f64da0a3136c30343146e952b6
   devise (5.0.4) sha256=d605f2b85854e74e56ee789e2d398702bc2d06e6bcd894717a670a3199c74cc1
@@ -385,6 +425,8 @@ CHECKSUMS
   erubi (1.13.1) sha256=a082103b0885dbc5ecf1172fede897f9ebdb745a4b97a5e8dc63953db1ee4ad9
   factory_bot (6.5.6) sha256=12beb373214dccc086a7a63763d6718c49769d5606f0501e0a4442676917e077
   factory_bot_rails (6.5.1) sha256=d3cc4851eae4dea8a665ec4a4516895045e710554d2b5ac9e68b94d351bc6d68
+  ffi (1.17.4-x86_64-linux-gnu) sha256=9d3db14c2eae074b382fa9c083fe95aec6e0a1451da249eab096c34002bc752d
+  fileutils (1.8.0) sha256=8c6b1df54e2540bdb2f39258f08af78853aa70bad52b4d394bbc6424593c6e02
   globalid (1.3.0) sha256=05c639ad6eb4594522a0b07983022f04aa7254626ab69445a0e493aa3786ff11
   i18n (1.14.8) sha256=285778639134865c5e0f6269e0b818256017e8cde89993fdfcbfb64d088824a5
   importmap-rails (2.2.3) sha256=7101be2a4dc97cf1558fb8f573a718404c5f6bcfe94f304bf1f39e444feeb16a
@@ -394,6 +436,7 @@ CHECKSUMS
   json (2.19.5) sha256=218a18553e4801d579ca7e0f5bc72bafd776d7397238a1fb4e74db5b0a812c59
   language_server-protocol (3.17.0.5) sha256=fd1e39a51a28bf3eec959379985a72e296e9f9acfce46f6a79d31ca8760803cc
   lint_roller (1.1.0) sha256=2c0c845b632a7d172cb849cc90c1bce937a28c5c8ccccb50dfd46a485003cc87
+  listen (3.10.0) sha256=c6e182db62143aeccc2e1960033bebe7445309c7272061979bb098d03760c9d2
   logger (1.7.0) sha256=196edec7cc44b66cfb40f9755ce11b392f21f7967696af15d274dde7edff0203
   loofah (2.25.1) sha256=d436c73dbd0c1147b16c4a41db097942d217303e1f7728704b37e4df9f6d2e04
   mail (2.9.0) sha256=6fa6673ecd71c60c2d996260f9ee3dd387d4673b8169b502134659ece6d34941
@@ -402,6 +445,7 @@ CHECKSUMS
   mini_mime (1.1.5) sha256=8681b7e2e4215f2a159f9400b5816d85e9d8c6c6b491e96a12797e798f8bccef
   minitest (6.0.6) sha256=153ea36d1d987a62942382b61075745042a2b3123b1cd48f4c3675af9cc7d6f1
   msgpack (1.8.0) sha256=e64ce0212000d016809f5048b48eb3a65ffb169db22238fb4b72472fecb2d732
+  mutex_m (0.3.0) sha256=cfcb04ac16b69c4813777022fdceda24e9f798e48092a2b817eb4c0a782b0751
   mysql2 (0.5.7) sha256=ba09ede515a0ae8a7192040a1b778c0fb0f025fa5877e9be895cd325fa5e9d7b
   net-imap (0.6.4) sha256=9a5598c67a3022c284d98430ef1d4948e7dbdb62596f61081ea8ca933270a02b
   net-pop (0.1.2) sha256=848b4e982013c15b2f0382792268763b748cce91c9e91e36b0f27ed26420dff3
@@ -431,6 +475,10 @@ CHECKSUMS
   railties (8.1.3) sha256=913eb0e0cb520aac687ffd74916bd726d48fa21f47833c6292576ef6a286de22
   rainbow (3.1.1) sha256=039491aa3a89f42efa1d6dec2fc4e62ede96eb6acd95e52f1ad581182b79bc6a
   rake (13.4.2) sha256=cb825b2bd5f1f8e91ca37bddb4b9aaf345551b4731da62949be002fa89283701
+  rb-fsevent (0.11.2) sha256=43900b972e7301d6570f64b850a5aa67833ee7d87b458ee92805d56b7318aefe
+  rb-inotify (0.11.1) sha256=a0a700441239b0ff18eb65e3866236cd78613d6b9f78fea1f9ac47a85e47be6e
+  rbs (3.10.4) sha256=b17d7c4be4bb31a11a3b529830f0aa206a807ca42f2e7921a3027dfc6b7e5ce8
+  rbs-inline (0.13.0) sha256=aba6e48c2d1b75276e8557376164f4b4ba96dd0204e779a5cee2af442bd30442
   rdoc (7.2.0) sha256=8650f76cd4009c3b54955eb5d7e3a075c60a57276766ebf36f9085e8c9f23192
   regexp_parser (2.12.0) sha256=35a916a1d63190ab5c9009457136ae5f3c0c7512d60291d0d1378ba18ce08ebb
   reline (0.6.3) sha256=1198b04973565b36ec0f11542ab3f5cfeeec34823f4e54cebde90968092b1835
@@ -445,7 +493,10 @@ CHECKSUMS
   rubyzip (3.3.0) sha256=a372fc67892a4f8c0bc8ec906b720353d8e48807a64b2e63adf99b1e3583a034
   securerandom (0.4.1) sha256=cc5193d414a4341b6e225f0cb4446aceca8e50d5e1888743fac16987638ea0b1
   selenium-webdriver (4.43.0) sha256=a634377b964b701c6ac0a009ce3a08fa34ec1e1e7fe9a6d57e3088d14529a65c
+  steep (1.10.0) sha256=1b295b55f9aaff1b8d3ee42453ee55bc2a1078fda0268f288edb2dc014f4d7d1
   stringio (3.2.0) sha256=c37cb2e58b4ffbd33fe5cd948c05934af997b36e0b6ca6fdf43afa234cf222e1
+  strscan (3.1.8) sha256=aae2db611a225559f21ffbb71765c9a4e60fd262534a9ea84f4f11c7f32f679e
+  terminal-table (4.0.0) sha256=f504793203f8251b2ea7c7068333053f0beeea26093ec9962e62ea79f94301d2
   thor (1.5.0) sha256=e3a9e55fe857e44859ce104a84675ab6e8cd59c650a49106a05f55f136425e73
   timeout (0.6.1) sha256=78f57368a7e7bbadec56971f78a3f5ecbcfb59b7fcbb0a3ed6ddc08a5094accb
   tsort (0.2.0) sha256=9650a793f6859a43b6641671278f79cfead60ac714148aabe4e3f0060480089f
diff --git a/ruby-on-rails/e-navigator/Steepfile b/ruby-on-rails/e-navigator/Steepfile
new file mode 100644
index 00000000..9fd64fa0
--- /dev/null
+++ b/ruby-on-rails/e-navigator/Steepfile
@@ -0,0 +1,11 @@
+D = Steep::Diagnostic
+
+target :app do
+  check "app"
+  check "test"
+  signature "sig"
+
+  library "minitest"
+
+  configure_code_diagnostics(D::Ruby.default)
+end
diff --git a/ruby-on-rails/e-navigator/app/controllers/application_controller.rb b/ruby-on-rails/e-navigator/app/controllers/application_controller.rb
index 822ebeb6..5bfaaaf2 100644
--- a/ruby-on-rails/e-navigator/app/controllers/application_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/application_controller.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class ApplicationController < ActionController::Base
   before_action :configure_permitted_parameters, if: :devise_controller?
   before_action :authenticate_user!
diff --git a/ruby-on-rails/e-navigator/app/controllers/interviews_controller.rb b/ruby-on-rails/e-navigator/app/controllers/interviews_controller.rb
index b3bcd03d..01003c4f 100644
--- a/ruby-on-rails/e-navigator/app/controllers/interviews_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/interviews_controller.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class InterviewsController < ApplicationController
   before_action :set_user, only: [:index, :new, :create, :select_approver]
   before_action :set_interview, only: [:edit, :update, :destroy, :approve]
diff --git a/ruby-on-rails/e-navigator/app/controllers/users/confirmations_controller.rb b/ruby-on-rails/e-navigator/app/controllers/users/confirmations_controller.rb
index fa535c0a..df8b4a5f 100644
--- a/ruby-on-rails/e-navigator/app/controllers/users/confirmations_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/users/confirmations_controller.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class Users::ConfirmationsController < Devise::ConfirmationsController
   # GET /resource/confirmation/new
diff --git a/ruby-on-rails/e-navigator/app/controllers/users/omniauth_callbacks_controller.rb b/ruby-on-rails/e-navigator/app/controllers/users/omniauth_callbacks_controller.rb
index 565c6ed2..39a241c6 100644
--- a/ruby-on-rails/e-navigator/app/controllers/users/omniauth_callbacks_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/users/omniauth_callbacks_controller.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
   # You should configure your model like this:
diff --git a/ruby-on-rails/e-navigator/app/controllers/users/passwords_controller.rb b/ruby-on-rails/e-navigator/app/controllers/users/passwords_controller.rb
index 1475feec..58650ac5 100644
--- a/ruby-on-rails/e-navigator/app/controllers/users/passwords_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/users/passwords_controller.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class Users::PasswordsController < Devise::PasswordsController
   # GET /resource/password/new
diff --git a/ruby-on-rails/e-navigator/app/controllers/users/registrations_controller.rb b/ruby-on-rails/e-navigator/app/controllers/users/registrations_controller.rb
index 1ee7273e..56e19774 100644
--- a/ruby-on-rails/e-navigator/app/controllers/users/registrations_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/users/registrations_controller.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class Users::RegistrationsController < Devise::RegistrationsController
   # before_action :configure_sign_up_params, only: [:create]
diff --git a/ruby-on-rails/e-navigator/app/controllers/users/sessions_controller.rb b/ruby-on-rails/e-navigator/app/controllers/users/sessions_controller.rb
index 3fcf6a32..54a64da1 100644
--- a/ruby-on-rails/e-navigator/app/controllers/users/sessions_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/users/sessions_controller.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class Users::SessionsController < Devise::SessionsController
   # before_action :configure_sign_in_params, only: [:create]
diff --git a/ruby-on-rails/e-navigator/app/controllers/users/unlocks_controller.rb b/ruby-on-rails/e-navigator/app/controllers/users/unlocks_controller.rb
index 2c410dc0..65ea82b6 100644
--- a/ruby-on-rails/e-navigator/app/controllers/users/unlocks_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/users/unlocks_controller.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# rbs_inline: enabled
 
 class Users::UnlocksController < Devise::UnlocksController
   # GET /resource/unlock/new
diff --git a/ruby-on-rails/e-navigator/app/controllers/users_controller.rb b/ruby-on-rails/e-navigator/app/controllers/users_controller.rb
index b6fcdce2..73aa907e 100644
--- a/ruby-on-rails/e-navigator/app/controllers/users_controller.rb
+++ b/ruby-on-rails/e-navigator/app/controllers/users_controller.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class UsersController < ApplicationController
   # GET /users
   def index
diff --git a/ruby-on-rails/e-navigator/app/helpers/application_helper.rb b/ruby-on-rails/e-navigator/app/helpers/application_helper.rb
index 4fe8129b..14a7476d 100644
--- a/ruby-on-rails/e-navigator/app/helpers/application_helper.rb
+++ b/ruby-on-rails/e-navigator/app/helpers/application_helper.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 module ApplicationHelper
 
   def devise_mapping
diff --git a/ruby-on-rails/e-navigator/app/helpers/home_helper.rb b/ruby-on-rails/e-navigator/app/helpers/home_helper.rb
index 23de56ac..9d10be11 100644
--- a/ruby-on-rails/e-navigator/app/helpers/home_helper.rb
+++ b/ruby-on-rails/e-navigator/app/helpers/home_helper.rb
@@ -1,2 +1,4 @@
+# rbs_inline: enabled
+
 module HomeHelper
 end
diff --git a/ruby-on-rails/e-navigator/app/helpers/interviews_helper.rb b/ruby-on-rails/e-navigator/app/helpers/interviews_helper.rb
index 9820ca3a..b6743370 100644
--- a/ruby-on-rails/e-navigator/app/helpers/interviews_helper.rb
+++ b/ruby-on-rails/e-navigator/app/helpers/interviews_helper.rb
@@ -1,2 +1,4 @@
+# rbs_inline: enabled
+
 module InterviewsHelper
 end
diff --git a/ruby-on-rails/e-navigator/app/jobs/application_job.rb b/ruby-on-rails/e-navigator/app/jobs/application_job.rb
index a009ace5..159e3e7c 100644
--- a/ruby-on-rails/e-navigator/app/jobs/application_job.rb
+++ b/ruby-on-rails/e-navigator/app/jobs/application_job.rb
@@ -1,2 +1,4 @@
+# rbs_inline: enabled
+
 class ApplicationJob < ActiveJob::Base
 end
diff --git a/ruby-on-rails/e-navigator/app/mailers/application_mailer.rb b/ruby-on-rails/e-navigator/app/mailers/application_mailer.rb
index 6ba1d0dd..d600319c 100644
--- a/ruby-on-rails/e-navigator/app/mailers/application_mailer.rb
+++ b/ruby-on-rails/e-navigator/app/mailers/application_mailer.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class ApplicationMailer < ActionMailer::Base
   default from: 'reminder@example.com'
   layout 'mailer'
diff --git a/ruby-on-rails/e-navigator/app/mailers/interview_mailer.rb b/ruby-on-rails/e-navigator/app/mailers/interview_mailer.rb
index 1d58b44f..e91aea26 100644
--- a/ruby-on-rails/e-navigator/app/mailers/interview_mailer.rb
+++ b/ruby-on-rails/e-navigator/app/mailers/interview_mailer.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class InterviewMailer < ApplicationMailer
   helper ApplicationHelper
 
diff --git a/ruby-on-rails/e-navigator/app/models/application_record.rb b/ruby-on-rails/e-navigator/app/models/application_record.rb
index 71a1a03c..d9f3bc09 100644
--- a/ruby-on-rails/e-navigator/app/models/application_record.rb
+++ b/ruby-on-rails/e-navigator/app/models/application_record.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 end
\ No newline at end of file
diff --git a/ruby-on-rails/e-navigator/app/models/interview.rb b/ruby-on-rails/e-navigator/app/models/interview.rb
index 96b4afb5..fdbc4de9 100644
--- a/ruby-on-rails/e-navigator/app/models/interview.rb
+++ b/ruby-on-rails/e-navigator/app/models/interview.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class Interview < ApplicationRecord
   belongs_to :user
   validates :user_id, presence: true
diff --git a/ruby-on-rails/e-navigator/app/models/user.rb b/ruby-on-rails/e-navigator/app/models/user.rb
index 090bdafb..85d52060 100644
--- a/ruby-on-rails/e-navigator/app/models/user.rb
+++ b/ruby-on-rails/e-navigator/app/models/user.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 class User < ApplicationRecord
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable and :omniauthable
diff --git a/ruby-on-rails/e-navigator/test/controllers/application_controller_test.rb b/ruby-on-rails/e-navigator/test/controllers/application_controller_test.rb
index f98f4b51..d17b328f 100644
--- a/ruby-on-rails/e-navigator/test/controllers/application_controller_test.rb
+++ b/ruby-on-rails/e-navigator/test/controllers/application_controller_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class ApplicationControllerTest < ActionDispatch::IntegrationTest
diff --git a/ruby-on-rails/e-navigator/test/controllers/interviews_controller_test.rb b/ruby-on-rails/e-navigator/test/controllers/interviews_controller_test.rb
index 58d158ed..fa13b841 100644
--- a/ruby-on-rails/e-navigator/test/controllers/interviews_controller_test.rb
+++ b/ruby-on-rails/e-navigator/test/controllers/interviews_controller_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class InterviewsControllerTest < ActionDispatch::IntegrationTest
diff --git a/ruby-on-rails/e-navigator/test/controllers/users_controller_test.rb b/ruby-on-rails/e-navigator/test/controllers/users_controller_test.rb
index 861f0dc6..f9043373 100644
--- a/ruby-on-rails/e-navigator/test/controllers/users_controller_test.rb
+++ b/ruby-on-rails/e-navigator/test/controllers/users_controller_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class UsersControllerTest < ActionDispatch::IntegrationTest
diff --git a/ruby-on-rails/e-navigator/test/helpers/application_helper_test.rb b/ruby-on-rails/e-navigator/test/helpers/application_helper_test.rb
index 4bcf997d..25d38ce8 100644
--- a/ruby-on-rails/e-navigator/test/helpers/application_helper_test.rb
+++ b/ruby-on-rails/e-navigator/test/helpers/application_helper_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class ApplicationHelperTest < ActionView::TestCase
diff --git a/ruby-on-rails/e-navigator/test/integration/interview_flow_test.rb b/ruby-on-rails/e-navigator/test/integration/interview_flow_test.rb
index 9d6d1e22..2ea29dc5 100644
--- a/ruby-on-rails/e-navigator/test/integration/interview_flow_test.rb
+++ b/ruby-on-rails/e-navigator/test/integration/interview_flow_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class InterviewFlowTest < ActionDispatch::IntegrationTest
diff --git a/ruby-on-rails/e-navigator/test/integration/user_flow_test.rb b/ruby-on-rails/e-navigator/test/integration/user_flow_test.rb
index b0aeb3b1..ba8ea740 100644
--- a/ruby-on-rails/e-navigator/test/integration/user_flow_test.rb
+++ b/ruby-on-rails/e-navigator/test/integration/user_flow_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class UserFlowTest < ActionDispatch::IntegrationTest
diff --git a/ruby-on-rails/e-navigator/test/jobs/application_job_test.rb b/ruby-on-rails/e-navigator/test/jobs/application_job_test.rb
index aaceac1c..41fd84c5 100644
--- a/ruby-on-rails/e-navigator/test/jobs/application_job_test.rb
+++ b/ruby-on-rails/e-navigator/test/jobs/application_job_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class ApplicationJobTest < ActiveJob::TestCase
diff --git a/ruby-on-rails/e-navigator/test/mailers/application_mailer_test.rb b/ruby-on-rails/e-navigator/test/mailers/application_mailer_test.rb
index 057fa62c..193a1a4e 100644
--- a/ruby-on-rails/e-navigator/test/mailers/application_mailer_test.rb
+++ b/ruby-on-rails/e-navigator/test/mailers/application_mailer_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class ApplicationMailerTest < ActionMailer::TestCase
diff --git a/ruby-on-rails/e-navigator/test/mailers/interview_mailer_test.rb b/ruby-on-rails/e-navigator/test/mailers/interview_mailer_test.rb
index f136594c..e0b35697 100644
--- a/ruby-on-rails/e-navigator/test/mailers/interview_mailer_test.rb
+++ b/ruby-on-rails/e-navigator/test/mailers/interview_mailer_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class InterviewMailerTest < ActionMailer::TestCase
diff --git a/ruby-on-rails/e-navigator/test/models/application_record_test.rb b/ruby-on-rails/e-navigator/test/models/application_record_test.rb
index 68773c64..eb9018b0 100644
--- a/ruby-on-rails/e-navigator/test/models/application_record_test.rb
+++ b/ruby-on-rails/e-navigator/test/models/application_record_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class ApplicationRecordTest < ActiveSupport::TestCase
diff --git a/ruby-on-rails/e-navigator/test/models/interview_test.rb b/ruby-on-rails/e-navigator/test/models/interview_test.rb
index eedf3d35..1f18dc23 100644
--- a/ruby-on-rails/e-navigator/test/models/interview_test.rb
+++ b/ruby-on-rails/e-navigator/test/models/interview_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class InterviewTest < ActiveSupport::TestCase
diff --git a/ruby-on-rails/e-navigator/test/models/user_test.rb b/ruby-on-rails/e-navigator/test/models/user_test.rb
index 7c13d542..210aa37b 100644
--- a/ruby-on-rails/e-navigator/test/models/user_test.rb
+++ b/ruby-on-rails/e-navigator/test/models/user_test.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 require 'test_helper'
 
 class UserTest < ActiveSupport::TestCase
diff --git a/ruby-on-rails/e-navigator/test/test_helper.rb b/ruby-on-rails/e-navigator/test/test_helper.rb
index a5483e86..3e0ded9d 100644
--- a/ruby-on-rails/e-navigator/test/test_helper.rb
+++ b/ruby-on-rails/e-navigator/test/test_helper.rb
@@ -1,3 +1,5 @@
+# rbs_inline: enabled
+
 ENV['RAILS_ENV'] ||= 'test'
 require_relative '../config/environment'
 require 'rails/test_help'