diff --git a/docs/IMPLEMENTATION.md b/docs/IMPLEMENTATION.md
index 1f5c883..fda7242 100644
--- a/docs/IMPLEMENTATION.md
+++ b/docs/IMPLEMENTATION.md
@@ -46,21 +46,25 @@
 - [X] Implement quote fetching with HTTP client
 - [X] Add basic error handling
 
-## Phase 3: Basic Server Architecture
-- [ ] Set up dependency injection framework (wire/dig)
-- [ ] Create core interfaces and contracts
+## Phase 3: Service Layer Implementation
+**Goal**: Complete service layer with DI for handling requests (untied from TCP presentation)
+
+- [X] Create service layer interfaces and contracts
+- [X] Implement quote request service workflow
+- [X] Integrate PoW challenge generation and verification
+- [X] Set up simple dependency wiring
+- [X] Implement full request-response cycle
+- [X] Add comprehensive service layer tests
+- [X] Add error handling and validation
+- [X] Create public concrete WisdomService type
+- [X] Add workflow tests with real PoW implementations
+- [X] Add unsuccessful flow tests for invalid solutions
+
+## Phase 4: Basic Server Architecture
 - [ ] Set up structured logging (zerolog/logrus)
 - [ ] Set up metrics collection (prometheus)
 - [ ] Create configuration management
-- [ ] Integrate PoW and quote packages into server architecture
-
-## Phase 4: Quote Management System
-- [ ] Define quote storage interface
-- [ ] Implement in-memory quote repository (fake)
-- [ ] Create quote selection service (random)
-- [ ] Load initial quote collection from file/config
-- [ ] Add quote validation and sanitization
-- [ ] Write unit tests for quote management
+- [ ] Integrate all components into server architecture
 
 ## Phase 5: TCP Protocol Implementation
 - [ ] Implement binary message protocol codec