| Web Search Engine and Query Functionalities | Privacy and Usability Challenges |
| 1. Web search engine navigation privacy | Holistic privacy and usability approach to web search navigation using query formation and reformation plus result selection and navigation. |
| 2. Paid and organic search results | Employing paid and organic search results as a measure/indicator of web search query obfuscation. |
| 3. Precision and recall | Using precision, recall, and Page Rank to measure web search query obfuscation and usability. |
| 4. User profile generation | Generation of obfuscated user profile with an acceptable level of search result usability. |
| 5. Web search queries | Privacy and usability approaches to informational, transactional, and navigational queries. |
| 6. Types of search queries | Privacy and usability methods, including hybrids―e.g. Boolean, concept and keyword queries. |
| 7. Semantic search and word sense disambiguation | Privacy and usability approaches to semantic search using statistical, natural language processing, graph theory, and machine learning models. |
| 8. Web search query reformation | How to achieve privacy and usability during web search query reformation. How can a user correct their query without revealing their intent? |
| 9. Temporal queries | How can an acceptable level of usability be achieved with obfuscated temporal queries? |
| 10. Query classification | How to obfuscate user intent with query classification. Methods to obfuscate search queries using both semantics and different classifications. |