diff --git a/src/components/ToolMatrix.astro b/src/components/ToolMatrix.astro
index 9edd5ec..88367f8 100644
--- a/src/components/ToolMatrix.astro
+++ b/src/components/ToolMatrix.astro
@@ -139,12 +139,14 @@ domains.forEach((domain: any) => {
   </div>
 </div>
 
-<!-- Tool Details Modal stays the same -->
-<div class="modal-overlay" id="modal-overlay" onclick="window.hideToolDetails()"></div>
-<div class="tool-details" id="tool-details">
+<!-- Tool Details Modals - Dual Modal System -->
+<div class="modal-overlay" id="modal-overlay" onclick="window.hideAllToolDetails()"></div>
+
+<!-- Primary Modal -->
+<div class="tool-details" id="tool-details-primary">
   <div style="display: flex; justify-content: space-between; align-items: start; margin-bottom: 1rem;">
-    <h2 id="tool-name" style="margin: 0;">Tool Name</h2>
-    <button class="btn-icon" onclick="window.hideToolDetails()">
+    <h2 id="tool-name-primary" style="margin: 0;">Tool Name</h2>
+    <button class="btn-icon" onclick="window.hideToolDetails('primary')">
       <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
         <line x1="18" y1="6" x2="6" y2="18"></line>
         <line x1="6" y1="6" x2="18" y2="18"></line>
@@ -152,15 +154,38 @@ domains.forEach((domain: any) => {
     </button>
   </div>
   
-  <p id="tool-description" class="text-muted"></p>
+  <p id="tool-description-primary" class="text-muted"></p>
   
-  <div id="tool-badges" style="display: flex; gap: 0.5rem; margin-bottom: 1rem;"></div>
+  <div id="tool-badges-primary" style="display: flex; gap: 0.5rem; margin-bottom: 1rem;"></div>
   
-  <div id="tool-metadata" style="margin-bottom: 1rem;"></div>
+  <div id="tool-metadata-primary" style="margin-bottom: 1rem;"></div>
   
-  <div id="tool-tags" style="margin-bottom: 1rem;"></div>
+  <div id="tool-tags-primary" style="margin-bottom: 1rem;"></div>
   
-  <div id="tool-links" style="display: flex; gap: 0.5rem; flex-direction: column;"></div>
+  <div id="tool-links-primary" style="display: flex; gap: 0.5rem; flex-direction: column;"></div>
+</div>
+
+<!-- Secondary Modal -->
+<div class="tool-details" id="tool-details-secondary">
+  <div style="display: flex; justify-content: space-between; align-items: start; margin-bottom: 1rem;">
+    <h2 id="tool-name-secondary" style="margin: 0;">Tool Name</h2>
+    <button class="btn-icon" onclick="window.hideToolDetails('secondary')">
+      <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+        <line x1="18" y1="6" x2="6" y2="18"></line>
+        <line x1="6" y1="6" x2="18" y2="18"></line>
+      </svg>
+    </button>
+  </div>
+  
+  <p id="tool-description-secondary" class="text-muted"></p>
+  
+  <div id="tool-badges-secondary" style="display: flex; gap: 0.5rem; margin-bottom: 1rem;"></div>
+  
+  <div id="tool-metadata-secondary" style="margin-bottom: 1rem;"></div>
+  
+  <div id="tool-tags-secondary" style="margin-bottom: 1rem;"></div>
+  
+  <div id="tool-links-secondary" style="display: flex; gap: 0.5rem; flex-direction: column;"></div>
 </div>
 
 <script define:vars={{ toolsData: tools, domainAgnosticSoftware, domainAgnosticTools }}>
@@ -244,68 +269,131 @@ domains.forEach((domain: any) => {
   // Make functions globally available
   window.toggleDomainAgnosticSection = toggleDomainAgnosticSection;
 
-  // Tool details functions (unchanged)
-  window.showToolDetails = function(toolName) {
+  // Enhanced modal system for side-by-side display
+  window.showToolDetails = function(toolName, modalType = 'primary') {
     const tool = toolsData.find(t => t.name === toolName);
-    if (!tool) return;
+    if (!tool) {
+      console.error('Tool not found:', toolName);
+      return;
+    }
     
     const isMethod = tool.type === 'method';
+    const isConcept = tool.type === 'concept';
+    
+    // Get modal-specific element IDs
+    const elements = {
+      name: document.getElementById(`tool-name-${modalType}`),
+      description: document.getElementById(`tool-description-${modalType}`),
+      badges: document.getElementById(`tool-badges-${modalType}`),
+      metadata: document.getElementById(`tool-metadata-${modalType}`),
+      tags: document.getElementById(`tool-tags-${modalType}`),
+      links: document.getElementById(`tool-links-${modalType}`)
+    };
+    
+    // Check if all elements exist
+    for (const [key, element] of Object.entries(elements)) {
+      if (!element) {
+        console.error(`Element not found: tool-${key}-${modalType}`);
+        return;
+      }
+    }
     
     // Update modal content
-    const toolNameElement = document.getElementById('tool-name');
     const iconHtml = tool.icon ? `<span style="margin-right: 0.75rem; font-size: 1.5rem;">${tool.icon}</span>` : '';
-    toolNameElement.innerHTML = `${iconHtml}${tool.name}`;
-    document.getElementById('tool-description').textContent = tool.description;
+    elements.name.innerHTML = `${iconHtml}${tool.name}`;
+    elements.description.textContent = tool.description;
 
-    // Badges - Only CC24-Server and Knowledgebase
-    const badgesContainer = document.getElementById('tool-badges');
+    // Badges
     const hasValidProjectUrl = tool.projectUrl !== undefined && 
                               tool.projectUrl !== null && 
                               tool.projectUrl !== "" && 
                               tool.projectUrl.trim() !== "";
 
-    badgesContainer.innerHTML = '';
-    // Only show CC24-Server and Knowledgebase badges
-    if (!isMethod && hasValidProjectUrl) {
-      badgesContainer.innerHTML += '<span class="badge badge-primary">CC24-Server</span>';
-    }
-    if (tool.knowledgebase === true) {
-      badgesContainer.innerHTML += '<span class="badge badge-error">📖</span>';
+    elements.badges.innerHTML = '';
+    if (isConcept) {
+      elements.badges.innerHTML += '<span class="badge" style="background-color: var(--color-concept); color: white;">Konzept</span>';
+    } else if (isMethod) {
+      elements.badges.innerHTML += '<span class="badge" style="background-color: var(--color-method); color: white;">Methode</span>';
+    } else if (hasValidProjectUrl) {
+      elements.badges.innerHTML += '<span class="badge badge-primary">CC24-Server</span>';
     }
     
-    // Metadata - safe array handling
-    const metadataContainer = document.getElementById('tool-metadata');
+    if (tool.knowledgebase === true) {
+      elements.badges.innerHTML += '<span class="badge badge-error">📖</span>';
+    }
+    
+    // Metadata
     const domains = tool.domains || [];
     const phases = tool.phases || [];
     const domainsText = domains.length > 0 ? domains.join(', ') : 'Domain-agnostic';
     const phasesText = phases.join(', ');
-    metadataContainer.innerHTML = `
-      <div style="display: grid; gap: 0.5rem;">
+    
+    let metadataHTML = `<div style="display: grid; gap: 0.5rem;">`;
+    
+    if (!isConcept) {
+      metadataHTML += `
         <div><strong>Betriebssystem:</strong> ${(tool.platforms || []).join(', ')}</div>
         <div><strong>Skill Level:</strong> ${tool.skillLevel}</div>
         <div><strong>Lizenzmodell:</strong> ${tool.license}</div>
         <div><strong>Deployment:</strong> ${tool.accessType}</div>
-        <div><strong>Einsatzgebiete:</strong> ${domainsText}</div>
-        <div><strong>Ermittlungsphasen:</strong> ${phasesText}</div>
-      </div>
-    `;
+      `;
+    } else {
+      metadataHTML += `<div><strong>Skill Level:</strong> ${tool.skillLevel}</div>`;
+    }
     
-    // Tags - safe array handling
-    const tagsContainer = document.getElementById('tool-tags');
+    metadataHTML += `
+      <div><strong>Einsatzgebiete:</strong> ${domainsText}</div>
+      <div><strong>Ermittlungsphasen:</strong> ${phasesText}</div>
+    </div>`;
+    
+    elements.metadata.innerHTML = metadataHTML;
+    
+    // Tags and Related Concepts
     const tags = tool.tags || [];
-    tagsContainer.innerHTML = `
+    let tagsHTML = `
       <div style="display: flex; flex-wrap: wrap; gap: 0.25rem;">
         ${tags.map(tag => `<span class="tag">${tag}</span>`).join('')}
       </div>
     `;
     
-    // Links
-    const linksContainer = document.getElementById('tool-links');
+    // Related Concepts section - only show in primary modal to avoid infinite loops
+    const relatedConcepts = tool.related_concepts || [];
+    if (relatedConcepts.length > 0 && modalType === 'primary') {
+      const conceptLinks = relatedConcepts.map(conceptName => {
+        const concept = toolsData.find(t => t.name === conceptName && t.type === 'concept');
+        if (concept) {
+          return `<button class="tag" style="cursor: pointer; background-color: var(--color-concept-bg); border: 1px solid var(--color-concept); color: var(--color-concept); transition: var(--transition-fast); margin: 0.125rem;" 
+                    onclick="event.stopPropagation(); window.showToolDetails('${conceptName}', 'secondary')" 
+                    onmouseover="this.style.backgroundColor='var(--color-concept)'; this.style.color='white';"
+                    onmouseout="this.style.backgroundColor='var(--color-concept-bg)'; this.style.color='var(--color-concept)';">
+                    ${conceptName}
+                  </button>`;
+        }
+        return `<span class="tag" style="background-color: var(--color-bg-tertiary); color: var(--color-text-secondary); margin: 0.125rem;">${conceptName}</span>`;
+      }).join('');
 
+      tagsHTML += `
+        <div style="margin-top: 1rem;">
+          <strong style="display: block; margin-bottom: 0.5rem; color: var(--color-text);">Verwandte Konzepte:</strong>
+          <div style="display: flex; flex-wrap: wrap; gap: 0.25rem;">
+            ${conceptLinks}
+          </div>
+        </div>
+      `;
+    }
+    
+    elements.tags.innerHTML = tagsHTML;
+    
+    // Links
     let linksHTML = '';
 
-    if (isMethod) {
-      // For methods, show link to the method description/documentation
+    if (isConcept) {
+      linksHTML += `
+        <a href="${tool.url}" target="_blank" rel="noopener noreferrer" class="btn btn-primary" style="width: 100%; background-color: var(--color-concept); border-color: var(--color-concept);">
+          Mehr erfahren
+        </a>
+      `;
+    } else if (isMethod) {
       linksHTML += `
         <a href="${tool.projectUrl || tool.url}" target="_blank" rel="noopener noreferrer" class="btn btn-primary" style="width: 100%; background-color: var(--color-method); border-color: var(--color-method);">
           Zur Methode
@@ -315,7 +403,7 @@ domains.forEach((domain: any) => {
       linksHTML += `
         <div style="display: flex; gap: 0.5rem;">
           <a href="${tool.url}" target="_blank" rel="noopener noreferrer" class="btn btn-secondary" style="flex: 1;">
-            Software-Homepage
+            Homepage
           </a>
           <a href="${tool.projectUrl}" target="_blank" rel="noopener noreferrer" class="btn btn-primary" style="flex: 1;">
             Zugreifen
@@ -346,19 +434,60 @@ domains.forEach((domain: any) => {
       `;
     }
     
-    linksContainer.innerHTML = linksHTML;
+    elements.links.innerHTML = linksHTML;
     
-    // Show modal
-    document.getElementById('modal-overlay').classList.add('active');
-    document.getElementById('tool-details').classList.add('active');
-  };
-  
-  window.hideToolDetails = function() {
-    document.getElementById('modal-overlay').classList.remove('active');
-    document.getElementById('tool-details').classList.remove('active');
+    // Show modals and update layout
+    const overlay = document.getElementById('modal-overlay');
+    const primaryModal = document.getElementById('tool-details-primary');
+    const secondaryModal = document.getElementById('tool-details-secondary');
+    
+    if (overlay) overlay.classList.add('active');
+    if (modalType === 'primary' && primaryModal) primaryModal.classList.add('active');
+    if (modalType === 'secondary' && secondaryModal) secondaryModal.classList.add('active');
+    
+    // Check if both modals are now active
+    const primaryActive = primaryModal && primaryModal.classList.contains('active');
+    const secondaryActive = secondaryModal && secondaryModal.classList.contains('active');
+    
+    if (primaryActive && secondaryActive) {
+      document.body.classList.add('modals-side-by-side');
+    }
   };
 
-  // Listen for view changes to trigger highlighting
+  window.hideToolDetails = function(modalType = 'both') {
+    const overlay = document.getElementById('modal-overlay');
+    const primaryModal = document.getElementById('tool-details-primary');
+    const secondaryModal = document.getElementById('tool-details-secondary');
+    
+    if (modalType === 'both' || modalType === 'all') {
+      if (primaryModal) primaryModal.classList.remove('active');
+      if (secondaryModal) secondaryModal.classList.remove('active');
+      if (overlay) overlay.classList.remove('active');
+      document.body.classList.remove('modals-side-by-side');
+    } else if (modalType === 'primary' && primaryModal) {
+      primaryModal.classList.remove('active');
+    } else if (modalType === 'secondary' && secondaryModal) {
+      secondaryModal.classList.remove('active');
+    }
+    
+    // Check if any modal is still active
+    const primaryActive = primaryModal && primaryModal.classList.contains('active');
+    const secondaryActive = secondaryModal && secondaryModal.classList.contains('active');
+    
+    if (!primaryActive && !secondaryActive) {
+      if (overlay) overlay.classList.remove('active');
+      document.body.classList.remove('modals-side-by-side');
+    } else if (primaryActive !== secondaryActive) {
+      // Only one modal left - remove side-by-side layout
+      document.body.classList.remove('modals-side-by-side');
+    }
+  };
+
+  window.hideAllToolDetails = function() {
+    window.hideToolDetails('both');
+  };
+
+  // Keep existing event listeners
   window.addEventListener('viewChanged', (event) => {
     const view = event.detail;
     if (view === 'matrix') {
@@ -366,7 +495,6 @@ domains.forEach((domain: any) => {
     }
   });
 
-  // Listen for filter changes to update highlighting
   window.addEventListener('toolsFiltered', (event) => {
     const currentView = document.querySelector('.view-toggle.active')?.getAttribute('data-view');
     if (currentView === 'matrix') {
@@ -374,7 +502,6 @@ domains.forEach((domain: any) => {
     }
   });
 
-  // Update matrix on filter change
   window.addEventListener('toolsFiltered', (event) => {
     const filtered = event.detail;
     const currentView = document.querySelector('.view-toggle.active')?.getAttribute('data-view');
@@ -382,33 +509,24 @@ domains.forEach((domain: any) => {
     if (currentView === 'matrix') {
       const selectedPhase = getSelectedPhase();
       
-      // Get all domain-agnostic phase IDs
       const domainAgnosticPhaseIds = domainAgnosticSoftware.map(section => section.id);
-      
-      // Check if selected phase is a domain-agnostic phase
       const isDomainAgnosticPhase = domainAgnosticPhaseIds.includes(selectedPhase);
       
-      // Handle domain-agnostic sections
       domainAgnosticSoftware.forEach(sectionData => {
         const section = document.getElementById(`domain-agnostic-section-${sectionData.id}`);
         const container = document.getElementById(`domain-agnostic-tools-${sectionData.id}`);
         
         if (!section || !container) return;
-        
       });
       
       if (!isDomainAgnosticPhase) {
-        // Show matrix for regular phases
         document.getElementById('dfir-matrix-section').style.display = 'block';
         
-        // Clear and update matrix cells with ALL tools (based on domains × phases)
         document.querySelectorAll('.matrix-cell').forEach(cell => {
           cell.innerHTML = '';
         });
         
-        // Re-populate with filtered tools based on domains × phases
         filtered.forEach(tool => {
-          // Skip concepts - they don't belong in matrix
           if (tool.type === 'concept') {
             return;
           }
@@ -428,8 +546,8 @@ domains.forEach((domain: any) => {
               if (cell) {
                 const chip = document.createElement('span');
                 const chipClass = isMethod ? 'tool-chip-method' : 
-                                 hasValidProjectUrl ? 'tool-chip-hosted' : 
-                                 tool.license !== 'Proprietary' ? 'tool-chip-oss' : '';
+                                hasValidProjectUrl ? 'tool-chip-hosted' : 
+                                tool.license !== 'Proprietary' ? 'tool-chip-oss' : '';
                 chip.className = `tool-chip ${chipClass}`;
                 chip.setAttribute('title', `${tool.name}${tool.knowledgebase === true ? ' (KB verfügbar)' : ''}`);
                 chip.innerHTML = `${tool.name}${tool.knowledgebase === true ? '<span style="margin-left: 0.25rem; font-size: 0.6875rem;">📖</span>' : ''}`;
diff --git a/src/data/tools.yaml b/src/data/tools.yaml
index 8838e17..8578501 100644
--- a/src/data/tools.yaml
+++ b/src/data/tools.yaml
@@ -21,6 +21,9 @@ tools:
     platforms:
       - Windows
       - Linux
+    related_concepts:
+      - "SQL Query Fundamentals"
+      - "Hash Functions & Digital Signatures"
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -58,6 +61,9 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts:
+      - "Hash Functions & Digital Signatures"
+      - "Regular Expressions (Regex)"
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: download
@@ -92,6 +98,7 @@ tools:
       - reporting
     platforms:
       - Web
+    related_concepts: null
     domain-agnostic-software:
       - collaboration-general
     skillLevel: intermediate
@@ -162,6 +169,9 @@ tools:
       - reporting
     platforms:
       - Web
+    related_concepts:
+      - "Regular Expressions (Regex)"
+      - "SQL Query Fundamentals"
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: server-based
@@ -200,6 +210,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -236,6 +247,7 @@ tools:
       - reporting
     platforms:
       - Windows
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: commercial
@@ -269,6 +281,7 @@ tools:
       - analysis
     platforms:
       - Windows
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: commercial
@@ -302,6 +315,7 @@ tools:
     platforms:
       - Linux
       - Web
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: server-based
@@ -335,6 +349,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: expert
     accessType: download
@@ -371,6 +386,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -404,6 +420,7 @@ tools:
       - analysis
     platforms:
       - Web
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: server-based
@@ -444,6 +461,7 @@ tools:
       - Linux
       - macOS
       - Web
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: server-based
@@ -482,6 +500,7 @@ tools:
       - Linux
       - macOS
       - Web
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: server-based
@@ -517,6 +536,7 @@ tools:
       - analysis
     platforms:
       - Linux
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: expert
     accessType: server-based
@@ -551,6 +571,7 @@ tools:
     platforms:
       - Windows
       - Linux
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: download
@@ -587,6 +608,8 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: 
+      - "Regular Expressions (Regex)"
     domain-agnostic-software: null
     skillLevel: novice
     accessType: download
@@ -619,6 +642,7 @@ tools:
       - reporting
     platforms:
       - Web
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: commercial
@@ -657,6 +681,8 @@ tools:
       - Linux
       - macOS
       - Web
+    related_concepts:
+      - "SQL Query Fundamentals"
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: server-based
@@ -692,6 +718,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -728,6 +755,7 @@ tools:
       - reporting
     platforms:
       - Web
+    related_concepts: null
     domain-agnostic-software:
       - collaboration-general
     skillLevel: novice
@@ -760,6 +788,7 @@ tools:
       - reporting
     platforms:
       - Web
+    related_concepts: null
     domain-agnostic-software:
       - collaboration-general
     skillLevel: beginner
@@ -794,6 +823,7 @@ tools:
     platforms:
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: download
@@ -834,6 +864,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software:
       - collaboration-general
     skillLevel: novice
@@ -888,6 +919,7 @@ tools:
     accessType: commercial
     license: Proprietary
     knowledgebase: false
+    related_concepts: null
     domain-agnostic-software:
       - collaboration-general
   - name: GraphSense
@@ -908,6 +940,7 @@ tools:
       - reporting
     platforms:
       - Web
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: server-based
@@ -939,6 +972,8 @@ tools:
       - data-collection
     platforms:
       - Windows
+    related_concepts:
+      - "Hash Functions & Digital Signatures"
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: download
@@ -969,6 +1004,8 @@ tools:
       - data-collection
     platforms:
       - Linux
+    related_concepts:
+      - "Hash Functions & Digital Signatures"
     domain-agnostic-software: null
     skillLevel: novice
     accessType: download
@@ -999,6 +1036,7 @@ tools:
       - data-collection
     platforms:
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1033,6 +1071,8 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts:
+      - "SQL Query Fundamentals"
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1067,6 +1107,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1100,6 +1141,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1146,6 +1188,7 @@ tools:
     accessType: download
     license: GPL-3.0
     knowledgebase: true
+    related_concepts: null
     domain-agnostic-software:
       - specific-os
   - name: dd
@@ -1165,6 +1208,7 @@ tools:
     platforms:
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: built-in
@@ -1195,6 +1239,8 @@ tools:
       - data-collection
     platforms:
       - Linux
+    related_concepts:
+      - "Hash Functions & Digital Signatures"
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1226,6 +1272,7 @@ tools:
     platforms:
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1259,6 +1306,7 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: download
@@ -1290,6 +1338,7 @@ tools:
       - examination
     platforms:
       - Linux
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: download
@@ -1320,6 +1369,7 @@ tools:
       - examination
     platforms:
       - Windows
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: download
@@ -1352,6 +1402,7 @@ tools:
       - analysis
     platforms:
       - Windows
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: beginner
     accessType: download
@@ -1385,6 +1436,7 @@ tools:
     platforms:
       - Windows
       - Linux
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1427,6 +1479,9 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts:
+      - "Regular Expressions (Regex)"
+      - "Hash Functions & Digital Signatures" 
     accessType: download
     license: BSD-3-Clause
     knowledgebase: false
@@ -1448,6 +1503,8 @@ tools:
       - Windows
       - Linux
       - macOS
+    related_concepts:
+      - "Regular Expressions (Regex)"
     domain-agnostic-software: null
     skillLevel: novice
     accessType: built-in
@@ -1522,6 +1579,7 @@ tools:
     accessType: download
     license: Free / Mixed
     knowledgebase: false
+    related_concepts: null
     domain-agnostic-software:
       - specific-os
   - name: Tsurugi Linux
@@ -1553,6 +1611,7 @@ tools:
     accessType: download
     license: GPL / Mixed
     knowledgebase: false
+    related_concepts: null
     domain-agnostic-software:
       - specific-os
   - name: Parrot Security OS
@@ -1583,6 +1642,7 @@ tools:
     accessType: download
     license: GPL-3.0
     knowledgebase: false
+    related_concepts: null
     domain-agnostic-software:
       - specific-os
   - name: Eric Zimmerman Tools
@@ -1601,6 +1661,7 @@ tools:
       - analysis
     platforms:
       - Windows
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1635,6 +1696,7 @@ tools:
       - Linux
       - Windows
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: download
@@ -1668,6 +1730,7 @@ tools:
       - analysis
     platforms:
       - Web
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: expert
     accessType: commercial
@@ -1699,6 +1762,7 @@ tools:
       - analysis
     platforms:
       - Windows
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: expert
     accessType: commercial
@@ -1731,6 +1795,7 @@ tools:
       - reporting
     platforms:
       - Windows
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: commercial
@@ -1761,6 +1826,7 @@ tools:
       - data-collection
     platforms:
       - Hardware
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: commercial
@@ -1818,6 +1884,7 @@ tools:
     phases:
       - data-collection
     platforms: []
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: null
@@ -1852,6 +1919,7 @@ tools:
       - data-collection
       - examination
     platforms: []
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: null
@@ -1888,6 +1956,7 @@ tools:
       - examination
     platforms:
       - macOS
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: download
@@ -1920,6 +1989,7 @@ tools:
       - examination
       - analysis
     platforms: []
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: null
@@ -1950,6 +2020,7 @@ tools:
       - examination
       - analysis
     platforms: []
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: intermediate
     accessType: null
@@ -1980,6 +2051,7 @@ tools:
       - data-collection
       - examination
     platforms: []
+    related_concepts: null
     domain-agnostic-software: null
     skillLevel: advanced
     accessType: null
diff --git a/src/styles/global.css b/src/styles/global.css
index 99034e0..7835110 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -627,7 +627,7 @@ input[type="checkbox"] {
   margin: 0.125rem;
 }
 
-/* Tool Details Modal */
+/* Tool Details Modal - Enhanced for dual modals */
 .tool-details {
   display: none;
   position: fixed;
@@ -640,10 +640,11 @@ input[type="checkbox"] {
   padding: 2rem;
   max-width: 600px;
   width: 90%;
-  max-height: 80vh;
+  max-height: 100vh;
   overflow-y: auto;
   z-index: 1000;
   box-shadow: var(--shadow-lg);
+  transition: var(--transition-medium);
 }
 
 .tool-details.active { display: block; }
@@ -661,6 +662,21 @@ input[type="checkbox"] {
 
 .modal-overlay.active { display: block; }
 
+/* Side-by-side modal positioning */
+.modals-side-by-side #tool-details-primary.active {
+  left: 25%;
+  transform: translate(-50%, -50%);
+  max-width: 45vw;
+  width: 45vw;
+}
+
+.modals-side-by-side #tool-details-secondary.active {
+  left: 75%;
+  transform: translate(-50%, -50%);
+  max-width: 45vw;
+  width: 45vw;
+}
+
 /* Phase Controls */
 .domain-phase-container {
   display: grid;
@@ -1320,6 +1336,15 @@ footer {
 }
 
 /* Consolidated Responsive Design */
+@media (width <= 1200px) {
+  .modals-side-by-side #tool-details-primary.active,
+  .modals-side-by-side #tool-details-secondary.active {
+    max-width: 42vw;
+    width: 42vw;
+  }
+}
+
+
 @media (width <= 768px) {
   .nav-wrapper {
     padding: 0.75rem;
@@ -1369,6 +1394,21 @@ footer {
     max-width: 120px;
     min-height: 50px;
   }
+  .modals-side-by-side #tool-details-primary.active {
+    top: 25%;
+    left: 50%;
+    max-width: 90vw;
+    width: 90vw;
+    max-height: 35vh;
+  }
+  
+  .modals-side-by-side #tool-details-secondary.active {
+    top: 75%;
+    left: 50%;
+    max-width: 90vw;
+    width: 90vw;
+    max-height: 35vh;
+  }
 }
 
 @media (width <= 640px) {
diff --git a/src/utils/dataService.ts b/src/utils/dataService.ts
index f5dabb1..2a63cc3 100644
--- a/src/utils/dataService.ts
+++ b/src/utils/dataService.ts
@@ -21,6 +21,7 @@ const ToolSchema = z.object({
   statusUrl: z.string().optional().nullable(),
   accessType: z.string().optional().nullable(),
   'domain-agnostic-software': z.array(z.string()).optional().nullable(),
+  related_concepts: z.array(z.string()).optional().nullable().default([]),
 });
 
 const ToolsDataSchema = z.object({