diff --git a/package.json b/package.json
index fb135cf..0e371c3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "LiteRyzJS/Project",
-  "version": "0.2.0.256",
+  "version": "0.2.0.508",
   "devDependencies": {
     "css-loader": "^7.1.2",
     "sass": "^1.77.8",
diff --git a/src/project/project.js b/src/project/project.js
index 9529a36..600967f 100644
--- a/src/project/project.js
+++ b/src/project/project.js
@@ -9,7 +9,7 @@ class Project {
     const a = this;
     const _options = Object.assign(a.DefaultOptions, options);
 
-    a.Debug = false;
+    a.Debug = true;
     a.Project = _options;
     a.Tasks = [];
   }
@@ -190,19 +190,18 @@ class Project {
     a.Sort();
 
     // Get flat references
-    let result = a.Tasks.flatten("Tasks");
+    let allTasks = a.Tasks.flatten("Tasks");
 
     // Reset calculated values
-    for (var i=0; i<result.length; i++) {
-      result[i].Order = (i + 1);
-      result[i].StartDate = null;
-      result[i].FinishDate = null;
-      result[i].CalcWorkHours = null;
+    for (var i=0; i<allTasks.length; i++) {
+      allTasks[i].Order = (i + 1);
+      allTasks[i].StartDate = null;
+      allTasks[i].FinishDate = null;
+      allTasks[i].CalcWorkHours = null;
     }
 
-    // Maximum 128 rounds
-    for (var x=0; x<128; x++) {
-      let pendingCount = result.copy().countMany(
+    for (var x=0; x<16; x++) {
+      let pendingCount = allTasks.countMany(
         { propName: "StartDate", value: null },
         { propName: "FinishDate", value: null }
       );
@@ -215,78 +214,11 @@ class Project {
 
       a.#log("Round " + (x + 1));
 
-      for (var i=0; i<result.length; i++) {
-        const nodeType = a.GetNodeType(result[i]);
-
-        switch (nodeType) {
-          case 1:     // task no-parent/root
-            result[i].StartDate = Date.addDays(a.Project.StartDate, result[i].StartDelay);
-            result[i].FinishDate = Date.addDays(result[i].StartDate, result[i].Duration);
-            break;
-          case 2:     // task no-parent/root, collated/group
-            result[i].StartDate = Date.addDays(a.Project.StartDate, result[i].StartDelay);
-            result[i].Progress = 0;
-
-            // update finish date, if possible
-            a.#recalculateCollatedTask(result, i);
-
-            break;
-          case 3:     // task with parent
-            const node3 = result.first("ID", result[i].PredecessorTaskID);
-            if (node3 != null) {
-              if (node3.FinishDate != null) {
-                result[i].StartDate = Date.addDays(node3.FinishDate, result[i].StartDelay);
-                result[i].FinishDate = Date.addDays(result[i].StartDate, result[i].Duration);
-              }
-            }
-
-            break;
-          case 4:     // task with parent, collated/group
-            const node4 = result.first("ID", result[i].PredecessorTaskID);
-            if (node4 != null) {
-              if (node4.FinishDate != null) {
-                result[i].StartDate = Date.addDays(node4.FinishDate, result[i].StartDelay);
-                result[i].Progress = 0;
-
-                // update finish date, if possible
-                a.#recalculateCollatedTask(result, i);
-              }
-            }
-
-            break;
-          case 5:     // sub-task
-            const node5 = result.first("ID", result[i].CollatedTaskID);
-            if (node5 != null) {
-              if (node5.StartDate != null) {
-                result[i].StartDate = Date.addDays(node5.StartDate, result[i].StartDelay);
-                result[i].FinishDate = Date.addDays(result[i].StartDate, result[i].Duration);
-                result[i].Level = (node5.Level + 1);
-              }
-            }
-
-            break;
-          case 6:     // sub-task, collated/group
-            const node6 = result.first("ID", result[i].CollatedTaskID);
-            if (node6 != null) {
-              if (node6.StartDate != null) {
-                result[i].StartDate = Date.addDays(node6.StartDate, result[i].StartDelay);
-                result[i].Progress = 0;
-                result[i].Level = (node6.Level + 1);
-
-                // update finish date, if possible
-                a.#recalculateCollatedTask(result, i);
-              }
-            }
-
-            break;
-          default:    // orphan
-            break;
-        }
-      }
+      a.#recalculateTask(allTasks, a.Tasks);
     }
 
     // Calculate work-hours
-    a.#recalculateWorkHours(result);
+    a.#recalculateWorkHours(allTasks);
 
     return isSuccess;
   }
@@ -333,32 +265,73 @@ class Project {
     }
   }
 
-  #recalculateCollatedTask(array, index) {
-    let node2 = array.select("CollatedTaskID", array[index].ID);
-    if (node2.length <= 0) {
-      // No children
-      array[index].Duration = 0;
+  #recalculateTask(allTasks, tasks) {
+    const a = this;
 
-      return new Date(array[index].StartDate);
-    }
+    for (let i=0; i<tasks.length; i++) {
+      const task = tasks[i];
 
-    // Not ready, calculation pending
-    if (node2.any("FinishDate", null)) {
-      array[index].Duration = 0;
+      a.#log(task.Name);
 
-      return null;
-    }
+      if (task.PredecessorTaskID != null) {
+        const parentTask = allTasks.first("ID", task.PredecessorTaskID);
+        if (parentTask != null) {
+          if (parentTask.FinishDate != null) {
+            task.StartDate = Date.addDays(parentTask.FinishDate, task.StartDelay);
 
-    let node2FinishDate = new Date(array[index].StartDate);
-    node2.forEach(e => {
-      if (e.FinishDate > node2FinishDate) {
-        node2FinishDate = e.FinishDate;
+            a.#log("> Set StartDate from Predecessor");
+          }
+        }
+      } else if (task.CollatedTaskID != null) {
+          const groupTask = allTasks.first("ID", task.CollatedTaskID);
+          if (groupTask != null) {
+            if (groupTask.StartDate != null) {
+              task.StartDate = Date.addDays(groupTask.StartDate, task.StartDelay);
+
+              a.#log("> Set StartDate from Group");
+            }
+          }
+      } else {
+        task.StartDate = Date.addDays(a.Project.StartDate, task.StartDelay);
+
+        a.#log("> Set StartDate from Project");
       }
-    });
 
-    array[index].Progress = Math.average(node2.toList("Progress"));
-    array[index].FinishDate = new Date(node2FinishDate);
-    array[index].Duration = Date.diffDays(array[index].StartDate, array[index].FinishDate);
+      // if (task.IsCollated) {
+      if (task.Tasks.length > 0) {
+        a.#recalculateTask(allTasks, task.Tasks);
+
+        a.#log("> Calc inner");
+      }
+      // }
+
+      if (task.StartDate != null) {
+        if (task.IsCollated) {
+
+          const childTasks = task.Tasks.select("CollatedTaskID", task.ID);
+          if (childTasks.length <= 0) {
+            task.FinishDate = task.StartDate;
+            task.Duration = 0;
+
+            a.#log("> Set FinishDate from Group (0)");
+          } else {
+
+            if (!childTasks.any("FinishDate", null)) {
+              task.FinishDate = childTasks.orderByDesc("FinishDate")[0].FinishDate;
+              task.Duration = Date.diffDays(task.StartDate, task.FinishDate);
+
+              a.#log("> Set FinishDate from Group");
+            }
+          }
+
+        } else {
+          task.FinishDate = Date.addDays(task.StartDate, task.Duration);
+
+          a.#log("> Set FinishDate");
+        }
+      }
+
+    }
   }
 
   #sortNode(node) {