diff --git a/OpenNest.Engine/DefaultNestEngine.cs b/OpenNest.Engine/DefaultNestEngine.cs
index 0ee2ab0..1183b41 100644
--- a/OpenNest.Engine/DefaultNestEngine.cs
+++ b/OpenNest.Engine/DefaultNestEngine.cs
@@ -295,6 +295,7 @@ namespace OpenNest
                 foreach (var strategy in FillStrategyRegistry.Strategies)
                 {
                     context.Token.ThrowIfCancellationRequested();
+                    context.ActivePhase = strategy.Phase;
 
                     var sw = Stopwatch.StartNew();
                     var result = strategy.Fill(context);
diff --git a/OpenNest.Engine/Fill/FillExtents.cs b/OpenNest.Engine/Fill/FillExtents.cs
index a058e24..579944f 100644
--- a/OpenNest.Engine/Fill/FillExtents.cs
+++ b/OpenNest.Engine/Fill/FillExtents.cs
@@ -24,10 +24,8 @@ namespace OpenNest.Engine.Fill
         }
 
         public List<Part> Fill(Drawing drawing, double rotationAngle = 0,
-            int plateNumber = 0,
             CancellationToken token = default,
-            IProgress<NestProgress> progress = null,
-            List<Engine.BestFit.BestFitResult> bestFits = null)
+            Action<List<Part>, string> reportProgress = null)
         {
             var pair = BuildPair(drawing, rotationAngle);
             if (pair == null)
@@ -37,14 +35,7 @@ namespace OpenNest.Engine.Fill
             if (column.Count == 0)
                 return new List<Part>();
 
-            NestEngineBase.ReportProgress(progress, new ProgressReport
-            {
-                Phase = NestPhase.Extents,
-                PlateNumber = plateNumber,
-                Parts = column,
-                WorkArea = workArea,
-                Description = $"Extents: initial column {column.Count} parts",
-            });
+            reportProgress?.Invoke(column, $"Extents: initial column {column.Count} parts");
 
             var adjusted = AdjustColumn(pair.Value, column, token);
 
@@ -56,25 +47,11 @@ namespace OpenNest.Engine.Fill
                 adjusted = column;
             }
 
-            NestEngineBase.ReportProgress(progress, new ProgressReport
-            {
-                Phase = NestPhase.Extents,
-                PlateNumber = plateNumber,
-                Parts = adjusted,
-                WorkArea = workArea,
-                Description = $"Extents: column {adjusted.Count} parts",
-            });
+            reportProgress?.Invoke(adjusted, $"Extents: column {adjusted.Count} parts");
 
             var result = RepeatColumns(adjusted, token);
 
-            NestEngineBase.ReportProgress(progress, new ProgressReport
-            {
-                Phase = NestPhase.Extents,
-                PlateNumber = plateNumber,
-                Parts = result,
-                WorkArea = workArea,
-                Description = $"Extents: {result.Count} parts total",
-            });
+            reportProgress?.Invoke(result, $"Extents: {result.Count} parts total");
 
             return result;
         }
diff --git a/OpenNest.Engine/Fill/PairFiller.cs b/OpenNest.Engine/Fill/PairFiller.cs
index 52a4f33..11f7f2a 100644
--- a/OpenNest.Engine/Fill/PairFiller.cs
+++ b/OpenNest.Engine/Fill/PairFiller.cs
@@ -45,9 +45,8 @@ namespace OpenNest.Engine.Fill
         }
 
         public PairFillResult Fill(NestItem item, Box workArea,
-            int plateNumber = 0,
             CancellationToken token = default,
-            IProgress<NestProgress> progress = null)
+            Action<List<Part>, string> reportProgress = null)
         {
             var bestFits = BestFitCache.GetOrCompute(
                 item.Drawing, plateSize.Length, plateSize.Width, partSpacing);
@@ -58,7 +57,7 @@ namespace OpenNest.Engine.Fill
 
             var targetCount = item.Quantity > 0 ? item.Quantity : 0;
             var parts = EvaluateCandidates(candidates, item.Drawing, workArea, targetCount,
-                plateNumber, token, progress);
+                token, reportProgress);
 
             return new PairFillResult { Parts = parts, BestFits = bestFits };
         }
@@ -66,7 +65,7 @@ namespace OpenNest.Engine.Fill
         private List<Part> EvaluateCandidates(
             List<BestFitResult> candidates, Drawing drawing,
             Box workArea, int targetCount,
-            int plateNumber, CancellationToken token, IProgress<NestProgress> progress)
+            CancellationToken token, Action<List<Part>, string> reportProgress)
         {
             List<Part> best = null;
             var sinceImproved = 0;
@@ -112,14 +111,8 @@ namespace OpenNest.Engine.Fill
                             sinceImproved++;
                         }
 
-                        NestEngineBase.ReportProgress(progress, new ProgressReport
-                        {
-                            Phase = NestPhase.Pairs,
-                            PlateNumber = plateNumber,
-                            Parts = best,
-                            WorkArea = workArea,
-                            Description = $"Pairs: {batchStart + j + 1}/{candidates.Count} candidates, best = {best?.Count ?? 0} parts",
-                        });
+                        reportProgress?.Invoke(best,
+                            $"Pairs: {batchStart + j + 1}/{candidates.Count} candidates, best = {best?.Count ?? 0} parts");
                     }
 
                     if (batchEnd >= EarlyExitMinTried && sinceImproved >= EarlyExitStaleLimit)
diff --git a/OpenNest.Engine/Fill/StripeFiller.cs b/OpenNest.Engine/Fill/StripeFiller.cs
index 4150f4f..1e1fdc6 100644
--- a/OpenNest.Engine/Fill/StripeFiller.cs
+++ b/OpenNest.Engine/Fill/StripeFiller.cs
@@ -95,14 +95,8 @@ public class StripeFiller
                 }
             }
 
-            NestEngineBase.ReportProgress(_context.Progress, new ProgressReport
-            {
-                Phase = NestPhase.Custom,
-                PlateNumber = _context.PlateNumber,
-                Parts = bestParts,
-                WorkArea = workArea,
-                Description = $"{strategyName}: {i + 1}/{bestFits.Count} pairs, best = {bestParts?.Count ?? 0} parts",
-            });
+            _context.ReportProgress(bestParts,
+                $"{strategyName}: {i + 1}/{bestFits.Count} pairs, best = {bestParts?.Count ?? 0} parts");
         }
 
         return bestParts ?? new List<Part>();
diff --git a/OpenNest.Engine/Strategies/ExtentsFillStrategy.cs b/OpenNest.Engine/Strategies/ExtentsFillStrategy.cs
index 4530df3..e47f4b9 100644
--- a/OpenNest.Engine/Strategies/ExtentsFillStrategy.cs
+++ b/OpenNest.Engine/Strategies/ExtentsFillStrategy.cs
@@ -24,8 +24,8 @@ namespace OpenNest.Engine.Strategies
 
             return FillHelpers.BestOverAngles(context, angles,
                 angle => filler.Fill(context.Item.Drawing, angle,
-                    context.PlateNumber, context.Token, context.Progress),
-                NestPhase.Extents, "Extents");
+                    context.Token, context.ReportProgress),
+                "Extents");
         }
     }
 }
diff --git a/OpenNest.Engine/Strategies/FillContext.cs b/OpenNest.Engine/Strategies/FillContext.cs
index 733b39a..d03495e 100644
--- a/OpenNest.Engine/Strategies/FillContext.cs
+++ b/OpenNest.Engine/Strategies/FillContext.cs
@@ -23,9 +23,26 @@ namespace OpenNest.Engine.Strategies
         /// <summary>For progress reporting only; comparisons use Policy.Comparer.</summary>
         public FillScore CurrentBestScore { get; set; }
         public NestPhase WinnerPhase { get; set; }
+        public NestPhase ActivePhase { get; set; }
         public List<PhaseResult> PhaseResults { get; } = new();
         public List<AngleResult> AngleResults { get; } = new();
 
         public Dictionary<string, object> SharedState { get; } = new();
+
+        /// <summary>
+        /// Standard progress reporting for strategies and fillers. Reports intermediate
+        /// results using the current ActivePhase, PlateNumber, and WorkArea.
+        /// </summary>
+        public void ReportProgress(List<Part> parts, string description)
+        {
+            NestEngineBase.ReportProgress(Progress, new ProgressReport
+            {
+                Phase = ActivePhase,
+                PlateNumber = PlateNumber,
+                Parts = parts,
+                WorkArea = WorkArea,
+                Description = description,
+            });
+        }
     }
 }
diff --git a/OpenNest.Engine/Strategies/FillHelpers.cs b/OpenNest.Engine/Strategies/FillHelpers.cs
index a951aa1..024122e 100644
--- a/OpenNest.Engine/Strategies/FillHelpers.cs
+++ b/OpenNest.Engine/Strategies/FillHelpers.cs
@@ -113,13 +113,12 @@ namespace OpenNest.Engine.Strategies
         /// <summary>
         /// Sweeps a list of angles, calling fillAtAngle for each, and returns
         /// the best result according to the context's comparer. Handles
-        /// cancellation and progress reporting.
+        /// cancellation and progress reporting via context.ReportProgress.
         /// </summary>
         public static List<Part> BestOverAngles(
             FillContext context,
             IReadOnlyList<double> angles,
             Func<double, List<Part>> fillAtAngle,
-            NestPhase phase,
             string phaseLabel)
         {
             var workArea = context.WorkArea;
@@ -140,14 +139,8 @@ namespace OpenNest.Engine.Strategies
                         best = result;
                 }
 
-                NestEngineBase.ReportProgress(context.Progress, new ProgressReport
-                {
-                    Phase = phase,
-                    PlateNumber = context.PlateNumber,
-                    Parts = best,
-                    WorkArea = workArea,
-                    Description = $"{phaseLabel}: {i + 1}/{angles.Count} angles, {angleDeg:F0}° best = {best?.Count ?? 0} parts",
-                });
+                context.ReportProgress(best,
+                    $"{phaseLabel}: {i + 1}/{angles.Count} angles, {angleDeg:F0}° best = {best?.Count ?? 0} parts");
             }
 
             return best ?? new List<Part>();
diff --git a/OpenNest.Engine/Strategies/LinearFillStrategy.cs b/OpenNest.Engine/Strategies/LinearFillStrategy.cs
index a9a7265..8c1c278 100644
--- a/OpenNest.Engine/Strategies/LinearFillStrategy.cs
+++ b/OpenNest.Engine/Strategies/LinearFillStrategy.cs
@@ -40,7 +40,7 @@ namespace OpenNest.Engine.Strategies
 
                     return result;
                 },
-                NestPhase.Linear, "Linear");
+                "Linear");
         }
     }
 }
diff --git a/OpenNest.Engine/Strategies/PairsFillStrategy.cs b/OpenNest.Engine/Strategies/PairsFillStrategy.cs
index e9b7f0a..76a9d44 100644
--- a/OpenNest.Engine/Strategies/PairsFillStrategy.cs
+++ b/OpenNest.Engine/Strategies/PairsFillStrategy.cs
@@ -30,7 +30,7 @@ namespace OpenNest.Engine.Strategies
                 var dedup = GridDedup.GetOrCreate(context.SharedState);
                 var filler = new PairFiller(context.Plate, comparer, dedup);
                 var result = filler.Fill(context.Item, context.WorkArea,
-                    context.PlateNumber, context.Token, context.Progress);
+                    context.Token, context.ReportProgress);
 
                 context.SharedState["BestFits"] = result.BestFits;