diff --git a/src/main/java/com/metaweb/gridlock/GridlockServlet.java b/src/main/java/com/metaweb/gridlock/GridlockServlet.java
index 1e8a3e3bf..5ed0a9ee9 100644
--- a/src/main/java/com/metaweb/gridlock/GridlockServlet.java
+++ b/src/main/java/com/metaweb/gridlock/GridlockServlet.java
@@ -23,6 +23,7 @@ import com.metaweb.gridlock.commands.GetHistoryCommand;
 import com.metaweb.gridlock.commands.GetProcessesCommand;
 import com.metaweb.gridlock.commands.GetProjectMetadataCommand;
 import com.metaweb.gridlock.commands.GetRowsCommand;
+import com.metaweb.gridlock.commands.ReconcileCommand;
 import com.metaweb.gridlock.commands.UndoRedoCommand;
 
 public class GridlockServlet extends HttpServlet {
@@ -42,6 +43,7 @@ public class GridlockServlet extends HttpServlet {
 		_commands.put("undo-redo", new UndoRedoCommand());
 		_commands.put("compute-facets", new ComputeFacetsCommand());
 		_commands.put("do-text-transform", new DoTextTransformCommand());
+		_commands.put("reconcile", new ReconcileCommand());
 	}
 
 	@Override
diff --git a/src/main/java/com/metaweb/gridlock/commands/DoTextTransformCommand.java b/src/main/java/com/metaweb/gridlock/commands/DoTextTransformCommand.java
index c07fb26e8..9632e69c3 100644
--- a/src/main/java/com/metaweb/gridlock/commands/DoTextTransformCommand.java
+++ b/src/main/java/com/metaweb/gridlock/commands/DoTextTransformCommand.java
@@ -10,6 +10,9 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 
+import com.metaweb.gridlock.browsing.Engine;
+import com.metaweb.gridlock.browsing.FilteredRows;
+import com.metaweb.gridlock.browsing.RowVisitor;
 import com.metaweb.gridlock.expr.Evaluable;
 import com.metaweb.gridlock.expr.Parser;
 import com.metaweb.gridlock.history.CellChange;
@@ -27,45 +30,60 @@ public class DoTextTransformCommand extends Command {
 	public void doPost(HttpServletRequest request, HttpServletResponse response)
 			throws ServletException, IOException {
 		
-		Project project = getProject(request);
-		int cellIndex = Integer.parseInt(request.getParameter("cell"));
-		
-		Column column = project.columnModel.getColumnByCellIndex(cellIndex);
-		if (column == null) {
-			respond(response, "{ \"code\" : \"error\", \"message\" : \"No such column\" }");
-			return;
-		}
-		
-		String columnName = column.headerLabel;
-		String expression = request.getParameter("expression");
-		
 		try {
+			Project project = getProject(request);
+			Engine engine = getEngine(request, project);
+			
+			int cellIndex = Integer.parseInt(request.getParameter("cell"));
+			Column column = project.columnModel.getColumnByCellIndex(cellIndex);
+			if (column == null) {
+				respond(response, "{ \"code\" : \"error\", \"message\" : \"No such column\" }");
+				return;
+			}
+			
+			String columnName = column.headerLabel;
+			String expression = request.getParameter("expression");
+			
 			Evaluable eval = new Parser(expression).getExpression();
-			//System.out.println("--- " + eval.toString());
 			Properties bindings = new Properties();
 			bindings.put("project", project);
 			
 			List<CellChange> cellChanges = new ArrayList<CellChange>(project.rows.size());
 			
-			for (int r = 0; r < project.rows.size(); r++) {
-				Row row = project.rows.get(r);
-				if (cellIndex < row.cells.size()) {
-					Cell cell = row.cells.get(cellIndex);
-					if (cell.value == null) {
-						continue;
-					}
-					
-					bindings.put("cell", cell);
-					bindings.put("value", cell.value);
-					
-					Cell newCell = new Cell();
-					newCell.value = eval.evaluate(bindings);
-					newCell.recon = cell.recon;
-					
-					CellChange cellChange = new CellChange(r, cellIndex, cell, newCell);
-					cellChanges.add(cellChange);
+			FilteredRows filteredRows = engine.getAllFilteredRows();
+			filteredRows.accept(project, new RowVisitor() {
+				int cellIndex;
+				Properties bindings;
+				List<CellChange> cellChanges;
+				Evaluable eval;
+				
+				public RowVisitor init(int cellIndex, Properties bindings, List<CellChange> cellChanges, Evaluable eval) {
+					this.cellIndex = cellIndex;
+					this.bindings = bindings;
+					this.cellChanges = cellChanges;
+					this.eval = eval;
+					return this;
 				}
-			}
+				
+				@Override
+				public boolean visit(Project project, int rowIndex, Row row) {
+					if (cellIndex < row.cells.size()) {
+						Cell cell = row.cells.get(cellIndex);
+						if (cell.value != null) {
+							bindings.put("cell", cell);
+							bindings.put("value", cell.value);
+							
+							Cell newCell = new Cell();
+							newCell.value = eval.evaluate(bindings);
+							newCell.recon = cell.recon;
+							
+							CellChange cellChange = new CellChange(rowIndex, cellIndex, cell, newCell);
+							cellChanges.add(cellChange);
+						}
+					}
+					return false;
+				}
+			}.init(cellIndex, bindings, cellChanges, eval));
 			
 			MassCellChange massCellChange = new MassCellChange(cellChanges);
 			HistoryEntry historyEntry = new HistoryEntry(
diff --git a/src/main/java/com/metaweb/gridlock/commands/ReconcileCommand.java b/src/main/java/com/metaweb/gridlock/commands/ReconcileCommand.java
new file mode 100644
index 000000000..54cb16bd1
--- /dev/null
+++ b/src/main/java/com/metaweb/gridlock/commands/ReconcileCommand.java
@@ -0,0 +1,82 @@
+package com.metaweb.gridlock.commands;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import com.metaweb.gridlock.browsing.Engine;
+import com.metaweb.gridlock.browsing.FilteredRows;
+import com.metaweb.gridlock.browsing.RowVisitor;
+import com.metaweb.gridlock.model.Cell;
+import com.metaweb.gridlock.model.Column;
+import com.metaweb.gridlock.model.Project;
+import com.metaweb.gridlock.model.Row;
+import com.metaweb.gridlock.process.ReconProcess;
+import com.metaweb.gridlock.process.ReconProcess.ReconEntry;
+
+public class ReconcileCommand extends Command {
+	
+	@Override
+	public void doPost(HttpServletRequest request, HttpServletResponse response)
+			throws ServletException, IOException {
+		
+		try {
+			Project project = getProject(request);
+			Engine engine = getEngine(request, project);
+			
+			int cellIndex = Integer.parseInt(request.getParameter("cell"));
+			Column column = project.columnModel.getColumnByCellIndex(cellIndex);
+			if (column == null) {
+				respond(response, "{ \"code\" : \"error\", \"message\" : \"No such column\" }");
+				return;
+			}
+			
+			String columnName = column.headerLabel;
+			String typeID = request.getParameter("type");
+			
+			List<ReconEntry> entries = new ArrayList<ReconEntry>(project.rows.size());
+			
+			FilteredRows filteredRows = engine.getAllFilteredRows();
+			filteredRows.accept(project, new RowVisitor() {
+				int cellIndex;
+				List<ReconEntry> entries;
+				
+				public RowVisitor init(int cellIndex, List<ReconEntry> entries) {
+					this.cellIndex = cellIndex;
+					this.entries = entries;
+					return this;
+				}
+				
+				@Override
+				public boolean visit(Project project, int rowIndex, Row row) {
+					if (cellIndex < row.cells.size()) {
+						Cell cell = row.cells.get(cellIndex);
+						if (cell.value != null) {
+							entries.add(new ReconEntry(rowIndex, cell));
+						}
+					}
+					return false;
+				}
+			}.init(cellIndex, entries));
+			
+			ReconProcess process = new ReconProcess(
+				project,
+				"Reconcile " + columnName + " to type " + typeID,
+				cellIndex,
+				entries,
+				typeID
+			);
+			
+			boolean done = project.processManager.queueProcess(process);
+			
+			respond(response, "{ \"code\" : " + (done ? "\"ok\"" : "\"pending\"") + " }");
+			
+		} catch (Exception e) {
+			respondException(response, e);
+		}
+	}
+}
diff --git a/src/main/java/com/metaweb/gridlock/history/History.java b/src/main/java/com/metaweb/gridlock/history/History.java
index 222e32f23..0663f77c3 100644
--- a/src/main/java/com/metaweb/gridlock/history/History.java
+++ b/src/main/java/com/metaweb/gridlock/history/History.java
@@ -25,7 +25,11 @@ public class History implements Serializable {
 	}
 	
 	public void addEntry(HistoryEntry entry) {
+		for (HistoryEntry entry2 : _futureEntries) {
+			entry2.delete();
+		}
 		_futureEntries.clear();
+		
 		_pastEntries.add(entry);
 		entry.apply(ProjectManager.singleton.getProject(_projectID));
 	}
@@ -54,6 +58,21 @@ public class History implements Serializable {
 		}
 	}
 	
+	protected HistoryEntry getEntry(long entryID) {
+		for (int i = 0; i < _pastEntries.size(); i++) {
+			if (_pastEntries.get(i).id == entryID) {
+				return _pastEntries.get(i);
+			}
+		}
+		
+		for (int i = 0; i < _futureEntries.size(); i++) {
+			if (_futureEntries.get(i).id == entryID) {
+				return _futureEntries.get(i);
+			}
+		}
+		return null;
+	}
+	
 	protected void undo(int times) {
 		Project project = ProjectManager.singleton.getProject(_projectID);
 		
diff --git a/src/main/java/com/metaweb/gridlock/history/HistoryEntry.java b/src/main/java/com/metaweb/gridlock/history/HistoryEntry.java
index 4395709f1..1b312546b 100644
--- a/src/main/java/com/metaweb/gridlock/history/HistoryEntry.java
+++ b/src/main/java/com/metaweb/gridlock/history/HistoryEntry.java
@@ -64,6 +64,13 @@ public class HistoryEntry implements Serializable {
 		_change.revert(project);
 	}
 	
+	public void delete() {
+		File file = getFile();
+		if (file.exists()) {
+			file.delete();
+		}
+	}
+	
 	protected void loadChange() {
 		File file = getFile();
 		
diff --git a/src/main/java/com/metaweb/gridlock/history/HistoryProcess.java b/src/main/java/com/metaweb/gridlock/history/HistoryProcess.java
index 2be1d80ef..b8d7e5846 100644
--- a/src/main/java/com/metaweb/gridlock/history/HistoryProcess.java
+++ b/src/main/java/com/metaweb/gridlock/history/HistoryProcess.java
@@ -1,20 +1,35 @@
 package com.metaweb.gridlock.history;
 
+import java.util.Properties;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
 import com.metaweb.gridlock.model.Project;
 import com.metaweb.gridlock.process.Process;
 import com.metaweb.gridlock.process.ProcessManager;
 
 public class HistoryProcess extends Process {
 	final protected Project _project;
-	final protected long _lastDoneID;
-	
+	final protected long 	_lastDoneID;
+	final protected String	_description;
+	boolean _done = false;
+
 	public HistoryProcess(Project project, long lastDoneID) {
 		_project = project;
 		_lastDoneID = lastDoneID;
+		
+		if (_lastDoneID == 0) {
+			_description = "Undo all";
+		} else {
+			HistoryEntry entry = _project.history.getEntry(_lastDoneID);
+			_description = "Undo/redo until after " + entry.description;
+		}
 	}
 	
 	@Override
 	public void cancel() {
+		throw new RuntimeException("Not a long-running process");
 	}
 
 	@Override
@@ -25,9 +40,32 @@ public class HistoryProcess extends Process {
 	@Override
 	public void performImmediate() {
 		_project.history.undoRedo(_lastDoneID);
+		_done = true;
 	}
 
 	@Override
 	public void startPerforming(ProcessManager manager) {
+		throw new RuntimeException("Not a long-running process");
+	}
+
+	@Override
+	public JSONObject getJSON(Properties options) throws JSONException {
+		JSONObject o = new JSONObject();
+		
+		o.put("description", _description);
+		o.put("immediate", true);
+		o.put("status", _done ? "done" : "pending");
+		
+		return o;
+	}
+
+	@Override
+	public boolean isDone() {
+		throw new RuntimeException("Not a long-running process");
+	}
+
+	@Override
+	public boolean isRunning() {
+		throw new RuntimeException("Not a long-running process");
 	}
 }
diff --git a/src/main/java/com/metaweb/gridlock/process/LongRunningProcess.java b/src/main/java/com/metaweb/gridlock/process/LongRunningProcess.java
index 9f86a5cbb..c2fccb375 100644
--- a/src/main/java/com/metaweb/gridlock/process/LongRunningProcess.java
+++ b/src/main/java/com/metaweb/gridlock/process/LongRunningProcess.java
@@ -6,10 +6,11 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 abstract public class LongRunningProcess extends Process {
-	final protected String _description;
+	final protected String 		_description;
 	protected ProcessManager 	_manager;
 	protected Thread 			_thread;
 	protected int				_progress; // out of 100
+	protected boolean			_canceled;
 	
 	protected LongRunningProcess(String description) {
 		_description = description;
@@ -17,11 +18,14 @@ abstract public class LongRunningProcess extends Process {
 
 	@Override
 	public void cancel() {
-		// TODO Auto-generated method stub
-
+		_canceled = true;
+		if (_thread != null && _thread.isAlive()) {
+			_thread.interrupt();
+		}
 	}
 
 	@Override
+	public
 	JSONObject getJSON(Properties options) throws JSONException {
 		JSONObject o = new JSONObject();
 		
@@ -37,6 +41,16 @@ abstract public class LongRunningProcess extends Process {
 	public boolean isImmediate() {
 		return false;
 	}
+	
+	@Override
+	public boolean isRunning() {
+		return _thread != null && _thread.isAlive();
+	}
+	
+	@Override
+	public boolean isDone() {
+		return _thread != null && !_thread.isAlive();
+	}
 
 	@Override
 	public void performImmediate() {
diff --git a/src/main/java/com/metaweb/gridlock/process/Process.java b/src/main/java/com/metaweb/gridlock/process/Process.java
index cc3592955..db118baf6 100644
--- a/src/main/java/com/metaweb/gridlock/process/Process.java
+++ b/src/main/java/com/metaweb/gridlock/process/Process.java
@@ -16,5 +16,5 @@ public abstract class Process {
 	abstract public void startPerforming(ProcessManager manager);
 	abstract public void cancel();
 	
-	abstract JSONObject getJSON(Properties options) throws JSONException;
+	public abstract JSONObject getJSON(Properties options) throws JSONException;
 }
diff --git a/src/main/java/com/metaweb/gridlock/process/ProcessManager.java b/src/main/java/com/metaweb/gridlock/process/ProcessManager.java
index 8922c8c3d..2de629d2f 100644
--- a/src/main/java/com/metaweb/gridlock/process/ProcessManager.java
+++ b/src/main/java/com/metaweb/gridlock/process/ProcessManager.java
@@ -33,11 +33,15 @@ public class ProcessManager {
 			return true;
 		} else {
 			_processes.add(process);
+			
+			update();
+			
 			return false;
 		}
 	}
 	
 	public void onDoneProcess(Process p) {
+		_processes.remove(p);
 		update();
 	}
 	
diff --git a/src/main/java/com/metaweb/gridlock/process/QuickHistoryEntryProcess.java b/src/main/java/com/metaweb/gridlock/process/QuickHistoryEntryProcess.java
index f4c73cdf5..f496e8353 100644
--- a/src/main/java/com/metaweb/gridlock/process/QuickHistoryEntryProcess.java
+++ b/src/main/java/com/metaweb/gridlock/process/QuickHistoryEntryProcess.java
@@ -45,6 +45,7 @@ public class QuickHistoryEntryProcess extends Process {
 	}
 
 	@Override
+	public
 	JSONObject getJSON(Properties options) throws JSONException {
 		JSONObject o = new JSONObject();
 		
diff --git a/src/main/java/com/metaweb/gridlock/process/ReconProcess.java b/src/main/java/com/metaweb/gridlock/process/ReconProcess.java
new file mode 100644
index 000000000..729205206
--- /dev/null
+++ b/src/main/java/com/metaweb/gridlock/process/ReconProcess.java
@@ -0,0 +1,73 @@
+package com.metaweb.gridlock.process;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+
+import com.metaweb.gridlock.model.Cell;
+import com.metaweb.gridlock.model.Project;
+
+public class ReconProcess extends LongRunningProcess implements Runnable {
+	static public class ReconEntry {
+		final public int rowIndex;
+		final public Cell cell;
+		
+		public ReconEntry(int rowIndex, Cell cell) {
+			this.rowIndex = rowIndex;
+			this.cell = cell;
+		}
+	}
+	
+	final protected Project				_project;
+	final protected int					_cellIndex;
+	final protected List<ReconEntry> 	_entries;
+	final protected String 				_typeID;
+	
+	public ReconProcess(Project project, String description, int cellIndex, List<ReconEntry> entries, String typeID) {
+		super(description);
+		_project = project;
+		_cellIndex = cellIndex;
+		_entries = entries;
+		_typeID = typeID;
+	}
+	
+	@Override
+	protected Runnable getRunnable() {
+		return this;
+	}
+	
+	@Override
+	public void run() {
+		Map<String, List<ReconEntry>> valueToEntries = new HashMap<String, List<ReconEntry>>();
+		
+		for (ReconEntry entry : _entries) {
+			Object value = entry.cell.value;
+			if (value != null && value instanceof String) {
+				List<ReconEntry> entries2;
+				if (valueToEntries.containsKey(value)) {
+					entries2 = valueToEntries.get(value);
+				} else {
+					entries2 = new LinkedList<ReconEntry>();
+					valueToEntries.put((String) value, entries2);
+				}
+				entries2.add(entry);
+			}
+		}
+		
+		List<String> values = new ArrayList<String>(valueToEntries.keySet());
+		for (int i = 0; i < values.size(); i += 20) {
+			_progress = i * 100 / values.size();
+			try {
+				Thread.sleep(100);
+			} catch (InterruptedException e) {
+				if (_canceled) {
+					break;
+				}
+			}
+		}
+		
+		_project.processManager.onDoneProcess(this);
+	}
+}
diff --git a/src/main/webapp/project.html b/src/main/webapp/project.html
index 8cc87d7a1..badd0137a 100644
--- a/src/main/webapp/project.html
+++ b/src/main/webapp/project.html
@@ -1 +1 @@
-<html>
<head>
    <title>Gridlock</title>
    <link rel="stylesheet" href="/styles/common.css" />
    <link rel="stylesheet" href="/styles/project.css" />
    <link rel="stylesheet" href="/styles/history.css" />
    <link rel="stylesheet" href="/styles/browsing.css" />
    <link rel="stylesheet" href="/styles/process.css" />
    
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
    
    <script type="text/javascript" src="scripts/util/misc.js"></script>
    <script type="text/javascript" src="scripts/util/url.js"></script>
    <script type="text/javascript" src="scripts/util/string.js"></script>
    <script type="text/javascript" src="scripts/util/ajax.js"></script>
    <script type="text/javascript" src="scripts/util/menu.js"></script>
    
    <script type="text/javascript" src="scripts/project.js"></script>
    <script type="text/javascript" src="scripts/project/list-facet.js"></script>
    <script type="text/javascript" src="scripts/project/browsing-engine.js"></script>
    <script type="text/javascript" src="scripts/project/data-table-view.js"></script>
    <script type="text/javascript" src="scripts/project/history-widget.js"></script>
    <script type="text/javascript" src="scripts/project/process-widget.js"></script>
</head>
<body>
    <div id="header">
        <h1 id="title">Gridlock</h1>
    </div>
    
    <div id="body">
        Loading ...
    </div>
</body>
</html>
\ No newline at end of file
+<html>
<head>
    <title>Gridlock</title>
    <link type="text/css" rel="stylesheet" href="http://freebaselibs.com/static/suggest/1.0.3/suggest.min.css" />
    <link rel="stylesheet" href="/styles/common.css" />
    <link rel="stylesheet" href="/styles/project.css" />
    <link rel="stylesheet" href="/styles/history.css" />
    <link rel="stylesheet" href="/styles/browsing.css" />
    <link rel="stylesheet" href="/styles/process.css" />
    
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
    <script type="text/javascript" src="http://freebaselibs.com/static/suggest/1.0.3/suggest.min.js"></script>
    
    <script type="text/javascript" src="scripts/util/misc.js"></script>
    <script type="text/javascript" src="scripts/util/url.js"></script>
    <script type="text/javascript" src="scripts/util/string.js"></script>
    <script type="text/javascript" src="scripts/util/ajax.js"></script>
    <script type="text/javascript" src="scripts/util/menu.js"></script>
    <script type="text/javascript" src="scripts/util/dialog.js"></script>
    
    <script type="text/javascript" src="scripts/project.js"></script>
    <script type="text/javascript" src="scripts/project/list-facet.js"></script>
    <script type="text/javascript" src="scripts/project/browsing-engine.js"></script>
    <script type="text/javascript" src="scripts/project/data-table-view.js"></script>
    <script type="text/javascript" src="scripts/project/history-widget.js"></script>
    <script type="text/javascript" src="scripts/project/process-widget.js"></script>
    <script type="text/javascript" src="scripts/project/recon-dialog.js"></script>
</head>
<body>
    <div id="header">
        <h1 id="title">Gridlock</h1>
    </div>
    
    <div id="body">
        Loading ...
    </div>
</body>
</html>
\ No newline at end of file
diff --git a/src/main/webapp/scripts/project/data-table-view.js b/src/main/webapp/scripts/project/data-table-view.js
index 7abb32f4d..417dd14e7 100644
--- a/src/main/webapp/scripts/project/data-table-view.js
+++ b/src/main/webapp/scripts/project/data-table-view.js
@@ -45,6 +45,7 @@ DataTableView.prototype.render = function() {
     var trHead = table.insertRow(0);
     
     var td = trHead.insertCell(trHead.cells.length);
+    $(td).addClass("column-header");
     $('<img src="/images/menu-dropdown.png" />').addClass("column-header-menu").appendTo(td).click(function() {
         self._createMenuForAllColumns(this);
     });
@@ -267,7 +268,9 @@ DataTableView.prototype._createMenuForColumnHeader = function(column, index, elm
             submenu: [
                 {
                     label: "Initiate on Filtered Rows...",
-                    click: function() {}
+                    click: function() {
+                        new ReconDialog(index);
+                    }
                 },
                 {},
                 {
@@ -283,7 +286,7 @@ DataTableView.prototype._doTextTransform = function(column, expression) {
     var self = this;
     $.post(
         "/command/do-text-transform?" + $.param({ project: theProject.id, cell: column.cellIndex, expression: expression }), 
-        null,
+        { engine: JSON.stringify(ui.browsingEngine.getJSON()) },
         function(data) {
             if (data.code == "ok") {
                 self.update();
diff --git a/src/main/webapp/scripts/project/process-widget.js b/src/main/webapp/scripts/project/process-widget.js
index e7ee72e21..24d479baa 100644
--- a/src/main/webapp/scripts/project/process-widget.js
+++ b/src/main/webapp/scripts/project/process-widget.js
@@ -24,9 +24,11 @@ ProcessWidget.prototype._render = function() {
     
     this._div.empty();
     
-    var bodyDiv = $('<div></div>').addClass("process-panel-inner").text("Testing").appendTo(this._div);
+    var bodyDiv = $('<div></div>').addClass("process-panel-inner").appendTo(this._div);
     if (this._data.processes.length == 0) {
         this._div.hide();
+
+        ui.historyWidget.update();
         return;
     }
     
diff --git a/src/main/webapp/scripts/project/recon-dialog.js b/src/main/webapp/scripts/project/recon-dialog.js
new file mode 100644
index 000000000..98ba7baf2
--- /dev/null
+++ b/src/main/webapp/scripts/project/recon-dialog.js
@@ -0,0 +1,48 @@
+function ReconDialog(columnIndex) {
+    this._columnIndex = columnIndex;
+    this._column = theProject.columnModel.columns[columnIndex];
+    
+    this._createDialog();
+}
+
+ReconDialog.prototype._createDialog = function() {
+    var self = this;
+    var frame = DialogSystem.createDialog();
+    frame.width("400px");
+    
+    var header = $('<div></div>').addClass("dialog-header").text("Reconcile column " + this._column.headerLabel).appendTo(frame);
+    var body = $('<div></div>').addClass("dialog-body").appendTo(frame);
+    var footer = $('<div></div>').addClass("dialog-footer").appendTo(frame);
+    
+    $('<p></p>').text("Reconcile cell values to topics of type:").appendTo(body);
+    
+    var type = null;
+    var input = $('<input />').appendTo($('<p></p>').appendTo(body));
+    input.suggest({ type : '/type/type' }).bind("fb-select", function(e, data) {
+        type = data.id;
+    });
+    
+    $('<button></button>').text("Start Reconciling").click(function() {
+        DialogSystem.dismissUntil(level - 1);
+        $.post(
+            "/command/reconcile?" + $.param({ project: theProject.id, cell: self._column.cellIndex, type: type }), 
+            { engine: JSON.stringify(ui.browsingEngine.getJSON()) },
+            function(data) {
+                if (data.code != "error") {
+                    ui.processWidget.update();
+                } else {
+                    alert(data.message);
+                }
+            },
+            "json"
+        );
+    }).appendTo(footer);
+    
+    $('<button></button>').text("Cancel").click(function() {
+        DialogSystem.dismissUntil(level - 1);
+    }).appendTo(footer);
+    
+    var level = DialogSystem.showDialog(frame);
+    
+    input[0].focus();
+};
diff --git a/src/main/webapp/scripts/util/dialog.js b/src/main/webapp/scripts/util/dialog.js
new file mode 100644
index 000000000..df75cb98a
--- /dev/null
+++ b/src/main/webapp/scripts/util/dialog.js
@@ -0,0 +1,70 @@
+DialogSystem = {
+    _layers: [],
+    _bottomOverlay: null
+};
+
+DialogSystem.showDialog = function(elmt, onCancel) {
+    if (DialogSystem._bottomOverlay == null) {
+        DialogSystem._bottomOverlay = $('<div>&nbsp;</div>')
+            .addClass("dialog-overlay")
+            .css("z-index", 100)
+            .appendTo(document.body);
+    }
+    
+    var overlay = $('<div>&nbsp;</div>')
+        .addClass("dialog-overlay2")
+        .css("z-index", 101 + DialogSystem._layers.length * 2)
+        .appendTo(document.body);
+        
+    var container = $('<div></div>')
+        .addClass("dialog-container")
+        .css("z-index", 102 + DialogSystem._layers.length * 2)
+        .appendTo(document.body);
+        
+    elmt.css("visibility", "hidden").appendTo(container);
+    container.css("top", Math.round((overlay.height() - elmt.height()) / 2) + "px");
+    elmt.css("visibility", "visible");
+    
+    var layer = {
+        overlay: overlay,
+        container: container,
+        onCancel: onCancel
+    };
+    DialogSystem._layers.push(layer);
+    
+    var level = DialogSystem._layers.length;
+    return level;
+};
+
+DialogSystem.dismissAll = function() {
+    DialogSystem.dismissUntil(0);
+};
+
+DialogSystem.dismissUntil = function(level) {
+    for (var i = DialogSystem._layers.length - 1; i >= level; i--) {
+        var layer = DialogSystem._layers[i];
+        layer.overlay.remove();
+        layer.container.remove();
+        
+        if (layer.onCancel) {
+            try {
+                layer.onCancel();
+            } catch (e) {
+                console.log(e);
+            }
+        }
+    }
+    DialogSystem._layers = DialogSystem._layers.slice(0, level);
+    
+    if (level == 0) {
+        if (DialogSystem._bottomOverlay != null) {
+            DialogSystem._bottomOverlay.remove();
+            DialogSystem._bottomOverlay = null;
+        }
+    }
+};
+
+DialogSystem.createDialog = function() {
+    return $('<div></div>').addClass("dialog-frame");
+};
+
diff --git a/src/main/webapp/styles/common.css b/src/main/webapp/styles/common.css
index 0bebb5fed..6b164bfa4 100644
--- a/src/main/webapp/styles/common.css
+++ b/src/main/webapp/styles/common.css
@@ -89,3 +89,64 @@ a.menu-item:hover {
 a.menu-item img {
     border: none;
 }
+
+.dialog-overlay {
+    background: black;
+    opacity: 0.3;
+    position: fixed;
+    padding: 0px;
+    margin: 0px;
+    top: 0px;
+    left: 0px;
+    width: 100%;
+    height: 100%;
+}
+
+.dialog-overlay2 {
+    position: fixed;
+    padding: 0px;
+    margin: 0px;
+    top: 0px;
+    left: 0px;
+    width: 100%;
+    height: 100%;
+    background: black;
+    opacity: 0.01;
+}
+
+.dialog-container {
+    position: fixed;
+    padding: 0px;
+    margin: 0px;
+    left: 0px;
+    width: 100%;
+    text-align: center;
+}
+
+.dialog-frame {
+    margin: 0 auto;
+    text-align: left;
+    background: white;
+    border: 1px solid #aaa;
+    padding: 2px;
+}
+
+.dialog-header {
+    background: #ccc;
+    padding: 5px 10px;
+    font-weight: bold;
+}
+
+.dialog-body {
+    padding: 10px;
+}
+
+.dialog-footer {
+    background: #ddd;
+    padding: 5px 10px;
+    text-align: right;
+}
+
+.dialog-footer button {
+    margin-left: 5px;
+}
\ No newline at end of file
diff --git a/src/main/webapp/styles/process.css b/src/main/webapp/styles/process.css
index 90923fef7..7c89b2f51 100644
--- a/src/main/webapp/styles/process.css
+++ b/src/main/webapp/styles/process.css
@@ -12,4 +12,8 @@
     background: #fffee0;
     margin: 0 auto;
     text-align: left;
+}
+
+.fbs-pane, .fbs-flyout-pane {
+    z-index: 200;
 }
\ No newline at end of file