diff --git a/app.coffee b/app.coffee
index 9f54f4a..6a8d73f 100644
--- a/app.coffee
+++ b/app.coffee
@@ -42,8 +42,8 @@ app.param 'project_id', (req, res, next, project_id) ->
 	else
 		next new Error("invalid project id")
 
-app.param 'user_id', (req, res, next, project_id) ->
-	if project_id?.match /^[a-zA-Z0-9_-]+$/
+app.param 'user_id', (req, res, next, user_id) ->
+	if user_id?.match /^[0-9a-f]{24}$/
 		next()
 	else
 		next new Error("invalid user id")
@@ -63,6 +63,14 @@ app.get  "/project/:project_id/sync/pdf", CompileController.syncFromPdf
 app.get  "/project/:project_id/wordcount", CompileController.wordcount
 app.get  "/project/:project_id/status", CompileController.status
 
+# Per-user containers
+app.post   "/project/:project_id/user/:user_id/compile", bodyParser.json(limit: "5mb"), CompileController.compile
+app.delete "/project/:project_id/user/:user_id", CompileController.clearCache
+
+app.get  "/project/:project_id/user/:user_id/sync/code", CompileController.syncFromCode
+app.get  "/project/:project_id/user/:user_id/sync/pdf", CompileController.syncFromPdf
+app.get  "/project/:project_id/user/:user_id/wordcount", CompileController.wordcount
+
 ForbidSymlinks = require "./app/js/StaticServerForbidSymlinks"
 
 # create a static server which does not allow access to any symlinks
diff --git a/app/coffee/CompileController.coffee b/app/coffee/CompileController.coffee
index 478d91b..d4dddd4 100644
--- a/app/coffee/CompileController.coffee
+++ b/app/coffee/CompileController.coffee
@@ -11,6 +11,7 @@ module.exports = CompileController =
 		RequestParser.parse req.body, (error, request) ->
 			return next(error) if error?
 			request.project_id = req.params.project_id
+			request.user_id = req.params.user_id if req.params.user_id?
 			ProjectPersistenceManager.markProjectAsJustAccessed request.project_id, (error) ->
 				return next(error) if error?
 				CompileManager.doCompile request, (error, outputFiles = []) ->
@@ -35,6 +36,7 @@ module.exports = CompileController =
 							outputFiles: outputFiles.map (file) ->
 								url:
 									"#{Settings.apis.clsi.url}/project/#{request.project_id}" +
+									(if request.user_id? then "/user/#{request.user_id}" else "") +
 									(if file.build? then "/build/#{file.build}" else "") +
 									"/output/#{file.path}"
 								path: file.path
@@ -43,7 +45,7 @@ module.exports = CompileController =
 					}
 		
 	clearCache: (req, res, next = (error) ->) ->
-		ProjectPersistenceManager.clearProject req.params.project_id, (error) ->
+		ProjectPersistenceManager.clearProject req.params.project_id, req.params.user_id, (error) ->
 			return next(error) if error?
 			res.sendStatus(204) # No content
 
@@ -52,8 +54,9 @@ module.exports = CompileController =
 		line   = parseInt(req.query.line, 10)
 		column = parseInt(req.query.column, 10)
 		project_id = req.params.project_id
+		user_id = req.params.user_id
 
-		CompileManager.syncFromCode project_id, file, line, column, (error, pdfPositions) ->
+		CompileManager.syncFromCode project_id, user_id, file, line, column, (error, pdfPositions) ->
 			return next(error) if error?
 			res.send JSON.stringify {
 				pdf: pdfPositions
@@ -64,8 +67,9 @@ module.exports = CompileController =
 		h      = parseFloat(req.query.h)
 		v      = parseFloat(req.query.v)
 		project_id = req.params.project_id
+		user_id = req.params.user_id
 
-		CompileManager.syncFromPdf project_id, page, h, v, (error, codePositions) ->
+		CompileManager.syncFromPdf project_id, user_id, page, h, v, (error, codePositions) ->
 			return next(error) if error?
 			res.send JSON.stringify {
 				code: codePositions
@@ -74,10 +78,11 @@ module.exports = CompileController =
 	wordcount: (req, res, next = (error) ->) ->
 		file   = req.query.file || "main.tex"
 		project_id = req.params.project_id
+		user_id = req.params.user_id
 		image = req.query.image
 		logger.log {image, file, project_id}, "word count request"
 
-		CompileManager.wordcount project_id, file, image, (error, result) ->
+		CompileManager.wordcount project_id, user_id, file, image, (error, result) ->
 			return next(error) if error?
 			res.send JSON.stringify {
 				texcount: result
diff --git a/app/coffee/CompileManager.coffee b/app/coffee/CompileManager.coffee
index 41377ab..bb93dbd 100644
--- a/app/coffee/CompileManager.coffee
+++ b/app/coffee/CompileManager.coffee
@@ -9,23 +9,31 @@ Metrics = require "./Metrics"
 child_process = require "child_process"
 DraftModeManager = require "./DraftModeManager"
 fs = require("fs")
+fse = require "fs-extra"
 os = require("os")
+async = require "async"
 
 commandRunner = Settings.clsi?.commandRunner or "./CommandRunner"
 logger.info commandRunner:commandRunner, "selecting command runner for clsi"
 CommandRunner = require(commandRunner)
 
+getCompileName = (project_id, user_id) ->
+	if user_id? then "#{project_id}-#{user_id}" else project_id
+
+getCompileDir = (project_id, user_id) ->
+	Path.join(Settings.path.compilesDir, getCompileName(project_id, user_id))
+
 module.exports = CompileManager =
 	doCompile: (request, callback = (error, outputFiles) ->) ->
-		compileDir = Path.join(Settings.path.compilesDir, request.project_id)
+		compileDir = getCompileDir(request.project_id, request.user_id)
 
 		timer = new Metrics.Timer("write-to-disk")
-		logger.log project_id: request.project_id, "starting doCompile"
+		logger.log project_id: request.project_id, user_id: request.user_id, "starting compile"
 		ResourceWriter.syncResourcesToDisk request.project_id, request.resources, compileDir, (error) ->
 			if error?
-				logger.err err:error, project_id: request.project_id, "error writing resources to disk"
+				logger.err err:error, project_id: request.project_id, user_id: request.user_id, "error writing resources to disk"
 				return callback(error) 
-			logger.log project_id: request.project_id, time_taken: Date.now() - timer.start, "written files to disk"
+			logger.log project_id: request.project_id, user_id: request.user_id, time_taken: Date.now() - timer.start, "written files to disk"
 			timer.done()
 			
 			injectDraftModeIfRequired = (callback) ->
@@ -42,7 +50,8 @@ module.exports = CompileManager =
 				tag = "other" if not request.project_id.match(/^[0-9a-f]{24}$/) # exclude smoke test
 				Metrics.inc("compiles")
 				Metrics.inc("compiles-with-image.#{tag}")
-				LatexRunner.runLatex request.project_id, {
+				compileName = getCompileName(request.project_id, request.user_id)
+				LatexRunner.runLatex compileName, {
 					directory: compileDir
 					mainFile:  request.rootResourcePath
 					compiler:  request.compiler
@@ -58,7 +67,7 @@ module.exports = CompileManager =
 					loadavg = os.loadavg?()
 					Metrics.gauge("load-avg", loadavg[0]) if loadavg?
 					ts = timer.done()
-					logger.log {project_id: request.project_id, time_taken: ts, stats:stats, timings:timings, loadavg:loadavg}, "done compile"
+					logger.log {project_id: request.project_id, user_id: request.user_id, time_taken: ts, stats:stats, timings:timings, loadavg:loadavg}, "done compile"
 					if stats?["latex-runs"] > 0
 						Metrics.timing("run-compile-per-pass", ts / stats["latex-runs"])
 					if stats?["latex-runs"] > 0 and timings?["cpu-time"] > 0
@@ -69,12 +78,12 @@ module.exports = CompileManager =
 						OutputCacheManager.saveOutputFiles outputFiles, compileDir,  (error, newOutputFiles) ->
 							callback null, newOutputFiles
 	
-	clearProject: (project_id, _callback = (error) ->) ->
+	clearProject: (project_id, user_id, _callback = (error) ->) ->
 		callback = (error) ->
 			_callback(error)
 			_callback = () ->
 
-		compileDir = Path.join(Settings.path.compilesDir, project_id)
+		compileDir = getCompileDir(project_id, user_id)
 
 		CompileManager._checkDirectory compileDir, (err, exists) ->
 			return callback(err) if err?
@@ -93,6 +102,27 @@ module.exports = CompileManager =
 				else
 					return callback(new Error("rm -r #{compileDir} failed: #{stderr}"))
 
+	_findAllDirs: (callback = (error, allDirs) ->) ->
+		root = Settings.path.compilesDir
+		fs.readdir root, (err, files) ->
+			return callback(err) if err?
+			allDirs = (Path.join(root, file) for file in files)
+			callback(null, allDirs)
+
+	clearExpiredProjects: (max_cache_age_ms, callback = (error) ->) ->
+		now = Date.now()
+		# action for each directory
+		expireIfNeeded = (checkDir, cb) ->
+			fs.stat checkDir, (err, stats) ->
+				return cb() if err?  # ignore errors checking directory
+				age = now - stats.mtime
+				hasExpired = (age > max_cache_age_ms)
+				if hasExpired then fse.remove(checkDir, cb) else cb()
+		# iterate over all project directories
+		CompileManager._findAllDirs (error, allDirs) ->
+			return callback() if error?
+			async.eachSeries allDirs, expireIfNeeded,	callback
+
 	_checkDirectory: (compileDir, callback = (error, exists) ->) ->
 		fs.lstat compileDir, (err, stats) ->
 			if err?.code is 'ENOENT'
@@ -106,24 +136,28 @@ module.exports = CompileManager =
 			else
 				callback(null, true) # directory exists
 
-	syncFromCode: (project_id, file_name, line, column, callback = (error, pdfPositions) ->) ->
+	syncFromCode: (project_id, user_id, file_name, line, column, callback = (error, pdfPositions) ->) ->
 		# If LaTeX was run in a virtual environment, the file path that synctex expects
 		# might not match the file path on the host. The .synctex.gz file however, will be accessed
 		# wherever it is on the host.
-		base_dir = Settings.path.synctexBaseDir(project_id)
+		compileName = getCompileName(project_id, user_id)
+		base_dir = Settings.path.synctexBaseDir(compileName)
 		file_path = base_dir + "/" + file_name
-		synctex_path = Path.join(Settings.path.compilesDir, project_id, "output.pdf")
+		compileDir = getCompileDir(project_id, user_id)
+		synctex_path = Path.join(compileDir, "output.pdf")
 		CompileManager._runSynctex ["code", synctex_path, file_path, line, column], (error, stdout) ->
 			return callback(error) if error?
-			logger.log project_id: project_id, file_name: file_name, line: line, column: column, stdout: stdout, "synctex code output"
+			logger.log project_id: project_id, user_id:user_id, file_name: file_name, line: line, column: column, stdout: stdout, "synctex code output"
 			callback null, CompileManager._parseSynctexFromCodeOutput(stdout)
 
-	syncFromPdf: (project_id, page, h, v, callback = (error, filePositions) ->) ->
-		base_dir = Settings.path.synctexBaseDir(project_id)
-		synctex_path = Path.join(Settings.path.compilesDir, project_id, "output.pdf")
+	syncFromPdf: (project_id, user_id, page, h, v, callback = (error, filePositions) ->) ->
+		compileName = getCompileName(project_id, user_id)
+		base_dir = Settings.path.synctexBaseDir(compileName)
+		compileDir = getCompileDir(project_id, user_id)
+		synctex_path = Path.join(compileDir, "output.pdf")
 		CompileManager._runSynctex ["pdf", synctex_path, page, h, v], (error, stdout) ->
 			return callback(error) if error?
-			logger.log project_id: project_id, page: page, h: h, v:v, stdout: stdout, "synctex pdf output"
+			logger.log project_id: project_id, user_id:user_id, page: page, h: h, v:v, stdout: stdout, "synctex pdf output"
 			callback null, CompileManager._parseSynctexFromPdfOutput(stdout, base_dir)
 
 	_runSynctex: (args, callback = (error, stdout) ->) ->
@@ -162,19 +196,20 @@ module.exports = CompileManager =
 				}
 		return results
 
-	wordcount: (project_id, file_name, image, callback = (error, pdfPositions) ->) ->
-		logger.log project_id:project_id, file_name:file_name, image:image, "running wordcount"
+	wordcount: (project_id, user_id, file_name, image, callback = (error, pdfPositions) ->) ->
+		logger.log project_id:project_id, user_id:user_id, file_name:file_name, image:image, "running wordcount"
 		file_path = "$COMPILE_DIR/" + file_name
 		command = [ "texcount", '-inc', file_path, "-out=" + file_path + ".wc"]
-		directory = Path.join(Settings.path.compilesDir, project_id)
+		directory = getCompileDir(project_id, user_id)
 		timeout = 10 * 1000
+		compileName = getCompileName(project_id, user_id)
 
-		CommandRunner.run project_id, command, directory, image, timeout, (error) ->
+		CommandRunner.run compileName, command, directory, image, timeout, (error) ->
 			return callback(error) if error?
 			try
 				stdout = fs.readFileSync(directory + "/" + file_name + ".wc", "utf-8")
 			catch err
-				logger.err err:err, command:command, directory:directory, project_id:project_id, "error reading word count output"
+				logger.err err:err, command:command, directory:directory, project_id:project_id, user_id:user_id, "error reading word count output"
 				return callback(err)
 			callback null, CompileManager._parseWordcountFromOutput(stdout)
 
diff --git a/app/coffee/ProjectPersistenceManager.coffee b/app/coffee/ProjectPersistenceManager.coffee
index f70f43c..403043f 100644
--- a/app/coffee/ProjectPersistenceManager.coffee
+++ b/app/coffee/ProjectPersistenceManager.coffee
@@ -27,21 +27,30 @@ module.exports = ProjectPersistenceManager =
 			jobs = for project_id in (project_ids or [])
 				do (project_id) ->
 					(callback) ->
-						ProjectPersistenceManager.clearProject project_id, (err) ->
+						ProjectPersistenceManager.clearProjectFromCache project_id, (err) ->
 							if err?
 								logger.error err: err, project_id: project_id, "error clearing project"
 							callback()
-			async.series jobs, callback
-
-	clearProject: (project_id, callback = (error) ->) ->
-		logger.log project_id: project_id, "clearing project"
-		CompileManager.clearProject project_id, (error) ->
-			return callback(error) if error?
-			UrlCache.clearProject project_id, (error) ->
+			async.series jobs, (error) ->
 				return callback(error) if error?
-				ProjectPersistenceManager._clearProjectFromDatabase project_id, (error) ->
-					return callback(error) if error?
-					callback()
+				CompileManager.clearExpiredProjects ProjectPersistenceManager.EXPIRY_TIMEOUT, (error) ->
+					callback() # ignore any errors from deleting directories
+
+	clearProject: (project_id, user_id, callback = (error) ->) ->
+		logger.log project_id: project_id, user_id:user_id, "clearing project for user"
+		CompileManager.clearProject project_id, user_id, (error) ->
+			return callback(error) if error?
+			ProjectPersistenceManager.clearProjectFromCache project_id, (error) ->
+				return callback(error) if error?
+				callback()
+
+	clearProjectFromCache: (project_id, callback = (error) ->) ->
+		logger.log project_id: project_id, "clearing project from cache"
+		UrlCache.clearProject project_id, (error) ->
+			return callback(error) if error?
+			ProjectPersistenceManager._clearProjectFromDatabase project_id, (error) ->
+				return callback(error) if error?
+				callback()
 
 	_clearProjectFromDatabase: (project_id, callback = (error) ->) ->
 		db.Project.destroy(where: {project_id: project_id})
@@ -54,5 +63,4 @@ module.exports = ProjectPersistenceManager =
 				callback null, projects.map((project) -> project.project_id)
 			).error callback
 
-
 logger.log {EXPIRY_TIMEOUT: ProjectPersistenceManager.EXPIRY_TIMEOUT}, "project assets kept timeout"
diff --git a/test/unit/coffee/CompileControllerTests.coffee b/test/unit/coffee/CompileControllerTests.coffee
index 7693799..1fc6a99 100644
--- a/test/unit/coffee/CompileControllerTests.coffee
+++ b/test/unit/coffee/CompileControllerTests.coffee
@@ -146,12 +146,12 @@ describe "CompileController", ->
 				column: @column.toString()
 			@res.send = sinon.stub()
 
-			@CompileManager.syncFromCode = sinon.stub().callsArgWith(4, null, @pdfPositions = ["mock-positions"])
+			@CompileManager.syncFromCode = sinon.stub().callsArgWith(5, null, @pdfPositions = ["mock-positions"])
 			@CompileController.syncFromCode @req, @res, @next
 
 		it "should find the corresponding location in the PDF", ->
 			@CompileManager.syncFromCode
-				.calledWith(@project_id, @file, @line, @column)
+				.calledWith(@project_id, undefined, @file, @line, @column)
 				.should.equal true
 
 		it "should return the positions", ->
@@ -175,12 +175,12 @@ describe "CompileController", ->
 				v: @v.toString()
 			@res.send = sinon.stub()
 
-			@CompileManager.syncFromPdf = sinon.stub().callsArgWith(4, null, @codePositions = ["mock-positions"])
+			@CompileManager.syncFromPdf = sinon.stub().callsArgWith(5, null, @codePositions = ["mock-positions"])
 			@CompileController.syncFromPdf @req, @res, @next
 
 		it "should find the corresponding location in the code", ->
 			@CompileManager.syncFromPdf
-				.calledWith(@project_id, @page, @h, @v)
+				.calledWith(@project_id, undefined, @page, @h, @v)
 				.should.equal true
 
 		it "should return the positions", ->
@@ -201,12 +201,12 @@ describe "CompileController", ->
 				image: @image = "example.com/image"
 			@res.send = sinon.stub()
 
-			@CompileManager.wordcount = sinon.stub().callsArgWith(3, null, @texcount = ["mock-texcount"])
+			@CompileManager.wordcount = sinon.stub().callsArgWith(4, null, @texcount = ["mock-texcount"])
 			@CompileController.wordcount @req, @res, @next
 
 		it "should return the word count of a file", ->
 			@CompileManager.wordcount
-				.calledWith(@project_id, @file, @image)
+				.calledWith(@project_id, undefined, @file, @image)
 				.should.equal true
 
 		it "should return the texcount info", ->
diff --git a/test/unit/coffee/CompileManagerTests.coffee b/test/unit/coffee/CompileManagerTests.coffee
index 55f5cc5..611ed11 100644
--- a/test/unit/coffee/CompileManagerTests.coffee
+++ b/test/unit/coffee/CompileManagerTests.coffee
@@ -43,11 +43,12 @@ describe "CompileManager", ->
 				resources: @resources = "mock-resources"
 				rootResourcePath: @rootResourcePath = "main.tex"
 				project_id: @project_id = "project-id-123"
+				user_id: @user_id = "1234"
 				compiler: @compiler = "pdflatex"
 				timeout: @timeout = 42000
 				imageName: @image = "example.com/image"
 			@Settings.compileDir = "compiles"
-			@compileDir = "#{@Settings.path.compilesDir}/#{@project_id}"
+			@compileDir = "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}"
 			@ResourceWriter.syncResourcesToDisk = sinon.stub().callsArg(3)
 			@LatexRunner.runLatex = sinon.stub().callsArg(2)
 			@OutputFileFinder.findOutputFiles = sinon.stub().callsArgWith(2, null, @output_files)
@@ -65,7 +66,7 @@ describe "CompileManager", ->
 
 			it "should run LaTeX", ->
 				@LatexRunner.runLatex
-					.calledWith(@project_id, {
+					.calledWith("#{@project_id}-#{@user_id}", {
 						directory: @compileDir
 						mainFile:  @rootResourcePath
 						compiler:  @compiler
@@ -104,12 +105,12 @@ describe "CompileManager", ->
 				@proc.stdout = new EventEmitter()
 				@proc.stderr = new EventEmitter()
 				@child_process.spawn = sinon.stub().returns(@proc)
-				@CompileManager.clearProject @project_id, @callback
+				@CompileManager.clearProject @project_id, @user_id, @callback
 				@proc.emit "close", 0
 
 			it "should remove the project directory", ->
 				@child_process.spawn
-					.calledWith("rm", ["-r", "#{@Settings.path.compilesDir}/#{@project_id}"])
+					.calledWith("rm", ["-r", "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}"])
 					.should.equal true
 
 			it "should call the callback", ->
@@ -123,13 +124,13 @@ describe "CompileManager", ->
 				@proc.stdout = new EventEmitter()
 				@proc.stderr = new EventEmitter()
 				@child_process.spawn = sinon.stub().returns(@proc)
-				@CompileManager.clearProject @project_id, @callback
+				@CompileManager.clearProject @project_id, @user_id, @callback
 				@proc.stderr.emit "data", @error = "oops"
 				@proc.emit "close", 1
 
 			it "should remove the project directory", ->
 				@child_process.spawn
-					.calledWith("rm", ["-r", "#{@Settings.path.compilesDir}/#{@project_id}"])
+					.calledWith("rm", ["-r", "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}"])
 					.should.equal true
 
 			it "should call the callback with an error from the stderr", ->
@@ -137,7 +138,7 @@ describe "CompileManager", ->
 					.calledWith(new Error())
 					.should.equal true
 
-				@callback.args[0][0].message.should.equal "rm -r #{@Settings.path.compilesDir}/#{@project_id} failed: #{@error}"
+				@callback.args[0][0].message.should.equal "rm -r #{@Settings.path.compilesDir}/#{@project_id}-#{@user_id} failed: #{@error}"
 
 	describe "syncing", ->
 		beforeEach ->
@@ -150,17 +151,17 @@ describe "CompileManager", ->
 			@column = 3
 			@file_name = "main.tex"
 			@child_process.execFile = sinon.stub()
-			@Settings.path.synctexBaseDir = (project_id) => "#{@Settings.path.compilesDir}/#{@project_id}"
+			@Settings.path.synctexBaseDir = (project_id) => "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}"
 
 		describe "syncFromCode", ->
 			beforeEach ->
 				@child_process.execFile.callsArgWith(3, null, @stdout = "NODE\t#{@page}\t#{@h}\t#{@v}\t#{@width}\t#{@height}\n", "")
-				@CompileManager.syncFromCode @project_id, @file_name, @line, @column, @callback
+				@CompileManager.syncFromCode @project_id, @user_id, @file_name, @line, @column, @callback
 
 			it "should execute the synctex binary", ->
 				bin_path = Path.resolve(__dirname + "/../../../bin/synctex")
-				synctex_path = "#{@Settings.path.compilesDir}/#{@project_id}/output.pdf"
-				file_path = "#{@Settings.path.compilesDir}/#{@project_id}/#{@file_name}"
+				synctex_path = "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}/output.pdf"
+				file_path = "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}/#{@file_name}"
 				@child_process.execFile
 					.calledWith(bin_path, ["code", synctex_path, file_path, @line, @column], timeout: 10000)
 					.should.equal true
@@ -178,12 +179,12 @@ describe "CompileManager", ->
 
 		describe "syncFromPdf", ->
 			beforeEach ->
-				@child_process.execFile.callsArgWith(3, null, @stdout = "NODE\t#{@Settings.path.compilesDir}/#{@project_id}/#{@file_name}\t#{@line}\t#{@column}\n", "")
-				@CompileManager.syncFromPdf @project_id, @page, @h, @v, @callback
+				@child_process.execFile.callsArgWith(3, null, @stdout = "NODE\t#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}/#{@file_name}\t#{@line}\t#{@column}\n", "")
+				@CompileManager.syncFromPdf @project_id, @user_id, @page, @h, @v, @callback
 
 			it "should execute the synctex binary", ->
 				bin_path = Path.resolve(__dirname + "/../../../bin/synctex")
-				synctex_path = "#{@Settings.path.compilesDir}/#{@project_id}/output.pdf"
+				synctex_path = "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}/output.pdf"
 				@child_process.execFile
 					.calledWith(bin_path, ["pdf", synctex_path, @page, @h, @v], timeout: 10000)
 					.should.equal true
@@ -209,15 +210,15 @@ describe "CompileManager", ->
 			@Settings.path.compilesDir = "/local/compile/directory"
 			@image = "example.com/image"
 
-			@CompileManager.wordcount @project_id, @file_name, @image, @callback
+			@CompileManager.wordcount @project_id, @user_id, @file_name, @image, @callback
 
 		it "should run the texcount command", ->
-			@directory = "#{@Settings.path.compilesDir}/#{@project_id}"
+			@directory = "#{@Settings.path.compilesDir}/#{@project_id}-#{@user_id}"
 			@file_path = "$COMPILE_DIR/#{@file_name}"
 			@command =[ "texcount", "-inc", @file_path, "-out=" + @file_path + ".wc"]
 			
 			@CommandRunner.run
-				.calledWith(@project_id, @command, @directory, @image, @timeout)
+				.calledWith("#{@project_id}-#{@user_id}", @command, @directory, @image, @timeout)
 				.should.equal true
 
 		it "should call the callback with the parsed output", ->
diff --git a/test/unit/coffee/ProjectPersistenceManagerTests.coffee b/test/unit/coffee/ProjectPersistenceManagerTests.coffee
index f8c78ef..69bfd4f 100644
--- a/test/unit/coffee/ProjectPersistenceManagerTests.coffee
+++ b/test/unit/coffee/ProjectPersistenceManagerTests.coffee
@@ -13,6 +13,7 @@ describe "ProjectPersistenceManager", ->
 			"./db": @db = {}
 		@callback = sinon.stub()
 		@project_id = "project-id-123"
+		@user_id = "1234"
 
 	describe "clearExpiredProjects", ->
 		beforeEach ->
@@ -21,12 +22,13 @@ describe "ProjectPersistenceManager", ->
 				"project-id-2"
 			]
 			@ProjectPersistenceManager._findExpiredProjectIds = sinon.stub().callsArgWith(0, null, @project_ids)
-			@ProjectPersistenceManager.clearProject = sinon.stub().callsArg(1)
+			@ProjectPersistenceManager.clearProjectFromCache = sinon.stub().callsArg(1)
+			@CompileManager.clearExpiredProjects = sinon.stub().callsArg(1)
 			@ProjectPersistenceManager.clearExpiredProjects @callback
 
 		it "should clear each expired project", ->
 			for project_id in @project_ids
-				@ProjectPersistenceManager.clearProject
+				@ProjectPersistenceManager.clearProjectFromCache
 					.calledWith(project_id)
 					.should.equal true
 
@@ -37,8 +39,8 @@ describe "ProjectPersistenceManager", ->
 		beforeEach ->
 			@ProjectPersistenceManager._clearProjectFromDatabase = sinon.stub().callsArg(1)
 			@UrlCache.clearProject = sinon.stub().callsArg(1)
-			@CompileManager.clearProject = sinon.stub().callsArg(1)
-			@ProjectPersistenceManager.clearProject @project_id, @callback
+			@CompileManager.clearProject = sinon.stub().callsArg(2)
+			@ProjectPersistenceManager.clearProject @project_id, @user_id, @callback
 
 		it "should clear the project from the database", ->
 			@ProjectPersistenceManager._clearProjectFromDatabase
@@ -52,7 +54,7 @@ describe "ProjectPersistenceManager", ->
 
 		it "should clear the project compile folder", ->
 			@CompileManager.clearProject
-				.calledWith(@project_id)
+				.calledWith(@project_id, @user_id)
 				.should.equal true
 
 		it "should call the callback", ->