diff --git a/InvenTree/InvenTree/settings.py b/InvenTree/InvenTree/settings.py
index ab2205a296..975af8c20b 100644
--- a/InvenTree/InvenTree/settings.py
+++ b/InvenTree/InvenTree/settings.py
@@ -32,6 +32,7 @@ ALLOWED_HOSTS = []
 # Application definition
 
 INSTALLED_APPS = [
+    'django_filters',
     'rest_framework',
 
     # Core django modules
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index c479037743..5afa01a293 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -95,13 +95,8 @@ class PartParameterTemplate(models.Model):
     A PartParameterTemplate can be optionally associated with a PartCategory
     """
     name = models.CharField(max_length=20)
-    description = models.CharField(max_length=100, blank=True)
     units = models.CharField(max_length=10, blank=True)
 
-    default_value = models.CharField(max_length=50, blank=True)
-    default_min = models.CharField(max_length=50, blank=True)
-    default_max = models.CharField(max_length=50, blank=True)
-
     # Parameter format
     PARAM_NUMERIC = 10
     PARAM_TEXT = 20
@@ -143,10 +138,32 @@ class CategoryParameterLink(models.Model):
         verbose_name_plural = "Category Parameters"
 
 
+class PartParameterManager(models.Manager):
+    """ Manager for handling PartParameter objects
+    """
+
+    def create(self, *args, **kwargs):
+        """ Prevent creation of duplicate PartParameter
+        """
+
+        part_id = kwargs['part']
+        template_id = kwargs['template']
+
+        try:
+            params = self.filter(part=part_id, template=template_id)
+            return params[0]
+        except:
+            pass
+
+        return super(PartParameterManager, self).create(*args, **kwargs)
+
+
 class PartParameter(models.Model):
     """ PartParameter is associated with a single part
     """
 
+    objects = PartParameterManager()
+
     part = models.ForeignKey(Part, on_delete=models.CASCADE, related_name='parameters')
     template = models.ForeignKey(PartParameterTemplate)
 
@@ -155,17 +172,6 @@ class PartParameter(models.Model):
     min_value = models.CharField(max_length=50, blank=True)
     max_value = models.CharField(max_length=50, blank=True)
 
-    # Prevent multiple parameters of the same template
-    # from being added to the same part
-    def save(self, *args, **kwargs):
-        params = PartParameter.objects.filter(part=self.part, template=self.template)
-        if len(params) > 1:
-            return
-        if len(params) == 1 and params[0].id != self.id:
-            return
-
-        super(PartParameter, self).save(*args, **kwargs)
-
     def __str__(self):
         return "{name} : {val}{units}".format(
             name=self.template.name,
diff --git a/InvenTree/part/serializers.py b/InvenTree/part/serializers.py
index 774815ac1a..06ad724b50 100644
--- a/InvenTree/part/serializers.py
+++ b/InvenTree/part/serializers.py
@@ -1,6 +1,6 @@
 from rest_framework import serializers
 
-from .models import Part, PartCategory, PartParameter
+from .models import Part, PartCategory, PartParameter, PartParameterTemplate
 
 
 class PartParameterSerializer(serializers.ModelSerializer):
@@ -58,3 +58,13 @@ class PartCategoryDetailSerializer(serializers.ModelSerializer):
                   'path',
                   'children',
                   'parts')
+
+
+class PartTemplateSerializer(serializers.ModelSerializer):
+
+    class Meta:
+        model = PartParameterTemplate
+        fields = ('pk',
+                  'name',
+                  'units',
+                  'format')
diff --git a/InvenTree/part/urls.py b/InvenTree/part/urls.py
index 01db39c149..b351ce3eda 100644
--- a/InvenTree/part/urls.py
+++ b/InvenTree/part/urls.py
@@ -16,16 +16,24 @@ categorypatterns = [
     url(r'^$', views.PartCategoryList.as_view())
 ]
 
-""" URL patterns associated with a particular part:
-/part/<pk>              -> Detail view of a given part
-/part/<pk>/parameters   -> List parameters associated with a part
-"""
-partdetailpatterns = [
-    # Single part detail
-    url(r'^$', views.PartDetail.as_view()),
+partparampatterns = [
+    # Detail of a single part parameter
+    url(r'^(?P<pk>[0-9]+)/$', views.PartParamDetail.as_view()),
+
+    # Parameters associated with a particular part
+    url(r'^\?[^/]*/$', views.PartParamList.as_view()),
+
+    # All part parameters
+    url(r'^$', views.PartParamList.as_view()),
+]
+
+parttemplatepatterns = [
+    # Detail of a single part field template
+    url(r'^(?P<pk>[0-9]+)/$', views.PartTemplateDetail.as_view()),
+
+    # List all part field templates
+    url(r'^$', views.PartTemplateList.as_view())
 
-    # View part parameters
-    url(r'parameters/$', views.PartParameters.as_view())
 ]
 
 """ Top-level URL patterns for the Part app:
@@ -36,11 +44,17 @@ partdetailpatterns = [
 """
 urlpatterns = [
     # Individual part
-    url(r'^(?P<pk>[0-9]+)/', include(partdetailpatterns)),
+    url(r'^(?P<pk>[0-9]+)/$', views.PartDetail.as_view()),
 
     # Part categories
     url(r'^category/', views.PartCategoryList.as_view()),
 
-    # List of all parts
-    url(r'^$', views.PartList.as_view())
+    # Part parameters
+    url(r'^parameters/', include(partparampatterns)),
+
+    # Part templates
+    url(r'^templates/', include(parttemplatepatterns)),
+
+    # List parts with optional filters
+    url(r'^\?*[^/]*/?$', views.PartList.as_view()),
 ]
diff --git a/InvenTree/part/views.py b/InvenTree/part/views.py
index 55d5255789..c4646b6a6e 100644
--- a/InvenTree/part/views.py
+++ b/InvenTree/part/views.py
@@ -1,9 +1,12 @@
+# import django_filters
+
 from rest_framework import generics, permissions
 
-from .models import PartCategory, Part, PartParameter
+from .models import PartCategory, Part, PartParameter, PartParameterTemplate
 from .serializers import PartSerializer
 from .serializers import PartCategoryDetailSerializer
 from .serializers import PartParameterSerializer
+from .serializers import PartTemplateSerializer
 
 
 class PartDetail(generics.RetrieveUpdateDestroyAPIView):
@@ -14,25 +17,69 @@ class PartDetail(generics.RetrieveUpdateDestroyAPIView):
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
 
-class PartParameters(generics.ListCreateAPIView):
+class PartParamList(generics.ListCreateAPIView):
     """ Return all parameters associated with a particular part
     """
     def get_queryset(self):
-        part_id = self.kwargs['pk']
-        return PartParameter.objects.filter(part=part_id)
+        part_id = self.request.query_params.get('part', None)
+
+        if part_id:
+            return PartParameter.objects.filter(part=part_id)
+        else:
+            return PartParameter.objects.all()
 
     serializer_class = PartParameterSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
+    def create(self, request, *args, **kwargs):
+        # Ensure part link is set correctly
+        part_id = self.request.query_params.get('part', None)
+        if part_id:
+            request.data['part'] = part_id
+        return super(PartParamList, self).create(request, *args, **kwargs)
+
+
+class PartParamDetail(generics.RetrieveUpdateDestroyAPIView):
+    """ Detail view of a single PartParameter
+    """
+
+    queryset = PartParameter.objects.all()
+    serializer_class = PartParameterSerializer
+    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
+
+
+"""
+class PartFilter(django_filters.rest_framework.FilterSet):
+    min_stock = django_filters.NumberFilter(name="stock", lookup_expr="gte")
+    max_stock = django_filters.NumberFilter(name="stock", lookup_expr="lte")
+
+    class Meta:
+        model = Part
+        fields = ['stock']
+"""
+
 
 class PartList(generics.ListCreateAPIView):
+    """ Display a list of parts, with optional filters
+    Filters are specified in the url, e.g.
+    /part/?category=127
+    /part/?min_stock=100
+    """
+
+    def get_queryset(self):
+        parts = Part.objects.all()
+
+        cat_id = self.request.query_params.get('category', None)
+        if cat_id:
+            parts = parts.filter(category=cat_id)
+
+        return parts
 
-    queryset = Part.objects.all()
     serializer_class = PartSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
 
-class PartCategoryDetail(generics.RetrieveUpdateAPIView):
+class PartCategoryDetail(generics.RetrieveUpdateDestroyAPIView):
     """ Return information on a single PartCategory
     """
     queryset = PartCategory.objects.all()
@@ -47,3 +94,17 @@ class PartCategoryList(generics.ListCreateAPIView):
     queryset = PartCategory.objects.filter(parent=None)
     serializer_class = PartCategoryDetailSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
+
+
+class PartTemplateDetail(generics.RetrieveUpdateDestroyAPIView):
+
+    queryset = PartParameterTemplate.objects.all()
+    serializer_class = PartTemplateSerializer
+    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
+
+
+class PartTemplateList(generics.ListCreateAPIView):
+
+    queryset = PartParameterTemplate.objects.all()
+    serializer_class = PartTemplateSerializer
+    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
diff --git a/InvenTree/project/models.py b/InvenTree/project/models.py
index bf2bd42368..0b063af036 100644
--- a/InvenTree/project/models.py
+++ b/InvenTree/project/models.py
@@ -41,12 +41,38 @@ class Project(models.Model):
         return self.projectpart_set.all()
 
 
+class ProjectPartManager(models.Manager):
+    """ Manager for handling ProjectParts
+    """
+
+    def create(self, *args, **kwargs):
+        """ Test for validity of new ProjectPart before actually creating it.
+        If a ProjectPart already exists that references the same:
+        a) Part
+        b) Project
+        then return THAT project instead.
+        """
+
+        project_id = kwargs['project']
+        part_id = kwargs['part']
+
+        try:
+            project_parts = self.filter(project=project_id, part=part_id)
+            return project_parts[0]
+        except:
+            pass
+
+        return super(ProjectPartManager, self).create(*args, **kwargs)
+
+
 class ProjectPart(models.Model):
     """ A project part associates a single part with a project
     The quantity of parts required for a single-run of that project is stored.
     The overage is the number of extra parts that are generally used for a single run.
     """
 
+    objects = ProjectPartManager()
+
     part = models.ForeignKey(Part, on_delete=models.CASCADE)
     project = models.ForeignKey(Project, on_delete=models.CASCADE)
     quantity = models.PositiveIntegerField(default=1)
diff --git a/InvenTree/project/urls.py b/InvenTree/project/urls.py
index 1dd0fba554..27c7ab2f0b 100644
--- a/InvenTree/project/urls.py
+++ b/InvenTree/project/urls.py
@@ -9,9 +9,14 @@ from . import views
 projectdetailpatterns = [
     # Single project detail
     url(r'^$', views.ProjectDetail.as_view()),
+]
 
-    # Parts associated with a project
-    url(r'^parts/$', views.ProjectPartsList.as_view()),
+projectpartpatterns = [
+    # Detail of a single project part
+    url(r'^(?P<pk>[0-9]+)/$', views.ProjectPartDetail.as_view()),
+
+    # List project parts, with optional filters
+    url(r'^\?*[^/]*/?$', views.ProjectPartsList.as_view()),
 ]
 
 projectcategorypatterns = [
@@ -23,7 +28,6 @@ projectcategorypatterns = [
 
     # Create a new category
     url(r'^new/$', views.NewProjectCategory.as_view())
-
 ]
 
 urlpatterns = [
@@ -34,6 +38,9 @@ urlpatterns = [
     # List of all projects
     url(r'^$', views.ProjectList.as_view()),
 
+    # Project parts
+    url(r'^parts/', include(projectpartpatterns)),
+
     # Project categories
     url(r'^category/', include(projectcategorypatterns)),
 ]
diff --git a/InvenTree/project/views.py b/InvenTree/project/views.py
index bb4d415139..923fff27fe 100644
--- a/InvenTree/project/views.py
+++ b/InvenTree/project/views.py
@@ -6,7 +6,9 @@ from .serializers import ProjectCategoryDetailSerializer
 from .serializers import ProjectPartSerializer
 
 
-class ProjectDetail(generics.RetrieveUpdateAPIView):
+class ProjectDetail(generics.RetrieveUpdateDestroyAPIView):
+    """ Project details
+    """
 
     queryset = Project.objects.all()
     serializer_class = ProjectSerializer
@@ -14,6 +16,8 @@ class ProjectDetail(generics.RetrieveUpdateAPIView):
 
 
 class ProjectList(generics.ListCreateAPIView):
+    """ List all projects
+    """
 
     queryset = Project.objects.all()
     serializer_class = ProjectSerializer
@@ -28,6 +32,8 @@ class NewProjectCategory(generics.CreateAPIView):
 
 
 class ProjectCategoryDetail(generics.RetrieveUpdateAPIView):
+    """ Project details
+    """
 
     queryset = ProjectCategory.objects.all()
     serializer_class = ProjectCategoryDetailSerializer
@@ -35,6 +41,9 @@ class ProjectCategoryDetail(generics.RetrieveUpdateAPIView):
 
 
 class ProjectCategoryList(generics.ListCreateAPIView):
+    """ Top-level project categories.
+    Projects are considered top-level if they do not have a parent
+    """
 
     queryset = ProjectCategory.objects.filter(parent=None)
     serializer_class = ProjectCategoryDetailSerializer
@@ -42,10 +51,32 @@ class ProjectCategoryList(generics.ListCreateAPIView):
 
 
 class ProjectPartsList(generics.ListCreateAPIView):
+    """ List all parts associated with a particular project
+    """
 
     serializer_class = ProjectPartSerializer
     permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
 
     def get_queryset(self):
-        project_id = self.kwargs['pk']
-        return ProjectPart.objects.filter(project=project_id)
+        project_id = self.request.query_params.get('project', None)
+
+        if project_id:
+            return ProjectPart.objects.filter(project=project_id)
+        else:
+            return ProjectPart.objects.all()
+
+    def create(self, request, *args, **kwargs):
+        # Ensure project link is set correctly
+        prj_id = self.request.query_params.get('project', None)
+        if prj_id:
+            request.data['project'] = prj_id
+        return super(ProjectPartsList, self).create(request, *args, **kwargs)
+
+
+class ProjectPartDetail(generics.RetrieveUpdateDestroyAPIView):
+    """ Detail for a single project part
+    """
+
+    queryset = ProjectPart.objects.all()
+    serializer_class = ProjectPartSerializer
+    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
diff --git a/InvenTree/stock/urls.py b/InvenTree/stock/urls.py
index a9dc1bc09e..c7a27fe560 100644
--- a/InvenTree/stock/urls.py
+++ b/InvenTree/stock/urls.py
@@ -10,5 +10,6 @@ urlpatterns = [
     url(r'^location/(?P<pk>[0-9]+)$', views.LocationDetail.as_view()),
 
     # List all top-level locations
-    url(r'^location/$', views.LocationList.as_view())
+    url(r'^location/$', views.LocationList.as_view()),
+    url(r'^$', views.LocationList.as_view())
 ]
diff --git a/InvenTree/stock/views.py b/InvenTree/stock/views.py
index 5f76cbebf1..8100abdb92 100644
--- a/InvenTree/stock/views.py
+++ b/InvenTree/stock/views.py
@@ -5,7 +5,7 @@ from .models import StockLocation, StockItem
 from .serializers import StockItemSerializer, LocationDetailSerializer
 
 
-class PartStockDetail(generics.ListAPIView):
+class PartStockDetail(generics.ListCreateAPIView):
     """ Return a list of all stockitems for a given part
     """
 
diff --git a/requirements/base.txt b/requirements/base.txt
index 1a4283d80d..0c17b62bfe 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,2 +1,3 @@
 Django==1.11
 djangorestframework==3.6.2
+django_filter==1.0.2