diff --git a/eos/config.py b/eos/config.py
index 75f797d9c..ec64e2bd3 100644
--- a/eos/config.py
+++ b/eos/config.py
@@ -23,7 +23,8 @@ else:
 pyfalog.debug("Saveddata connection string: {0}", saveddata_connectionstring)
 
 settings = {
-    "useStaticAdaptiveArmorHardener": False
+    "useStaticAdaptiveArmorHardener": False,
+    "strictSkillLevels": True,
 }
 
 # Autodetect path, only change if the autodetection bugs out.
diff --git a/eos/db/gamedata/queries.py b/eos/db/gamedata/queries.py
index 30f51fe6b..db333fdbd 100644
--- a/eos/db/gamedata/queries.py
+++ b/eos/db/gamedata/queries.py
@@ -17,7 +17,7 @@
 # along with eos.  If not, see <http://www.gnu.org/licenses/>.
 # ===============================================================================
 
-from sqlalchemy.orm import join, exc
+from sqlalchemy.orm import join, exc, aliased
 from sqlalchemy.sql import and_, or_, select
 
 import eos.config
@@ -315,3 +315,24 @@ def directAttributeRequest(itemIDs, attrIDs):
 
     result = gamedata_session.execute(q).fetchall()
     return result
+
+def getRequiredFor(itemID, attrMapping):
+    Attribute1 = aliased(Attribute)
+    Attribute2 = aliased(Attribute)
+
+    skillToLevelClauses = []
+
+    for attrSkill, attrLevel in attrMapping.iteritems():
+        skillToLevelClauses.append(and_(Attribute1.attributeID == attrSkill, Attribute2.attributeID == attrLevel))
+
+    queryOr = or_(*skillToLevelClauses)
+
+    q = select((Attribute2.typeID, Attribute2.value),
+               and_(Attribute1.value == itemID, queryOr),
+               from_obj=[
+                   join(Attribute1, Attribute2, Attribute1.typeID == Attribute2.typeID)
+               ])
+
+    result = gamedata_session.execute(q).fetchall()
+
+    return result
diff --git a/eos/gamedata.py b/eos/gamedata.py
index 701c4131c..70a051c8f 100644
--- a/eos/gamedata.py
+++ b/eos/gamedata.py
@@ -238,6 +238,7 @@ class Item(EqBase):
     def init(self):
         self.__race = None
         self.__requiredSkills = None
+        self.__requiredFor = None
         self.__moved = False
         self.__offensive = None
         self.__assistive = None
@@ -290,6 +291,8 @@ class Item(EqBase):
         eos.db.saveddata_session.delete(override)
         eos.db.commit()
 
+    srqIDMap = {182: 277, 183: 278, 184: 279, 1285: 1286, 1289: 1287, 1290: 1288}
+
     @property
     def requiredSkills(self):
         if self.__requiredSkills is None:
@@ -297,8 +300,7 @@ class Item(EqBase):
             self.__requiredSkills = requiredSkills
             # Map containing attribute IDs we may need for required skills
             # { requiredSkillX : requiredSkillXLevel }
-            srqIDMap = {182: 277, 183: 278, 184: 279, 1285: 1286, 1289: 1287, 1290: 1288}
-            combinedAttrIDs = set(srqIDMap.iterkeys()).union(set(srqIDMap.itervalues()))
+            combinedAttrIDs = set(self.srqIDMap.iterkeys()).union(set(self.srqIDMap.itervalues()))
             # Map containing result of the request
             # { attributeID : attributeValue }
             skillAttrs = {}
@@ -308,7 +310,7 @@ class Item(EqBase):
                 attrVal = attrInfo[2]
                 skillAttrs[attrID] = attrVal
             # Go through all attributeID pairs
-            for srqIDAtrr, srqLvlAttr in srqIDMap.iteritems():
+            for srqIDAtrr, srqLvlAttr in self.srqIDMap.iteritems():
                 # Check if we have both in returned result
                 if srqIDAtrr in skillAttrs and srqLvlAttr in skillAttrs:
                     skillID = int(skillAttrs[srqIDAtrr])
@@ -318,6 +320,23 @@ class Item(EqBase):
                     requiredSkills[item] = skillLvl
         return self.__requiredSkills
 
+    @property
+    def requiredFor(self):
+        if self.__requiredFor is None:
+            self.__requiredFor = dict()
+
+            # Map containing attribute IDs we may need for required skills
+
+            # Get relevant attribute values from db (required skill IDs and levels) for our item
+            q = eos.db.getRequiredFor(self.ID, self.srqIDMap)
+
+            for itemID, lvl in q:
+                # Fetch item from database and fill map
+                item = eos.db.getItem(itemID)
+                self.__requiredFor[item] = lvl
+
+        return self.__requiredFor
+
     factionMap = {
         500001: "caldari",
         500002: "minmatar",
diff --git a/eos/saveddata/character.py b/eos/saveddata/character.py
index bb316e01d..7febd82c2 100644
--- a/eos/saveddata/character.py
+++ b/eos/saveddata/character.py
@@ -17,6 +17,7 @@
 # along with eos.  If not, see <http://www.gnu.org/licenses/>.
 # ===============================================================================
 
+import time
 
 from logbook import Logger
 from itertools import chain
@@ -25,6 +26,7 @@ from sqlalchemy.orm import validates, reconstructor
 
 import eos
 import eos.db
+import eos.config
 from eos.effectHandlerHelpers import HandledItem, HandledImplantBoosterList
 
 pyfalog = Logger(__name__)
@@ -324,8 +326,8 @@ class Skill(HandledItem):
 
         return self.activeLevel or 0
 
-    @level.setter
-    def level(self, level):
+    def setLevel(self, level, persist=False):
+
         if (level < 0 or level > 5) and level is not None:
             raise ValueError(str(level) + " is not a valid value for level")
 
@@ -333,10 +335,24 @@ class Skill(HandledItem):
             raise ReadOnlyException()
 
         self.activeLevel = level
-        self.character.dirtySkills.add(self)
 
-        if self.activeLevel == self.__level and self in self.character.dirtySkills:
-            self.character.dirtySkills.remove(self)
+        if eos.config.settings['strictSkillLevels']:
+            start = time.time()
+            for item, rlevel in self.item.requiredFor.iteritems():
+                if item.group.category.ID == 16:  # Skill category
+                    if level < rlevel:
+                        skill = self.character.getSkill(item.ID)
+                        #print "Removing skill: {}, Dependant level: {}, Required level: {}".format(skill, level, rlevel)
+                        skill.setLevel(None, persist)
+            pyfalog.debug("Strict Skill levels enabled, time to process {}: {}".format(self.item.ID, time.time() - start))
+
+        if persist:
+            self.saveLevel()
+        else:
+            self.character.dirtySkills.add(self)
+
+            if self.activeLevel == self.__level and self in self.character.dirtySkills:
+                self.character.dirtySkills.remove(self)
 
     @property
     def item(self):
diff --git a/gui/builtinPreferenceViews/pyfaEnginePreferences.py b/gui/builtinPreferenceViews/pyfaEnginePreferences.py
index 4a0f421bc..f9fba7612 100644
--- a/gui/builtinPreferenceViews/pyfaEnginePreferences.py
+++ b/gui/builtinPreferenceViews/pyfaEnginePreferences.py
@@ -24,6 +24,8 @@ class PFFittingEnginePref(PreferenceView):
 
         mainSizer = wx.BoxSizer(wx.VERTICAL)
 
+        helpCursor = wx.StockCursor(wx.CURSOR_QUESTION_ARROW)
+
         self.engine_settings = EOSSettings.getInstance()
 
         self.stTitle = wx.StaticText(panel, wx.ID_ANY, self.title, wx.DefaultPosition, wx.DefaultSize, 0)
@@ -36,8 +38,20 @@ class PFFittingEnginePref(PreferenceView):
 
         self.cbGlobalForceReload = wx.CheckBox(panel, wx.ID_ANY, u"Factor in reload time when calculating capacitor usage, damage, and tank.",
                                                wx.DefaultPosition, wx.DefaultSize, 0)
+
         mainSizer.Add(self.cbGlobalForceReload, 0, wx.ALL | wx.EXPAND, 5)
 
+        self.cbStrictSkillLevels = wx.CheckBox(panel, wx.ID_ANY,
+                                               u"Enforce strict skill level requirements",
+                                               wx.DefaultPosition, wx.DefaultSize, 0)
+        self.cbStrictSkillLevels.SetCursor(helpCursor)
+        self.cbStrictSkillLevels.SetToolTip(wx.ToolTip(
+            u'When enabled, skills will check their dependencies\' requirements when their levels change and reset ' +
+            u'skills that no longer meet the requirement.\neg: Setting Drones from level V to IV will reset the Heavy ' +
+            u'Drone Operation skill, as that requires Drones V'))
+
+        mainSizer.Add(self.cbStrictSkillLevels, 0, wx.ALL | wx.EXPAND, 5)
+
         self.cbUniversalAdaptiveArmorHardener = wx.CheckBox(panel, wx.ID_ANY,
                                                             u"When damage profile is Uniform, set Reactive Armor " +
                                                             u"Hardener to match (old behavior).",
@@ -73,6 +87,9 @@ class PFFittingEnginePref(PreferenceView):
         self.cbGlobalForceReload.SetValue(self.sFit.serviceFittingOptions["useGlobalForceReload"])
         self.cbGlobalForceReload.Bind(wx.EVT_CHECKBOX, self.OnCBGlobalForceReloadStateChange)
 
+        self.cbStrictSkillLevels.SetValue(self.engine_settings.get("strictSkillLevels"))
+        self.cbStrictSkillLevels.Bind(wx.EVT_CHECKBOX, self.OnCBStrictSkillLevelsChange)
+
         self.cbUniversalAdaptiveArmorHardener.SetValue(self.engine_settings.get("useStaticAdaptiveArmorHardener"))
         self.cbUniversalAdaptiveArmorHardener.Bind(wx.EVT_CHECKBOX, self.OnCBUniversalAdaptiveArmorHardenerChange)
 
@@ -82,6 +99,9 @@ class PFFittingEnginePref(PreferenceView):
     def OnCBGlobalForceReloadStateChange(self, event):
         self.sFit.serviceFittingOptions["useGlobalForceReload"] = self.cbGlobalForceReload.GetValue()
 
+    def OnCBStrictSkillLevelsChange(self, event):
+        self.engine_settings.set("strictSkillLevels", self.cbStrictSkillLevels.GetValue())
+
     def OnCBUniversalAdaptiveArmorHardenerChange(self, event):
         self.engine_settings.set("useStaticAdaptiveArmorHardener", self.cbUniversalAdaptiveArmorHardener.GetValue())
 
diff --git a/gui/builtinPreferenceViews/pyfaGeneralPreferences.py b/gui/builtinPreferenceViews/pyfaGeneralPreferences.py
index e75ef55ce..acdfb398b 100644
--- a/gui/builtinPreferenceViews/pyfaGeneralPreferences.py
+++ b/gui/builtinPreferenceViews/pyfaGeneralPreferences.py
@@ -21,6 +21,8 @@ class PFGeneralPref(PreferenceView):
         self.openFitsSettings = SettingsProvider.getInstance().getSettings("pyfaPrevOpenFits",
                                                                            {"enabled": False, "pyfaOpenFits": []})
 
+        helpCursor = wx.StockCursor(wx.CURSOR_QUESTION_ARROW)
+
         mainSizer = wx.BoxSizer(wx.VERTICAL)
 
         self.stTitle = wx.StaticText(panel, wx.ID_ANY, self.title, wx.DefaultPosition, wx.DefaultSize, 0)
@@ -97,6 +99,7 @@ class PFGeneralPref(PreferenceView):
 
         self.stMarketDelay = wx.StaticText(panel, wx.ID_ANY, u"Market Search Delay (ms):", wx.DefaultPosition, wx.DefaultSize, 0)
         self.stMarketDelay.Wrap(-1)
+        self.stMarketDelay.SetCursor(helpCursor)
         self.stMarketDelay.SetToolTip(
             wx.ToolTip('The delay between a keystroke and the market search. Can help reduce lag when typing fast in the market search box.'))
 
diff --git a/gui/characterEditor.py b/gui/characterEditor.py
index a96868e0b..ab9874fe7 100644
--- a/gui/characterEditor.py
+++ b/gui/characterEditor.py
@@ -435,14 +435,28 @@ class SkillTreeView(wx.Panel):
         skillID = self.skillTreeListCtrl.GetPyData(selection)
 
         if level is not None:
-            self.skillTreeListCtrl.SetItemText(selection, "Level %d" % level if isinstance(level, int) else level, 1)
             sChar.changeLevel(char.ID, skillID, level, persist=True)
         elif event.Id == self.revertID:
             sChar.revertLevel(char.ID, skillID)
         elif event.Id == self.saveID:
             sChar.saveSkill(char.ID, skillID)
 
-        self.skillTreeListCtrl.SetItemTextColour(selection, None)
+        # After saving the skill, we need to update not just the selected skill, but all open skills due to strict skill
+        # level setting. We don't want to refresh tree, as that will lose all expanded categories and users location
+        # within the tree. Thus, we loop through the tree and refresh the info.
+        child, cookie = self.skillTreeListCtrl.GetFirstChild(self.root)
+        while child.IsOk():
+            # child = Skill category
+            grand, cookie2 = self.skillTreeListCtrl.GetFirstChild(child)
+            while grand.IsOk():
+                # grand = Skill (or "dummy" if not expanded)
+                if self.skillTreeListCtrl.GetItemText(grand) != "dummy":
+                    lvl, dirty = sChar.getSkillLevel(char.ID, self.skillTreeListCtrl.GetPyData(grand))
+                    self.skillTreeListCtrl.SetItemText(grand, "Level {}".format(lvl) if not isinstance(lvl, basestring) else lvl, 1)
+                    if not dirty:
+                        self.skillTreeListCtrl.SetItemTextColour(grand, None)
+                grand, cookie2 = self.skillTreeListCtrl.GetNextChild(child, cookie2)
+            child, cookie = self.skillTreeListCtrl.GetNextChild(self.root, cookie)
 
         dirtySkills = sChar.getDirtySkills(char.ID)
         dirtyGroups = set([skill.item.group.ID for skill in dirtySkills])
diff --git a/gui/itemStats.py b/gui/itemStats.py
index 0a49b3846..2596413d9 100644
--- a/gui/itemStats.py
+++ b/gui/itemStats.py
@@ -191,6 +191,10 @@ class ItemStatsContainer(wx.Panel):
         self.reqs = ItemRequirements(self.nbContainer, stuff, item)
         self.nbContainer.AddPage(self.reqs, "Requirements")
 
+        if context == "Skill":
+            self.dependants = ItemDependants(self.nbContainer, stuff, item)
+            self.nbContainer.AddPage(self.dependants, "Dependants")
+
         self.effects = ItemEffects(self.nbContainer, stuff, item)
         self.nbContainer.AddPage(self.effects, "Effects")
 
@@ -762,6 +766,55 @@ class ItemRequirements(wx.Panel):
                 self.skillIdHistory.append(skill.ID)
 
 
+class ItemDependants(wx.Panel):
+    def __init__(self, parent, stuff, item):
+        wx.Panel.__init__(self, parent, style=wx.TAB_TRAVERSAL)
+
+        # itemId is set by the parent.
+        self.romanNb = ["0", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX", "X"]
+        self.skillIdHistory = []
+        mainSizer = wx.BoxSizer(wx.VERTICAL)
+
+        self.reqTree = wx.TreeCtrl(self, style=wx.TR_DEFAULT_STYLE | wx.TR_HIDE_ROOT | wx.NO_BORDER)
+
+        mainSizer.Add(self.reqTree, 1, wx.ALL | wx.EXPAND, 0)
+
+        self.SetSizer(mainSizer)
+        self.root = self.reqTree.AddRoot("WINRARZOR")
+        self.reqTree.SetPyData(self.root, None)
+
+        self.imageList = wx.ImageList(16, 16)
+        self.reqTree.SetImageList(self.imageList)
+        skillBookId = self.imageList.Add(BitmapLoader.getBitmap("skill_small", "gui"))
+
+        self.getFullSkillTree(item, self.root, skillBookId)
+
+        self.Layout()
+
+    def getFullSkillTree(self, parentSkill, parent, sbIconId):
+        levelToItems = {}
+
+        for item, level in parentSkill.requiredFor.iteritems():
+            if level not in levelToItems:
+                levelToItems[level] = []
+            levelToItems[level].append(item)
+
+        for x in sorted(levelToItems.keys()):
+            items = levelToItems[x]
+            items.sort(key=lambda x: x.name)
+
+            child = self.reqTree.AppendItem(parent, "Level {}".format(self.romanNb[int(x)]), sbIconId)
+            for item in items:
+
+                if item.icon:
+                    bitmap = BitmapLoader.getBitmap(item.icon.iconFile, "icons")
+                    itemIcon = self.imageList.Add(bitmap) if bitmap else -1
+                else:
+                    itemIcon = -1
+
+                grand = self.reqTree.AppendItem(child, "{}".format(item.name), itemIcon)
+
+
 class ItemEffects(wx.Panel):
     def __init__(self, parent, stuff, item):
         wx.Panel.__init__(self, parent)
diff --git a/service/character.py b/service/character.py
index daac57b1b..f1bdfb8d3 100644
--- a/service/character.py
+++ b/service/character.py
@@ -383,12 +383,9 @@ class Character(object):
             return
 
         if isinstance(level, basestring) or level > 5 or level < 0:
-            skill.level = None
+            skill.setLevel(None, persist)
         else:
-            skill.level = level
-
-        if persist:
-            skill.saveLevel()
+            skill.setLevel(level, persist)
 
         eos.db.commit()