diff --git a/app/Main.hs b/app/Main.hs
index 3813079a9..cea221ff9 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -320,7 +320,7 @@ microarchWithProtos ioSync = defineNetwork "net1" ioSync $ do
     addPrototype "mul{x}" MultiplierIO
     addPrototype "accum{x}" AccumIO
     addPrototype "div{x}" DividerIO
-    add "spi" $ -- use addPrototype when https://github.com/ryukzak/nitta/issues/194 will be fixed
+    add "spi" $ -- FIXME: use addPrototype when https://github.com/ryukzak/nitta/issues/194 will be fixed
         SPISlave
             { slave_mosi = InputPortTag "mosi"
             , slave_miso = OutputPortTag "miso"
diff --git a/examples/microarch.toml b/examples/microarch.toml
index 2e19d8746..8ed5cfcf5 100644
--- a/examples/microarch.toml
+++ b/examples/microarch.toml
@@ -43,4 +43,4 @@ isInt = true
 type = "Divider"
 name = "div{x}"
 mock = true
-pipeline = 4
\ No newline at end of file
+pipeline = 4
diff --git a/src/NITTA/Model/Microarchitecture/Config.hs b/src/NITTA/Model/Microarchitecture/Config.hs
index bdc2b6f27..60f32e85b 100644
--- a/src/NITTA/Model/Microarchitecture/Config.hs
+++ b/src/NITTA/Model/Microarchitecture/Config.hs
@@ -1,15 +1,11 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PartialTypeSignatures #-}
-{-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
-
-{-# HLINT ignore "Use forM_" #-}
 
 module NITTA.Model.Microarchitecture.Config (
     mkMicroarchitecture,
 ) where
 
-import Control.Monad.State (when)
 import Data.Aeson (
     FromJSON (parseJSON),
     Options (sumEncoding),
@@ -21,7 +17,6 @@ import Data.Aeson (
  )
 import Data.Default (Default (def))
 import Data.HashMap.Internal.Strict (HashMap)
-import Data.Maybe (fromJust, isJust)
 import Data.Text qualified as T
 import GHC.Generics (Generic)
 import NITTA.Intermediate.Value (Val)
@@ -83,8 +78,8 @@ instance FromJSON PUConf where
 
 data NetworkConf = NetworkConf
     { name :: T.Text
-    , pus :: Maybe [PUConf]
-    , protos :: Maybe [PUConf]
+    , pus :: [PUConf]
+    , protos :: [PUConf]
     }
     deriving (Generic, Show)
 
@@ -105,8 +100,8 @@ mkMicroarchitecture ioSync toml =
             | proto = addCustomPrototype
             | otherwise = addCustom
         build NetworkConf{pus, protos} = do
-            when (isJust pus) $ mapM_ (configure False) $ fromJust pus
-            when (isJust protos) $ mapM_ (configure True) $ fromJust protos
+            mapM_ (configure False) pus
+            mapM_ (configure True) protos
             where
                 configure proto Accum{name} = addPU proto name def PU.AccumIO
                 configure proto Divider{name, pipeline, mock} = addPU proto name (PU.divider pipeline mock) PU.DividerIO
@@ -132,6 +127,6 @@ mkMicroarchitecture ioSync toml =
                                     }
         nets = networks (getFromToml toml :: MicroarchitectureConf)
         mkNetwork net@NetworkConf{name} = modifyNetwork (busNetwork name ioSync) (build net)
-     in if length nets > 1
-            then error "multi-networks are not currently supported"
-            else mkNetwork (head nets)
+     in case nets of
+            [n] -> mkNetwork n
+            _ -> error "multi-networks are not currently supported"
diff --git a/src/NITTA/Model/Networks/Bus.hs b/src/NITTA/Model/Networks/Bus.hs
index f594ecafd..7bdb1fc95 100644
--- a/src/NITTA/Model/Networks/Bus.hs
+++ b/src/NITTA/Model/Networks/Bus.hs
@@ -187,7 +187,7 @@ instance (UnitTag tag, VarValTime v x t) => DataflowProblem (BusNetwork tag v x
 instance (UnitTag tag, VarValTime v x t) => ProcessorUnit (BusNetwork tag v x t) v x t where
     tryBind f net@BusNetwork{bnRemains, bnPus, bnPUPrototypes}
         | any (allowToProcess f) (M.elems bnPus) = Right net{bnRemains = f : bnRemains}
-        -- TODO
+        -- TODO:
         -- There are several issues that need to be addressed: see https://github.com/ryukzak/nitta/pull/195#discussion_r853486450
         -- 1) Now the binding of functions to the network is hardcoded, that prevents use of an empty uarch at the start
         -- 2) If Allocation options are independent of the bnRemains, then they are present in all synthesis states, which means no leaves in the synthesis tree
@@ -423,26 +423,26 @@ instance (UnitTag tag) => AllocationProblem (BusNetwork tag v x t) tag where
     allocationOptions BusNetwork{bnName, bnRemains, bnPUPrototypes} =
         map toOptions $ M.keys $ M.filter (\PUPrototype{pProto} -> any (`allowToProcess` pProto) bnRemains) bnPUPrototypes
         where
-            toOptions puTag =
+            toOptions processUnitTag =
                 Allocation
-                    { bnTag = bnName
-                    , puTag
+                    { networkTag = bnName
+                    , processUnitTag
                     }
 
-    allocationDecision bn@BusNetwork{bnPUPrototypes, bnPus, bnProcess} alloc@Allocation{bnTag, puTag} =
-        let tag = bnTag <> "_" <> fromTemplate puTag (show (length bnPus))
+    allocationDecision bn@BusNetwork{bnPUPrototypes, bnPus, bnProcess} alloc@Allocation{networkTag, processUnitTag} =
+        let tag = networkTag <> "_" <> fromTemplate processUnitTag (show (length bnPus))
             prototype =
-                if M.member puTag bnPUPrototypes
-                    then bnPUPrototypes M.! puTag
-                    else error $ "No suitable prototype for the tag (" <> toString puTag <> ")"
+                if M.member processUnitTag bnPUPrototypes
+                    then bnPUPrototypes M.! processUnitTag
+                    else error $ "No suitable prototype for the tag (" <> toString processUnitTag <> ")"
             addPU t PUPrototype{pProto, pIOPorts} = modifyNetwork bn $ do addCustom t pProto pIOPorts
             nBn = addPU tag prototype
          in nBn
                 { bnProcess = execScheduleWithProcess bn bnProcess $ scheduleAllocation alloc
                 , bnPUPrototypes =
-                    if isTemplate puTag
+                    if isTemplate processUnitTag
                         then bnPUPrototypes
-                        else M.delete puTag bnPUPrototypes
+                        else M.delete processUnitTag bnPUPrototypes
                 }
 
 --------------------------------------------------------------------------
diff --git a/src/NITTA/Model/Networks/Types.hs b/src/NITTA/Model/Networks/Types.hs
index 0626f16c2..49e70cb82 100644
--- a/src/NITTA/Model/Networks/Types.hs
+++ b/src/NITTA/Model/Networks/Types.hs
@@ -178,7 +178,7 @@ data PUPrototype tag v x t where
         { pTag :: tag
         -- ^Prototype tag. You can specify tag as a template by adding {x}.
         -- This will allow to allocate PU more than once by replacing {x} with index.
-        -- When PU is allocated puTag will look like bnName_pTag.
+        -- When PU is allocated processUnitTag will look like bnName_pTag.
         , pProto :: pu
         -- ^PU prototype
         , pIOPorts :: IOPorts pu
diff --git a/src/NITTA/Model/Problems/Allocation.hs b/src/NITTA/Model/Problems/Allocation.hs
index 137a843dd..57f2a5704 100644
--- a/src/NITTA/Model/Problems/Allocation.hs
+++ b/src/NITTA/Model/Problems/Allocation.hs
@@ -6,7 +6,7 @@
 {- |
 Module      : NITTA.Model.Problems.Allocation
 Description : PU allocation on the bus network
-Copyright   : (c) Aleksandr Penskoi, 2022
+Copyright   : (c) Aleksandr Penskoi, Vitaliy Zakusilo, 2022
 License     : BSD3
 Maintainer  : aleksandr.penskoi@gmail.com
 Stability   : experimental
@@ -20,15 +20,15 @@ import Data.String.ToString (ToString (..))
 import GHC.Generics (Generic)
 
 data Allocation tag = Allocation
-    { bnTag :: tag
+    { networkTag :: tag
     -- ^Tag of the BusNetwork where PU will be allocated
-    , puTag :: tag
+    , processUnitTag :: tag
     -- ^Tag of the prototype that will be used for allocation
     }
     deriving (Generic, Eq)
 
 instance (ToString tag) => Show (Allocation tag) where
-    show Allocation{bnTag, puTag} = "Allocation of " <> toString puTag <> " on " <> toString bnTag
+    show Allocation{networkTag, processUnitTag} = "Allocation of " <> toString processUnitTag <> " on " <> toString networkTag
 
 class AllocationProblem u tag | u -> tag where
     allocationOptions :: u -> [Allocation tag]
diff --git a/src/NITTA/Model/Problems/ViewHelper.hs b/src/NITTA/Model/Problems/ViewHelper.hs
index 07909bfa7..ec315a4ca 100644
--- a/src/NITTA/Model/Problems/ViewHelper.hs
+++ b/src/NITTA/Model/Problems/ViewHelper.hs
@@ -36,8 +36,8 @@ data DecisionView
         , pu :: T.Text
         }
     | AllocationView
-        { bnTag :: T.Text
-        , puTag :: T.Text
+        { networkTag :: T.Text
+        , processUnitTag :: T.Text
         }
     | DataflowDecisionView
         { source :: (T.Text, EndpointSt T.Text (Interval Int))
@@ -70,10 +70,10 @@ instance (UnitTag tag) => Viewable (Bind tag v x) DecisionView where
             }
 
 instance (UnitTag tag) => Viewable (Allocation tag) DecisionView where
-    view Allocation{bnTag, puTag} =
+    view Allocation{networkTag, processUnitTag} =
         AllocationView
-            { bnTag = toText bnTag
-            , puTag = toText puTag
+            { networkTag = toText networkTag
+            , processUnitTag = toText processUnitTag
             }
 
 instance (UnitTag tag, Var v, Time t) => Viewable (DataflowSt tag v (Interval t)) DecisionView where
diff --git a/src/NITTA/Model/TargetSystem.hs b/src/NITTA/Model/TargetSystem.hs
index bcccda532..116142b8e 100644
--- a/src/NITTA/Model/TargetSystem.hs
+++ b/src/NITTA/Model/TargetSystem.hs
@@ -63,7 +63,7 @@ instance
 instance (BindProblem u tag v x) => BindProblem (TargetSystem u tag v x t) tag v x where
     bindOptions TargetSystem{mUnit} = bindOptions mUnit
 
-    bindDecision f@TargetSystem{mUnit} d = f{mUnit = bindDecision mUnit d}
+    bindDecision ts@TargetSystem{mUnit} d = ts{mUnit = bindDecision mUnit d}
 
 instance (DataflowProblem u tag v t) => DataflowProblem (TargetSystem u tag v x t) tag v t where
     dataflowOptions TargetSystem{mUnit} = dataflowOptions mUnit
diff --git a/src/NITTA/Synthesis/Method.hs b/src/NITTA/Synthesis/Method.hs
index 72ee8e71a..cf1f298f1 100644
--- a/src/NITTA/Synthesis/Method.hs
+++ b/src/NITTA/Synthesis/Method.hs
@@ -125,7 +125,9 @@ allBestThreadIO n tree = do
 bestLeaf :: (VarValTime v x t, UnitTag tag) => DefTree tag v x t -> [DefTree tag v x t] -> DefTree tag v x t
 bestLeaf tree leafs =
     let successLeafs = filter (\node -> isComplete node && isLeaf node) leafs
-        target = sTarget . sState
      in case successLeafs of
-            _ : _ -> minimumOn (\l -> (processDuration $ target l, puSize $ target l)) successLeafs
+            _ : _ ->
+                minimumOn
+                    (\Tree{sState = SynthesisState{sTarget}} -> (processDuration sTarget, puSize sTarget))
+                    successLeafs
             [] -> headDef tree leafs
diff --git a/src/NITTA/Synthesis/Steps/Allocation.hs b/src/NITTA/Synthesis/Steps/Allocation.hs
index a29df3155..fa705e189 100644
--- a/src/NITTA/Synthesis/Steps/Allocation.hs
+++ b/src/NITTA/Synthesis/Steps/Allocation.hs
@@ -8,7 +8,7 @@
 {- |
 Module      : NITTA.Synthesis.Steps.Allocation
 Description : Implementation of SynthesisDecisionCls that allows to allocate PUs
-Copyright   : (c) Aleksandr Penskoi, 2022
+Copyright   : (c) Aleksandr Penskoi, Vitaliy Zakusilo, 2022
 License     : BSD3
 Maintainer  : aleksandr.penskoi@gmail.com
 Stability   : experimental
@@ -24,7 +24,7 @@ import NITTA.Intermediate.Analysis (ProcessWave (ProcessWave, pwFs))
 import NITTA.Model.Networks.Bus (BusNetwork (bnPUPrototypes, bnPus, bnRemains))
 import NITTA.Model.Networks.Types (PU (PU, unit), PUPrototype (..))
 import NITTA.Model.Problems.Allocation (
-    Allocation (Allocation, puTag),
+    Allocation (Allocation, processUnitTag),
     AllocationProblem (allocationDecision),
  )
 import NITTA.Model.ProcessorUnits.Types (
@@ -66,9 +66,9 @@ instance
     where
     decisions SynthesisState{sTarget} o = [(o, allocationDecision sTarget o)]
 
-    parameters SynthesisState{sTarget = TargetSystem{mUnit}, processWaves, numberOfProcessWaves} Allocation{puTag} _ =
+    parameters SynthesisState{sTarget = TargetSystem{mUnit}, processWaves, numberOfProcessWaves} Allocation{processUnitTag} _ =
         let pus = M.elems $ bnPus mUnit
-            tmp = bnPUPrototypes mUnit M.! puTag
+            tmp = bnPUPrototypes mUnit M.! processUnitTag
             mParallelism PUPrototype{pProto} = parallelismType pProto
             canProcessTmp PUPrototype{pProto} f = allowToProcess f pProto
             canProcessPU PU{unit} f = allowToProcess f unit
diff --git a/src/NITTA/Synthesis/Steps/Dataflow.hs b/src/NITTA/Synthesis/Steps/Dataflow.hs
index 2f7941676..497d2d971 100644
--- a/src/NITTA/Synthesis/Steps/Dataflow.hs
+++ b/src/NITTA/Synthesis/Steps/Dataflow.hs
@@ -54,7 +54,7 @@ data DataflowMetrics = DataflowMetrics
     , pNotTransferableInputs :: [Float]
     -- ^number of variables, which is not transferable for affected
     -- functions.
-    , pWaveOfUse :: Float
+    , pFirstWaveOfTargetUse :: Float
     -- ^number of the first wave in which one of the target variables is used
     }
     deriving (Generic)
@@ -76,7 +76,10 @@ instance
         let TimeConstraint{tcAvailable, tcDuration} = epAt $ snd dfSource
             vs = unionsMap (variables . snd) dfTargets
             lvs = length vs
-            waveNum = length . takeWhile (\ProcessWave{pwFs} -> lvs == length (vs `S.difference` unionsMap inputs pwFs)) $ processWaves
+            waveNum =
+                length
+                    . takeWhile (\ProcessWave{pwFs} -> lvs == length (vs `S.difference` unionsMap inputs pwFs))
+                    $ processWaves
          in DataflowMetrics
                 { pWaitTime = fromIntegral (inf tcAvailable)
                 , pRestrictedTime = fromEnum (sup tcDuration) /= maxBound
@@ -85,18 +88,27 @@ instance
                         affectedFunctions = filter (\f -> not $ null (inputs f `S.intersection` vs)) fs
                         notTransferableVars = map (\f -> inputs f S.\\ transferableVars) affectedFunctions
                      in map (fromIntegral . length) notTransferableVars
-                , pWaveOfUse = fromIntegral waveNum :: Float
+                , pFirstWaveOfTargetUse = fromIntegral waveNum :: Float
                 }
 
-    estimate SynthesisState{numberOfDataflowOptions} _o _d DataflowMetrics{pWaitTime, pNotTransferableInputs, pRestrictedTime, pWaveOfUse} =
-        2000
-            + (numberOfDataflowOptions >= threshold)
-            <?> 1000
-            + pRestrictedTime
-            <?> 200
-            - sum pNotTransferableInputs
-            * 5
-            - pWaitTime
-            - pWaveOfUse
+    estimate
+        SynthesisState{numberOfDataflowOptions}
+        _o
+        _d
+        DataflowMetrics
+            { pWaitTime
+            , pNotTransferableInputs
+            , pRestrictedTime
+            , pFirstWaveOfTargetUse
+            } =
+            2000
+                + (numberOfDataflowOptions >= threshold)
+                <?> 1000
+                + pRestrictedTime
+                <?> 200
+                - sum pNotTransferableInputs
+                * 5
+                - pWaitTime
+                - pFirstWaveOfTargetUse
 
 threshold = 20
diff --git a/src/NITTA/UIBackend/ViewHelper.hs b/src/NITTA/UIBackend/ViewHelper.hs
index dc3390d36..6146a7ce7 100644
--- a/src/NITTA/UIBackend/ViewHelper.hs
+++ b/src/NITTA/UIBackend/ViewHelper.hs
@@ -243,7 +243,7 @@ instance ToSample (NodeView tag v x t) where
                             { pWaitTime = 1
                             , pRestrictedTime = False
                             , pNotTransferableInputs = [0, 0]
-                            , pWaveOfUse = 0
+                            , pFirstWaveOfTargetUse = 0
                             }
                 , decision =
                     DataflowDecisionView
diff --git a/test/NITTA/Model/ProcessorUnits/Tests/DSL.hs b/test/NITTA/Model/ProcessorUnits/Tests/DSL.hs
index 747f72333..68174a526 100644
--- a/test/NITTA/Model/ProcessorUnits/Tests/DSL.hs
+++ b/test/NITTA/Model/ProcessorUnits/Tests/DSL.hs
@@ -456,9 +456,9 @@ doTransfer vs = do
         Nothing -> lift $ assertFailure $ "can't find transfer for: " <> show vs <> " in: " <> show opts
 
 doAllocation :: T.Text -> T.Text -> TSStatement x ()
-doAllocation bnTag puTag = do
+doAllocation networkTag processUnitTag = do
     st@UnitTestState{unit = ts} <- get
-    let d = Allocation{bnTag = bnTag, puTag = puTag}
+    let d = Allocation{networkTag = networkTag, processUnitTag = processUnitTag}
         opts = allocationOptions ts
     unless (d `L.elem` opts) $
         lift $
@@ -526,10 +526,11 @@ assertEmptyDataFlow = do
         error "assertEmptyDataFlow: dataflow should be empty"
 
 mkAllocation :: T.Text -> T.Text -> Statement u v x (Allocation T.Text)
-mkAllocation bnTag puTag = return Allocation{bnTag, puTag}
+mkAllocation networkTag processUnitTag = return Allocation{networkTag, processUnitTag}
 
 mkAllocationOptions :: (Typeable tag, UnitTag tag) => tag -> [tag] -> Statement u v x [Allocation tag]
-mkAllocationOptions bnTag puTags = return $ map (\puTag -> Allocation{bnTag, puTag}) puTags
+mkAllocationOptions networkTag puTags =
+    return $ map (\processUnitTag -> Allocation{networkTag, processUnitTag}) puTags
 
 assertAllocation :: (Typeable a, Eq a, Show a) => Int -> a -> TSStatement x ()
 assertAllocation number alloc = do
diff --git a/test/NITTA/Model/ProcessorUnits/Tests/DSL/Tests.hs b/test/NITTA/Model/ProcessorUnits/Tests/DSL/Tests.hs
index 3c659d5da..05a28f8a5 100644
--- a/test/NITTA/Model/ProcessorUnits/Tests/DSL/Tests.hs
+++ b/test/NITTA/Model/ProcessorUnits/Tests/DSL/Tests.hs
@@ -324,7 +324,7 @@ tests =
                             Bus.addCustomPrototype "fram{x}" (framWithSize 32) FramIO
                             Bus.addPrototype "accum{x}" AccumIO
                             Bus.addPrototype "mul{x}" MultiplierIO
-                            Bus.add "spi" $ -- use addPrototype when https://github.com/ryukzak/nitta/issues/194 will be fixed
+                            Bus.add "spi" $ -- FIXME: use addPrototype when https://github.com/ryukzak/nitta/issues/194 will be fixed
                                 SPISlave
                                     { slave_mosi = InputPortTag "mosi"
                                     , slave_miso = OutputPortTag "miso"
diff --git a/web/src/components/SubforestTables.tsx b/web/src/components/SubforestTables.tsx
index a08f44055..2aaa159a6 100644
--- a/web/src/components/SubforestTables.tsx
+++ b/web/src/components/SubforestTables.tsx
@@ -77,10 +77,7 @@ export const SubforestTables: FC<SubforestTablesProps> = ({ nodes }) => {
       <Table
         name="Refactor"
         nodes={nodes.filter(
-          (e) =>
-            e.decision.tag !== "DataflowDecisionView" &&
-            e.decision.tag !== "BindDecisionView" &&
-            e.decision.tag !== "AllocationView"
+          (e) => !["DataflowDecisionView", "BindDecisionView", "AllocationView"].includes(e.decision.tag)
         )}
         columns={[
           sidColumn(appContext.setSID),
@@ -120,7 +117,7 @@ export const SubforestTables: FC<SubforestTablesProps> = ({ nodes }) => {
             60
           ),
           textColumn("restricted", (e: Node) => String((e.parameters as DataflowMetrics).pRestrictedTime), 60),
-          textColumn("wave of use", (e: Node) => String((e.parameters as DataflowMetrics).pWaveOfUse), 60),
+          textColumn("first wave of target use", (e: Node) => String((e.parameters as DataflowMetrics).pFirstWaveOfTargetUse), 60),
           detailColumn(),
         ]}
       />
diff --git a/web/src/components/SubforestTables/Columns.tsx b/web/src/components/SubforestTables/Columns.tsx
index 19224d51d..0003f9d87 100644
--- a/web/src/components/SubforestTables/Columns.tsx
+++ b/web/src/components/SubforestTables/Columns.tsx
@@ -212,7 +212,7 @@ export function showResolveDeadlock(decision: ResolveDeadlock): ReactElement {
 export function showAllocation(decision: Allocation): ReactElement {
   return (
     <div>
-      <strong>{decision.bnTag}</strong> <Icon.ArrowLeft /> {decision.puTag}
+      <strong>{decision.networkTag}</strong> <Icon.ArrowLeft /> {decision.processUnitTag}
     </div>
   );
 }