diff --git a/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/UseCases/ModifyPsychomatrixUseCase.kt b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/UseCases/ModifyPsychomatrixUseCase.kt
new file mode 100644
index 0000000..89e70f2
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/UseCases/ModifyPsychomatrixUseCase.kt
@@ -0,0 +1,31 @@
+package com.github.insanusmokrassar.PsychomatrixBase.domain.UseCases
+
+import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.Psychomatrix
+import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.operations.Operation
+import kotlinx.coroutines.experimental.Deferred
+import kotlinx.coroutines.experimental.async
+import kotlinx.coroutines.experimental.channels.ReceiveChannel
+
+typealias PsychomatrixOperationIsConvert = Pair<Psychomatrix, Pair<Operation, Boolean>>
+
+interface ModifyPsychomatrixUseCase {
+
+    fun openPsychomatrixChangedSubscription(): ReceiveChannel<PsychomatrixOperationIsConvert>
+
+    suspend fun makeConvert(psychomatrix: Psychomatrix, operation: Operation): Deferred<Boolean>
+    suspend fun makeInvert(psychomatrix: Psychomatrix, operation: Operation): Deferred<Boolean>
+
+    suspend fun getConverts(psychomatrix: Psychomatrix): Deferred<List<Operation>>
+    suspend fun getInverts(psychomatrix: Psychomatrix): Deferred<List<Operation>>
+
+    suspend fun getOperations(psychomatrix: Psychomatrix): Deferred<List<Operation>> = async {
+        listOf(
+            getConverts(psychomatrix),
+            getInverts(psychomatrix)
+        ).flatMap {
+            it.await()
+        }
+    }
+
+    suspend fun getPsychomatrixHistory(psychomatrix: Psychomatrix): Deferred<List<Operation>>
+}
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diff --git a/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/interactors/ModifyPsychomatrixUseCaseInteractor.kt b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/interactors/ModifyPsychomatrixUseCaseInteractor.kt
new file mode 100644
index 0000000..05487d8
--- /dev/null
+++ b/src/main/kotlin/com/github/insanusmokrassar/PsychomatrixBase/domain/interactors/ModifyPsychomatrixUseCaseInteractor.kt
@@ -0,0 +1,54 @@
+package com.github.insanusmokrassar.PsychomatrixBase.domain.interactors
+
+import com.github.insanusmokrassar.PsychomatrixBase.domain.UseCases.ModifyPsychomatrixUseCase
+import com.github.insanusmokrassar.PsychomatrixBase.domain.UseCases.PsychomatrixOperationIsConvert
+import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.MutablePsychomatrix
+import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.Psychomatrix
+import com.github.insanusmokrassar.PsychomatrixBase.domain.entities.operations.Operation
+import com.github.insanusmokrassar.PsychomatrixBase.utils.extensions.SUBSCRIPTIONS_MEDIUM
+import kotlinx.coroutines.experimental.Deferred
+import kotlinx.coroutines.experimental.async
+import kotlinx.coroutines.experimental.channels.BroadcastChannel
+import kotlinx.coroutines.experimental.channels.ReceiveChannel
+
+class ModifyPsychomatrixUseCaseInteractor : ModifyPsychomatrixUseCase {
+    private val currentPsychomatrixes: MutableList<MutablePsychomatrix> = ArrayList()
+
+    private val psychomatrixChangedBroadcastChannel = BroadcastChannel<PsychomatrixOperationIsConvert>(SUBSCRIPTIONS_MEDIUM)
+
+    override fun openPsychomatrixChangedSubscription(): ReceiveChannel<PsychomatrixOperationIsConvert> {
+        return psychomatrixChangedBroadcastChannel.openSubscription()
+    }
+
+    override suspend fun makeConvert(psychomatrix: Psychomatrix, operation: Operation): Deferred<Boolean> {
+        return async {
+            asMutablePsychomatrix(psychomatrix).applyConvert(operation)
+        }
+    }
+
+    override suspend fun makeInvert(psychomatrix: Psychomatrix, operation: Operation): Deferred<Boolean> {
+        return async {
+            asMutablePsychomatrix(psychomatrix).applyInvert(operation)
+        }
+    }
+
+    override suspend fun getConverts(psychomatrix: Psychomatrix): Deferred<List<Operation>> {
+        return asMutablePsychomatrix(psychomatrix).availableConverts
+    }
+
+    override suspend fun getInverts(psychomatrix: Psychomatrix): Deferred<List<Operation>> {
+        return asMutablePsychomatrix(psychomatrix).availableInverts
+    }
+
+    override suspend fun getPsychomatrixHistory(psychomatrix: Psychomatrix): Deferred<List<Operation>> {
+        return asMutablePsychomatrix(psychomatrix).operationsHistory
+    }
+
+    private fun asMutablePsychomatrix(psychomatrix: Psychomatrix): MutablePsychomatrix {
+        return currentPsychomatrixes.firstOrNull {
+            it == psychomatrix
+        } ?: MutablePsychomatrix(psychomatrix).also {
+            currentPsychomatrixes.add(it)
+        }
+    }
+}
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