diff --git a/core/README.md b/core/README.md
index 002d884..95ac13b 100644
--- a/core/README.md
+++ b/core/README.md
@@ -5,4 +5,5 @@
 ## Modules
 
 * [kotlinx-coroutines-core](kotlinx-coroutines-core/README.md) -- core coroutine builders and synchronization primitives. 
+* [kotlinx-coroutines-io](kotlinx-coroutines-io/README.md) -- byte I/O channels (_unstable_, work in progress). 
 
diff --git a/core/kotlinx-coroutines-io/README.md b/core/kotlinx-coroutines-io/README.md
new file mode 100644
index 0000000..03a32b2
--- /dev/null
+++ b/core/kotlinx-coroutines-io/README.md
@@ -0,0 +1,16 @@
+# Module kotlinx-coroutines-io
+
+Byte I/O channels (_unstable_, work in progress).
+
+# Package kotlinx.coroutines.experimental.io
+
+Byte I/O channels (_unstable_, work in progress).
+
+# Package kotlinx.coroutines.experimental.io.packet
+
+Byte I/O packets (_unstable_, work in progress).
+
+<!--- MODULE kotlinx-coroutines-io -->
+<!--- INDEX kotlinx.coroutines.experimental.io -->
+<!--- INDEX kotlinx.coroutines.experimental.io.packet -->
+<!--- END -->
diff --git a/integration/kotlinx-coroutines-io/pom.xml b/core/kotlinx-coroutines-io/pom.xml
similarity index 96%
rename from integration/kotlinx-coroutines-io/pom.xml
rename to core/kotlinx-coroutines-io/pom.xml
index c736bad..9c99841 100644
--- a/integration/kotlinx-coroutines-io/pom.xml
+++ b/core/kotlinx-coroutines-io/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>kotlinx-coroutines</artifactId>
         <groupId>org.jetbrains.kotlinx</groupId>
-        <version>0.17-SNAPSHOT</version>
+        <version>0.18-SNAPSHOT</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBuffer.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBuffer.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBuffer.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBuffer.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannel.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannel.kt
similarity index 98%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannel.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannel.kt
index 1486f22..5ef9366 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannel.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannel.kt
@@ -2,12 +2,14 @@
 
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import kotlinx.coroutines.experimental.channels.*
+import kotlinx.coroutines.experimental.CancellableContinuation
+import kotlinx.coroutines.experimental.channels.ClosedReceiveChannelException
+import kotlinx.coroutines.experimental.channels.ClosedSendChannelException
 import kotlinx.coroutines.experimental.io.internal.*
 import kotlinx.coroutines.experimental.io.packet.*
-import java.nio.*
-import java.util.concurrent.atomic.*
+import kotlinx.coroutines.experimental.suspendCancellableCoroutine
+import java.nio.BufferOverflowException
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater
 
 // implementation for ByteChannel
 internal class ByteBufferChannel(
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannel.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannel.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannel.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannel.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelCoroutine.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelCoroutine.kt
similarity index 69%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelCoroutine.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelCoroutine.kt
index f4803e5..cc12417 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelCoroutine.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteChannelCoroutine.kt
@@ -1,7 +1,9 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import kotlin.coroutines.experimental.*
+import kotlinx.coroutines.experimental.AbstractCoroutine
+import kotlinx.coroutines.experimental.JobSupport
+import kotlinx.coroutines.experimental.handleCoroutineException
+import kotlin.coroutines.experimental.CoroutineContext
 
 internal open class ByteChannelCoroutine(
     parentContext: CoroutineContext,
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteOrder.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteOrder.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteOrder.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteOrder.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteReadChannel.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteReadChannel.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteReadChannel.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteReadChannel.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteWriteChannel.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteWriteChannel.kt
similarity index 97%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteWriteChannel.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteWriteChannel.kt
index d654e29..ca5252b 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteWriteChannel.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ByteWriteChannel.kt
@@ -1,6 +1,7 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.io.packet.*
+import kotlinx.coroutines.experimental.io.packet.ByteReadPacket
+import kotlinx.coroutines.experimental.io.packet.buildPacket
 import java.nio.ByteBuffer
 import java.nio.CharBuffer
 import java.util.concurrent.CancellationException
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/MigrationUtils.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/MigrationUtils.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/MigrationUtils.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/MigrationUtils.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ReaderJob.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ReaderJob.kt
similarity index 79%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ReaderJob.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ReaderJob.kt
index e88adb5..189004d 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ReaderJob.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/ReaderJob.kt
@@ -1,7 +1,10 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import kotlin.coroutines.experimental.*
+import kotlinx.coroutines.experimental.CoroutineScope
+import kotlinx.coroutines.experimental.Job
+import kotlinx.coroutines.experimental.newCoroutineContext
+import kotlin.coroutines.experimental.CoroutineContext
+import kotlin.coroutines.experimental.startCoroutine
 
 /**
  * A coroutine job that is reading from a byte channel
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/Strings.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/Strings.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/Strings.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/Strings.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/WriterJob.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/WriterJob.kt
similarity index 79%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/WriterJob.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/WriterJob.kt
index 00e2f71..fb144ac 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/WriterJob.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/WriterJob.kt
@@ -1,7 +1,10 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import kotlin.coroutines.experimental.*
+import kotlinx.coroutines.experimental.CoroutineScope
+import kotlinx.coroutines.experimental.Job
+import kotlinx.coroutines.experimental.newCoroutineContext
+import kotlin.coroutines.experimental.CoroutineContext
+import kotlin.coroutines.experimental.startCoroutine
 
 /**
  * A coroutine job that is writing to a byte channel
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ObjectPool.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ObjectPool.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ObjectPool.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ObjectPool.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ReadWriteBufferState.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ReadWriteBufferState.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ReadWriteBufferState.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/ReadWriteBufferState.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/RingBufferCapacity.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/RingBufferCapacity.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/RingBufferCapacity.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/RingBufferCapacity.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Strings.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Strings.kt
similarity index 97%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Strings.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Strings.kt
index 06161ab..eaff9c9 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Strings.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Strings.kt
@@ -1,7 +1,7 @@
 package kotlinx.coroutines.experimental.io.internal
 
-import java.nio.*
-import java.nio.charset.*
+import java.nio.ByteBuffer
+import java.nio.charset.MalformedInputException
 
 /**
  * Decodes all the bytes to ASCII characters until end of buffer applying every character to [consumer]
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Utils.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Utils.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Utils.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/internal/Utils.kt
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacket.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacket.kt
similarity index 91%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacket.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacket.kt
index 62ce16b..7e5976b 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacket.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacket.kt
@@ -1,8 +1,8 @@
 package kotlinx.coroutines.experimental.io.packet
 
-import java.io.*
-import java.nio.*
-import kotlin.experimental.*
+import java.io.InputStream
+import java.nio.ByteBuffer
+import kotlin.experimental.and
 
 interface ByteReadPacket {
     val remaining: Int
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketEmpty.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketEmpty.kt
similarity index 96%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketEmpty.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketEmpty.kt
index c278890..8834191 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketEmpty.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketEmpty.kt
@@ -1,7 +1,8 @@
 package kotlinx.coroutines.experimental.io.packet
 
-import java.io.*
-import java.nio.*
+import java.io.EOFException
+import java.io.InputStream
+import java.nio.ByteBuffer
 
 object ByteReadPacketEmpty : ByteReadPacket {
     override val remaining: Int
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketImpl.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketImpl.kt
similarity index 95%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketImpl.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketImpl.kt
index dd9fad2..61c3717 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketImpl.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketImpl.kt
@@ -2,10 +2,13 @@
 
 package kotlinx.coroutines.experimental.io.packet
 
-import kotlinx.coroutines.experimental.io.internal.*
-import java.io.*
-import java.nio.*
-import java.nio.charset.*
+import kotlinx.coroutines.experimental.io.internal.ObjectPool
+import kotlinx.coroutines.experimental.io.internal.decodeUTF8
+import java.io.EOFException
+import java.io.InputStream
+import java.nio.BufferOverflowException
+import java.nio.ByteBuffer
+import java.nio.charset.MalformedInputException
 import java.util.*
 
 internal class ByteReadPacketImpl(private val packets: ArrayDeque<ByteBuffer>, internal val pool: ObjectPool<ByteBuffer>) : ByteReadPacket {
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketSingle.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketSingle.kt
similarity index 94%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketSingle.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketSingle.kt
index 5b4c28b..1377a62 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketSingle.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteReadPacketSingle.kt
@@ -1,9 +1,12 @@
 package kotlinx.coroutines.experimental.io.packet
 
-import kotlinx.coroutines.experimental.io.internal.*
-import java.io.*
-import java.nio.*
-import java.nio.charset.*
+import kotlinx.coroutines.experimental.io.internal.ObjectPool
+import kotlinx.coroutines.experimental.io.internal.decodeUTF8
+import java.io.EOFException
+import java.io.InputStream
+import java.nio.BufferOverflowException
+import java.nio.ByteBuffer
+import java.nio.charset.MalformedInputException
 
 internal class ByteReadPacketSingle(private var buffer: ByteBuffer?, internal val pool: ObjectPool<ByteBuffer>) : ByteReadPacket {
     override val remaining: Int
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacket.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacket.kt
similarity index 90%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacket.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacket.kt
index 564be91..ccf83b4 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacket.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacket.kt
@@ -1,7 +1,8 @@
 package kotlinx.coroutines.experimental.io.packet
 
-import java.io.*
-import java.nio.*
+import java.io.OutputStream
+import java.nio.ByteBuffer
+import java.nio.CharBuffer
 
 interface ByteWritePacket : Appendable {
     fun writeFully(src: ByteArray, offset: Int, length: Int)
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacketImpl.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacketImpl.kt
similarity index 97%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacketImpl.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacketImpl.kt
index 562c27a..038c66c 100644
--- a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacketImpl.kt
+++ b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/ByteWritePacketImpl.kt
@@ -1,8 +1,9 @@
 package kotlinx.coroutines.experimental.io.packet
 
-import kotlinx.coroutines.experimental.io.internal.*
-import java.io.*
-import java.nio.*
+import kotlinx.coroutines.experimental.io.internal.ObjectPool
+import java.io.OutputStream
+import java.nio.ByteBuffer
+import java.nio.CharBuffer
 import java.util.*
 
 internal class ByteWritePacketImpl(private val pool: ObjectPool<ByteBuffer>) : ByteWritePacket {
diff --git a/integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/Packets.kt b/core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/Packets.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/Packets.kt
rename to core/kotlinx-coroutines-io/src/main/kotlin/kotlinx/coroutines/experimental/io/packet/Packets.kt
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelScenarioTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelScenarioTest.kt
similarity index 91%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelScenarioTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelScenarioTest.kt
index 6c7021e..fe70122 100644
--- a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelScenarioTest.kt
+++ b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelScenarioTest.kt
@@ -1,10 +1,14 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import kotlinx.coroutines.experimental.channels.*
-import org.junit.*
-import java.io.*
-import kotlin.test.*
+import kotlinx.coroutines.experimental.TestBase
+import kotlinx.coroutines.experimental.channels.ClosedReceiveChannelException
+import kotlinx.coroutines.experimental.launch
+import kotlinx.coroutines.experimental.runBlocking
+import kotlinx.coroutines.experimental.yield
+import org.junit.Test
+import java.io.IOException
+import kotlin.test.assertEquals
+import kotlin.test.fail
 
 class ByteBufferChannelScenarioTest : TestBase() {
     private val ch = ByteBufferChannel(true)
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelTest.kt
similarity index 94%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelTest.kt
index 00ab358..9f75542 100644
--- a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelTest.kt
+++ b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ByteBufferChannelTest.kt
@@ -1,16 +1,27 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import kotlinx.coroutines.experimental.channels.*
-import kotlinx.coroutines.experimental.io.internal.*
-import kotlinx.coroutines.experimental.io.packet.*
-import org.junit.*
-import org.junit.rules.*
-import java.nio.*
+import kotlinx.coroutines.experimental.CommonPool
+import kotlinx.coroutines.experimental.CoroutineName
+import kotlinx.coroutines.experimental.channels.ClosedReceiveChannelException
+import kotlinx.coroutines.experimental.io.internal.BUFFER_SIZE
+import kotlinx.coroutines.experimental.io.internal.BufferObjectNoPool
+import kotlinx.coroutines.experimental.io.internal.RESERVED_SIZE
+import kotlinx.coroutines.experimental.io.packet.buildPacket
+import kotlinx.coroutines.experimental.io.packet.readUTF8Line
+import kotlinx.coroutines.experimental.launch
+import kotlinx.coroutines.experimental.runBlocking
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.ErrorCollector
+import org.junit.rules.Timeout
 import java.nio.ByteBuffer
+import java.nio.CharBuffer
 import java.util.*
-import java.util.concurrent.*
-import kotlin.test.*
+import java.util.concurrent.TimeUnit
+import kotlin.test.assertEquals
+import kotlin.test.assertNotEquals
+import kotlin.test.assertTrue
+import kotlin.test.fail
 
 class ByteBufferChannelTest {
     @get:Rule
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/BytePacketBuildTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/BytePacketBuildTest.kt
similarity index 90%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/BytePacketBuildTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/BytePacketBuildTest.kt
index b7de477..4d18a72 100644
--- a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/BytePacketBuildTest.kt
+++ b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/BytePacketBuildTest.kt
@@ -1,8 +1,9 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.io.packet.*
-import org.junit.*
-import kotlin.test.*
+import kotlinx.coroutines.experimental.io.packet.buildPacket
+import kotlinx.coroutines.experimental.io.packet.readUTF8Line
+import org.junit.Test
+import kotlin.test.assertEquals
 
 class BytePacketBuildTest {
     @Test
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ContentByteBufferTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ContentByteBufferTest.kt
similarity index 100%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ContentByteBufferTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/ContentByteBufferTest.kt
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/CopyAndCloseTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/CopyAndCloseTest.kt
similarity index 81%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/CopyAndCloseTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/CopyAndCloseTest.kt
index 0ba8742..5e2b235 100644
--- a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/CopyAndCloseTest.kt
+++ b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/CopyAndCloseTest.kt
@@ -1,9 +1,13 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import org.junit.*
-import java.io.*
-import kotlin.test.*
+import kotlinx.coroutines.experimental.TestBase
+import kotlinx.coroutines.experimental.launch
+import kotlinx.coroutines.experimental.runBlocking
+import kotlinx.coroutines.experimental.yield
+import org.junit.Test
+import java.io.IOException
+import kotlin.test.assertEquals
+import kotlin.test.fail
 
 class CopyAndCloseTest : TestBase() {
     private val from = ByteChannel(true)
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/PooledBufferTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/PooledBufferTest.kt
similarity index 98%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/PooledBufferTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/PooledBufferTest.kt
index d8d15a0..33b77e6 100644
--- a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/PooledBufferTest.kt
+++ b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/PooledBufferTest.kt
@@ -5,7 +5,7 @@
 import kotlinx.coroutines.experimental.runBlocking
 import org.junit.After
 import org.junit.Test
-import java.io.*
+import java.io.IOException
 import java.nio.ByteBuffer
 import java.util.concurrent.CopyOnWriteArrayList
 import kotlin.test.assertEquals
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringScenarioTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringScenarioTest.kt
similarity index 92%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringScenarioTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringScenarioTest.kt
index 0056874..3ccd35e 100644
--- a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringScenarioTest.kt
+++ b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringScenarioTest.kt
@@ -1,10 +1,15 @@
 package kotlinx.coroutines.experimental.io
 
-import kotlinx.coroutines.experimental.*
-import org.junit.*
-import org.junit.rules.*
-import java.util.concurrent.*
-import kotlin.test.*
+import kotlinx.coroutines.experimental.TestBase
+import kotlinx.coroutines.experimental.launch
+import kotlinx.coroutines.experimental.runBlocking
+import kotlinx.coroutines.experimental.yield
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.Timeout
+import java.util.concurrent.TimeUnit
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
 
 class StringScenarioTest : TestBase() {
     @get:Rule
diff --git a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringsTest.kt b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringsTest.kt
similarity index 96%
rename from integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringsTest.kt
rename to core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringsTest.kt
index 49a3656..ca7ee86 100644
--- a/integration/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringsTest.kt
+++ b/core/kotlinx-coroutines-io/src/test/kotlin/kotlinx/coroutines/experimental/io/StringsTest.kt
@@ -1,11 +1,15 @@
 package kotlinx.coroutines.experimental.io
 
 import kotlinx.coroutines.experimental.*
-import org.junit.*
-import org.junit.rules.*
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.Timeout
 import java.util.*
-import java.util.concurrent.*
-import kotlin.test.*
+import java.util.concurrent.TimeUnit
+import kotlin.test.assertEquals
+import kotlin.test.assertNotEquals
+import kotlin.test.assertNull
+import kotlin.test.fail
 
 class StringsTest {
     @get:Rule
diff --git a/pom.xml b/pom.xml
index c29c5e0..b6097c6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -120,6 +120,7 @@
         <module>site</module>
         <module>knit</module>
         <module>core/kotlinx-coroutines-core</module>
+        <module>core/kotlinx-coroutines-io</module>
         <module>reactive/kotlinx-coroutines-reactive</module>
         <module>reactive/kotlinx-coroutines-reactor</module>
         <module>reactive/kotlinx-coroutines-rx1</module>
diff --git a/site/build.xml b/site/build.xml
index a738724..b6e616e 100644
--- a/site/build.xml
+++ b/site/build.xml
@@ -34,6 +34,7 @@
         <copy todir="target">
             <fileset dir="docs"/>
             <fileset dir="../core/kotlinx-coroutines-core/target/dokka" includes="**/*.md"/>
+            <fileset dir="../core/kotlinx-coroutines-io/target/dokka" includes="**/*.md"/>
             <fileset dir="../reactive/kotlinx-coroutines-reactive/target/dokka" includes="**/*.md"/>
             <fileset dir="../reactive/kotlinx-coroutines-reactor/target/dokka" includes="**/*.md"/>
             <fileset dir="../reactive/kotlinx-coroutines-rx1/target/dokka" includes="**/*.md"/>
diff --git a/site/docs/index.md b/site/docs/index.md
index 39057bd..3aff530 100644
--- a/site/docs/index.md
+++ b/site/docs/index.md
@@ -11,6 +11,7 @@
 ## Modules
 
 [kotlinx-coroutines-core](kotlinx-coroutines-core)         | Core primitives to work with coroutines
+[kotlinx-coroutines-io](kotlinx-coroutines-io)             | Byte I/O channels (_unstable_, work in progress) 
 [kotlinx-coroutines-reactive](kotlinx-coroutines-reactive) | Utilities for [Reactive Streams](http://www.reactive-streams.org)
 [kotlinx-coroutines-reactor](kotlinx-coroutines-reactor)   | Utilities for [Reactor](https://projectreactor.io)
 [kotlinx-coroutines-rx1](kotlinx-coroutines-rx1)           | Utilities for [RxJava 1.x](https://github.com/ReactiveX/RxJava/tree/1.x)