diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/App.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/App.kt
index 94b3725..ac8098a 100644
--- a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/App.kt
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/App.kt
@@ -1,23 +1,43 @@
 package com.jaytux.grader
 
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Surface
+import androidx.compose.foundation.layout.*
+import androidx.compose.material3.*
 import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
+import com.jaytux.grader.ui.ChevronLeft
 import com.jaytux.grader.ui.CoursesView
+import com.jaytux.grader.ui.toDp
 import com.jaytux.grader.viewmodel.CourseListState
 import org.jetbrains.compose.ui.tooling.preview.Preview
 
+data class UiRoute(val heading: String, val content: @Composable (push: (UiRoute) -> Unit) -> Unit)
+
 @Composable
 @Preview
 fun App() {
     MaterialTheme {
         val courseList = CourseListState()
-        Surface(Modifier.fillMaxSize().padding(10.dp)) {
-            CoursesView(courseList)
+        var stack by remember {
+            val start = UiRoute("Courses Overview") { CoursesView(courseList, it) }
+            mutableStateOf(listOf(start))
+        }
+
+        Column {
+            Surface(Modifier.fillMaxWidth(), color = MaterialTheme.colorScheme.primary, tonalElevation = 10.dp, shadowElevation = 10.dp) {
+                Row(Modifier.padding(10.dp)) {
+                    IconButton({ stack = stack.toMutableList().also { it.removeLast() } }, enabled = stack.size >= 2) {
+                        Icon(ChevronLeft, "Back", Modifier.size(MaterialTheme.typography.headlineLarge.fontSize.toDp()))
+                    }
+                    Text(stack.last().heading, Modifier.align(Alignment.CenterVertically), style = MaterialTheme.typography.headlineLarge)
+                }
+            }
+            Surface(Modifier.fillMaxSize()) {
+                Box(Modifier.padding(10.dp)) {
+                    stack.last().content { stack += (it) }
+                }
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/DSL.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/DSL.kt
index ac4e2fe..a04d557 100644
--- a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/DSL.kt
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/DSL.kt
@@ -28,17 +28,19 @@ object Groups : UUIDTable("groups") {
 
 object Students : UUIDTable("students") {
     val name = varchar("name", 50)
+    val contact = varchar("contact", 50)
     val note = text("note")
 }
 
-object GroupStudents : Table("grpStudents") {
+object GroupStudents : CompositeIdTable("grpStudents") {
     val groupId = reference("group_id", Groups.id)
     val studentId = reference("student_id", Students.id)
+    val role = varchar("role", 50).nullable()
 
     override val primaryKey = PrimaryKey(groupId, studentId)
 }
 
-object SoloStudents : Table("soloStudents") {
+object EditionStudents : Table("editionStudents") {
     val editionId = reference("edition_id", Editions.id)
     val studentId = reference("student_id", Students.id)
 
@@ -46,15 +48,15 @@ object SoloStudents : Table("soloStudents") {
 }
 
 object GroupAssignments : UUIDTable("grpAssgmts") {
-    val editionId = reference("edition_id_", Editions.id)
-    val name = varchar("name_", 50)
-    val assignment = text("assignment_")
+    val editionId = reference("edition_id", Editions.id)
+    val name = varchar("name", 50)
+    val assignment = text("assignment")
 }
 
 object SoloAssignments : UUIDTable("soloAssgmts") {
-    val editionId = GroupAssignments.reference("edition_id", Editions.id)
-    val name = GroupAssignments.varchar("name", 50)
-    val assignment = GroupAssignments.text("assignment")
+    val editionId = reference("edition_id", Editions.id)
+    val name = varchar("name", 50)
+    val assignment = text("assignment")
 }
 
 object GroupFeedbacks : CompositeIdTable("grpFdbks") {
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Database.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Database.kt
index 2e825bd..3f0a272 100644
--- a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Database.kt
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Database.kt
@@ -10,7 +10,7 @@ object Database {
         transaction {
             SchemaUtils.create(
                 Courses, Editions, Groups,
-                Students, GroupStudents, SoloStudents,
+                Students, GroupStudents, EditionStudents,
                 GroupAssignments, SoloAssignments,
                 GroupFeedbacks, IndividualFeedbacks, SoloFeedbacks
             )
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Entities.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Entities.kt
index 32cee68..4f343b2 100644
--- a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Entities.kt
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/data/Entities.kt
@@ -21,7 +21,9 @@ class Edition(id: EntityID<UUID>) : Entity<UUID>(id) {
     var course by Course referencedOn Editions.courseId
     var name by Editions.name
     val groups by Group referrersOn Groups.editionId
-    val soloStudents by Student via SoloStudents
+    val soloStudents by Student via EditionStudents
+    val soloAssignments by SoloAssignment referrersOn SoloAssignments.editionId
+//    val groupAssignments by GroupAssignment referrersOn GroupAssignments.editionId
 }
 
 class Group(id: EntityID<UUID>) : Entity<UUID>(id) {
@@ -37,8 +39,9 @@ class Student(id: EntityID<UUID>) : Entity<UUID>(id) {
 
     var name by Students.name
     var note by Students.note
+    var contact by Students.contact
     val groups by Group via GroupStudents
-    val soloCourses by Edition via SoloStudents
+    val courses by Edition via EditionStudents
 }
 
 class GroupAssignment(id: EntityID<UUID>) : Entity<UUID>(id) {
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Courses.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Courses.kt
index 98f849b..24f9da3 100644
--- a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Courses.kt
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Courses.kt
@@ -1,5 +1,6 @@
 package com.jaytux.grader.ui
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
@@ -9,7 +10,6 @@ import androidx.compose.material.OutlinedTextField
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material.icons.filled.Edit
-import androidx.compose.material.icons.filled.PlayArrow
 import androidx.compose.material3.Button
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
@@ -20,12 +20,17 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontStyle
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.window.*
-import com.jaytux.grader.data.Course
+import androidx.compose.ui.window.DialogWindow
+import androidx.compose.ui.window.WindowPosition
+import androidx.compose.ui.window.rememberDialogState
+import com.jaytux.grader.UiRoute
+import com.jaytux.grader.data.Edition
 import com.jaytux.grader.viewmodel.CourseListState
+import com.jaytux.grader.viewmodel.EditionListState
+import com.jaytux.grader.viewmodel.EditionState
 
 @Composable
-fun CoursesView(state: CourseListState) {
+fun CoursesView(state: CourseListState, push: (UiRoute) -> Unit) {
     val data by state.courses.entities
     var showDialog by remember { mutableStateOf(false) }
 
@@ -41,7 +46,7 @@ fun CoursesView(state: CourseListState) {
     }
     else {
         LazyColumn(Modifier.fillMaxSize()) {
-            items(data) { CourseWidget(it) { state.delete(it) } }
+            items(data) { CourseWidget(state.getEditions(it), { state.delete(it) }, push) }
 
             item {
                 Button({ showDialog = true }, Modifier.fillMaxWidth()) {
@@ -51,45 +56,71 @@ fun CoursesView(state: CourseListState) {
         }
     }
 
-    if(showDialog) AddCourseDialog(data.map { it.name }, { showDialog = false }) { state.new(it) }
+    if(showDialog) AddStringDialog("Course name", data.map { it.name }, { showDialog = false }) { state.new(it) }
 }
 
 @Composable
-fun AddCourseDialog(taken: List<String>, onClose: () -> Unit, onSave: (String) -> Unit) = DialogWindow(
-    onCloseRequest = onClose,
-    state = rememberDialogState(size = DpSize(400.dp, 300.dp), position = WindowPosition(Alignment.Center))
-) {
-    Surface(Modifier.fillMaxSize().padding(10.dp)) {
-        Box(Modifier.fillMaxSize()) {
-            var name by remember { mutableStateOf("") }
-            Column(Modifier.align(Alignment.Center)) {
-                OutlinedTextField(name, { name = it }, Modifier.fillMaxWidth(), label = { Text("Course name") }, isError = name in taken)
-                Row {
-                    Button({ onClose() }, Modifier.weight(0.45f)) { Text("Cancel") }
-                    Spacer(Modifier.weight(0.1f))
-                    Button({ onSave(name); onClose() }, Modifier.weight(0.45f)) { Text("Save") }
-                }
-            }
+fun CourseWidget(state: EditionListState, onDelete: () -> Unit, push: (UiRoute) -> Unit) {
+    val editions by state.editions.entities
+    var isOpened by remember { mutableStateOf(false) }
+    var showDialog by remember { mutableStateOf(false) }
+
+    val callback = { it: Edition ->
+        val s = EditionState(it)
+        val route = UiRoute("${state.course.name}: ${it.name}") {
+            EditionView(s)
         }
+        push(route)
     }
-}
 
-@Composable
-fun CourseWidget(course: Course, onDelete: () -> Unit) {
-    val editions = remember(course) { course.loadEditions().size }
-    Surface(Modifier.fillMaxWidth().padding(horizontal = 5.dp, vertical = 10.dp), shape = MaterialTheme.shapes.medium, tonalElevation = 2.dp, shadowElevation = 2.dp) {
+    Surface(Modifier.fillMaxWidth().padding(horizontal = 5.dp, vertical = 10.dp).clickable { isOpened = !isOpened }, shape = MaterialTheme.shapes.medium, tonalElevation = 2.dp, shadowElevation = 2.dp) {
         Row {
-            Column(Modifier.weight(1f)) {
-                Text(course.name, Modifier.padding(5.dp), style = MaterialTheme.typography.headlineMedium)
+            Column(Modifier.weight(1f).padding(5.dp)) {
                 Row {
-                    Spacer(Modifier.width(15.dp))
-                    Text("$editions editions", fontStyle = FontStyle.Italic)
+                    Icon(
+                        if (isOpened) ChevronDown else ChevronRight, "Toggle editions",
+                        Modifier.size(MaterialTheme.typography.headlineMedium.fontSize.toDp())
+                            .align(Alignment.CenterVertically)
+                    )
+                    Column {
+                        Text(state.course.name, style = MaterialTheme.typography.headlineMedium)
+                    }
+                }
+                Row {
+                    Spacer(Modifier.width(25.dp))
+                    Text(
+                        "${editions.size} edition(s)",
+                        fontStyle = FontStyle.Italic,
+                        style = MaterialTheme.typography.bodySmall
+                    )
+                }
+
+                if(isOpened) {
+                    Row {
+                        Spacer(Modifier.width(25.dp))
+                        Column {
+                            editions.forEach { EditionWidget(it, { callback(it) }) { state.delete(it) } }
+                            Button({ showDialog = true }, Modifier.fillMaxWidth()) { Text("Add edition") }
+                        }
+                    }
                 }
             }
             Column {
                 IconButton({ onDelete() }) { Icon(Icons.Default.Delete, "Remove") }
-                IconButton({ TODO() }) { Icon(Icons.Default.Edit, "Edit") }
+                IconButton({ TODO() }, enabled = false) { Icon(Icons.Default.Edit, "Edit") }
             }
         }
     }
+
+    if(showDialog) AddStringDialog("Edition name", editions.map { it.name }, { showDialog = false }) { state.new(it) }
+}
+
+@Composable
+fun EditionWidget(edition: Edition, onOpen: () -> Unit, onDelete: () -> Unit) {
+    Surface(Modifier.fillMaxWidth().padding(horizontal = 5.dp, vertical = 10.dp).clickable { onOpen() }, shape = MaterialTheme.shapes.medium, tonalElevation = 2.dp, shadowElevation = 2.dp) {
+        Row(Modifier.padding(5.dp)) {
+            Text(edition.name, Modifier.weight(1f), style = MaterialTheme.typography.headlineSmall)
+            IconButton({ onDelete() }) { Icon(Icons.Default.Delete, "Remove") }
+        }
+    }
 }
\ No newline at end of file
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Editions.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Editions.kt
new file mode 100644
index 0000000..a4f02aa
--- /dev/null
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Editions.kt
@@ -0,0 +1,186 @@
+package com.jaytux.grader.ui
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.material.Checkbox
+import androidx.compose.material.OutlinedTextField
+import androidx.compose.material3.Button
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.runtime.*
+import androidx.compose.material3.Text
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.DialogWindow
+import androidx.compose.ui.window.WindowPosition
+import androidx.compose.ui.window.rememberDialogState
+import com.jaytux.grader.data.*
+import com.jaytux.grader.viewmodel.EditionState
+
+@Composable
+fun EditionView(state: EditionState) = Row {
+    var isGroup by remember { mutableStateOf(false) }
+
+    val students by state.students.entities
+    val groups by state.groups.entities
+    val solo by state.solo.entities
+    val groupAs by state.groupAs//.entities
+
+    TabLayout(
+        listOf("Students", "Groups"),
+        if(isGroup) 1 else 0,
+        { isGroup = it == 1 },
+        { Text(it) },
+        Modifier.weight(0.25f)
+    ) {
+        Column(Modifier.fillMaxSize()) {
+            if(isGroup) {
+                Box(Modifier.weight(0.5f)) {
+                    GroupsWidget(state.course, state.edition, groups, {}) { state.newGroup(it) }
+                }
+                Box(Modifier.weight(0.5f)) { GroupAssignmentsWidget(groupAs, {}) {} }
+            }
+            else {
+                Box(Modifier.weight(0.5f)) {
+                    StudentsWidget(state.course, state.edition, students, {}) { name, note, contact, addToEdition ->
+                        state.newStudent(name, note, contact, addToEdition)
+                    }
+                }
+                Box(Modifier.weight(0.5f)) { AssignmentsWidget(solo, {}) {} }
+            }
+        }
+    }
+    Box(Modifier.weight(0.75f)) {}
+}
+
+@Composable
+fun StudentsWidget(
+    course: Course,
+    edition: Edition,
+    students: List<Student>,
+    onSelect: (Int) -> Unit,
+    onAdd: (name: String, note: String, contact: String, addToEdition: Boolean) -> Unit
+) = Column(Modifier.padding(10.dp)) {
+    Text("Student list", style = MaterialTheme.typography.headlineMedium)
+    var showDialog by remember { mutableStateOf(false) }
+    if(students.isEmpty()) {
+        Box(Modifier.fillMaxSize()) {
+            Column(Modifier.align(Alignment.Center)) {
+                Text(
+                    "Course ${course.name} (edition ${edition.name})\nhas no students yet.",
+                    Modifier.align(Alignment.CenterHorizontally),
+                    textAlign = TextAlign.Center
+                )
+                Button({ showDialog = true }, Modifier.align(Alignment.CenterHorizontally)) {
+                    Text("Add a student")
+                }
+            }
+        }
+    }
+    else {
+        LazyColumn(Modifier.padding(5.dp).weight(1f)) {
+            itemsIndexed(students) { idx, it ->
+                Surface(Modifier.fillMaxWidth().clickable { onSelect(idx) }) {
+                    Text(it.name, Modifier.padding(5.dp))
+                }
+            }
+        }
+
+        Button({ showDialog = true }, Modifier.fillMaxWidth()) {
+            Text("Add a student")
+        }
+    }
+
+    if(showDialog) StudentDialog(course, edition, { showDialog = false }, onAdd)
+}
+
+@Composable
+fun StudentDialog(
+    course: Course,
+    edition: Edition,
+    onClose: () -> Unit,
+    onAdd: (name: String, note: String, contact: String, addToEdition: Boolean) -> Unit
+) = DialogWindow(
+    onCloseRequest = onClose,
+    state = rememberDialogState(size = DpSize(600.dp, 400.dp), position = WindowPosition(Alignment.Center))
+) {
+    Surface(Modifier.fillMaxSize().padding(10.dp)) {
+        Box(Modifier.fillMaxSize()) {
+            var name by remember { mutableStateOf("") }
+            var contact by remember { mutableStateOf("") }
+            var note by remember { mutableStateOf("") }
+            var add by remember { mutableStateOf(true) }
+
+            Column(Modifier.align(Alignment.Center)) {
+                OutlinedTextField(name, { name = it }, Modifier.fillMaxWidth(), singleLine = true, label = { Text("Student name") })
+                OutlinedTextField(contact, { contact = it }, Modifier.fillMaxWidth(), singleLine = true, label = { Text("Student contact") })
+                OutlinedTextField(note, { note = it }, Modifier.fillMaxWidth(), singleLine = false, minLines = 3, label = { Text("Note") })
+                Row {
+                    Checkbox(add, { add = it })
+                    Text("Add student to ${course.name} ${edition.name}?", Modifier.align(Alignment.CenterVertically))
+                }
+                CancelSaveRow(name.isNotBlank() && contact.isNotBlank(), onClose) {
+                    onAdd(name, note, contact, add)
+                    onClose()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun GroupsWidget(
+    course: Course,
+    edition: Edition,
+    groups: List<Group>,
+    onSelect: (Int) -> Unit,
+    onAdd: (name: String) -> Unit
+) = Column(Modifier.padding(10.dp)) {
+    Text("Group list", style = MaterialTheme.typography.headlineMedium)
+    var showDialog by remember { mutableStateOf(false) }
+
+    if(groups.isEmpty()) {
+        Box(Modifier.fillMaxSize()) {
+            Column(Modifier.align(Alignment.Center)) {
+                Text(
+                    "Course ${course.name} (edition ${edition.name})\nhas no groups yet.",
+                    Modifier.align(Alignment.CenterHorizontally),
+                    textAlign = TextAlign.Center
+                )
+                Button({ showDialog = true }, Modifier.align(Alignment.CenterHorizontally)) {
+                    Text("Add a group")
+                }
+            }
+        }
+    }
+    else {
+        LazyColumn(Modifier.padding(5.dp).weight(1f)) {
+            itemsIndexed(groups) { idx, it ->
+                Surface(Modifier.fillMaxWidth().clickable { onSelect(idx) }) {
+                    Text(it.name, Modifier.padding(5.dp))
+                }
+            }
+        }
+
+        Button({ showDialog = true }, Modifier.fillMaxWidth()) {
+            Text("Add a group")
+        }
+    }
+
+    if(showDialog) AddStringDialog("Group name", groups.map { it.name }, { showDialog = false }) { onAdd(it) }
+}
+
+@Composable
+fun AssignmentsWidget(assignments: List<SoloAssignment>, onSelect: (Int) -> Unit, onAdd: (name: String) -> Unit) {
+    //
+}
+
+@Composable
+fun GroupAssignmentsWidget(assignments: List<GroupAssignment>, onSelect: (Int) -> Unit, onAdd: (name: String) -> Unit) {
+    //
+}
\ No newline at end of file
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Icons.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Icons.kt
new file mode 100644
index 0000000..fe5507f
--- /dev/null
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Icons.kt
@@ -0,0 +1,88 @@
+package com.jaytux.grader.ui
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.PathFillType
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.graphics.StrokeCap
+import androidx.compose.ui.graphics.StrokeJoin
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.graphics.vector.path
+import androidx.compose.ui.unit.dp
+
+val ChevronRight: ImageVector by lazy {
+    ImageVector.Builder(
+        name = "ChevronRight",
+        defaultWidth = 24.dp,
+        defaultHeight = 24.dp,
+        viewportWidth = 24f,
+        viewportHeight = 24f
+    ).apply {
+        path(
+            fill = null,
+            fillAlpha = 1.0f,
+            stroke = SolidColor(Color(0xFF000000)),
+            strokeAlpha = 1.0f,
+            strokeLineWidth = 2f,
+            strokeLineCap = StrokeCap.Round,
+            strokeLineJoin = StrokeJoin.Round,
+            strokeLineMiter = 1.0f,
+            pathFillType = PathFillType.NonZero
+        ) {
+            moveTo(9f, 18f)
+            lineToRelative(6f, -6f)
+            lineToRelative(-6f, -6f)
+        }
+    }.build()
+}
+
+val ChevronDown: ImageVector by lazy {
+    ImageVector.Builder(
+        name = "ChevronDown",
+        defaultWidth = 24.dp,
+        defaultHeight = 24.dp,
+        viewportWidth = 24f,
+        viewportHeight = 24f
+    ).apply {
+        path(
+            fill = null,
+            fillAlpha = 1.0f,
+            stroke = SolidColor(Color(0xFF000000)),
+            strokeAlpha = 1.0f,
+            strokeLineWidth = 2f,
+            strokeLineCap = StrokeCap.Round,
+            strokeLineJoin = StrokeJoin.Round,
+            strokeLineMiter = 1.0f,
+            pathFillType = PathFillType.NonZero
+        ) {
+            moveTo(6f, 9f)
+            lineToRelative(6f, 6f)
+            lineToRelative(6f, -6f)
+        }
+    }.build()
+}
+
+public val ChevronLeft: ImageVector by lazy {
+    ImageVector.Builder(
+        name = "ChevronLeft",
+        defaultWidth = 24.dp,
+        defaultHeight = 24.dp,
+        viewportWidth = 24f,
+        viewportHeight = 24f
+    ).apply {
+        path(
+            fill = null,
+            fillAlpha = 1.0f,
+            stroke = SolidColor(Color(0xFF000000)),
+            strokeAlpha = 1.0f,
+            strokeLineWidth = 2f,
+            strokeLineCap = StrokeCap.Round,
+            strokeLineJoin = StrokeJoin.Round,
+            strokeLineMiter = 1.0f,
+            pathFillType = PathFillType.NonZero
+        ) {
+            moveTo(15f, 18f)
+            lineToRelative(-6f, -6f)
+            lineToRelative(6f, -6f)
+        }
+    }.build()
+}
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Util.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Util.kt
new file mode 100644
index 0000000..208ae64
--- /dev/null
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Util.kt
@@ -0,0 +1,9 @@
+package com.jaytux.grader.ui
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.TextUnit
+
+@Composable
+fun TextUnit.toDp(): Dp = with(LocalDensity.current) { value.toDp() }
\ No newline at end of file
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Widgets.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Widgets.kt
new file mode 100644
index 0000000..788521a
--- /dev/null
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/ui/Widgets.kt
@@ -0,0 +1,67 @@
+package com.jaytux.grader.ui
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyRow
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.CornerSize
+import androidx.compose.material3.*
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.DialogWindow
+import androidx.compose.ui.window.WindowPosition
+import androidx.compose.ui.window.rememberDialogState
+
+@Composable
+fun CancelSaveRow(canSave: Boolean, onCancel: () -> Unit, onSave: () -> Unit) {
+    Row {
+        Button({ onCancel() }, Modifier.weight(0.45f)) { Text("Cancel") }
+        Spacer(Modifier.weight(0.1f))
+        Button({ onSave() }, Modifier.weight(0.45f), enabled = canSave) { Text("Save") }
+    }
+}
+
+@Composable
+fun <T> TabLayout(
+    options: List<T>,
+    currentIndex: Int,
+    onSelect: (Int) -> Unit,
+    optionContent: @Composable (T) -> Unit,
+    modifier: Modifier = Modifier,
+    content: @Composable () -> Unit
+) = Column(modifier) {
+    TabRow(currentIndex) {
+        options.forEachIndexed { idx, it ->
+            Tab(
+                selected = idx == currentIndex,
+                onClick = { onSelect(idx) },
+                text = { optionContent(it) }
+            )
+        }
+    }
+    content()
+}
+
+@Composable
+fun AddStringDialog(label: String, taken: List<String>, onClose: () -> Unit, onSave: (String) -> Unit) = DialogWindow(
+    onCloseRequest = onClose,
+    state = rememberDialogState(size = DpSize(400.dp, 300.dp), position = WindowPosition(Alignment.Center))
+) {
+    Surface(Modifier.fillMaxSize().padding(10.dp)) {
+        Box(Modifier.fillMaxSize()) {
+            var name by remember { mutableStateOf("") }
+            Column(Modifier.align(Alignment.Center)) {
+                androidx.compose.material.OutlinedTextField(name, { name = it }, Modifier.fillMaxWidth(), label = { Text(label) }, isError = name in taken)
+                CancelSaveRow(name.isNotBlank() && name !in taken, onClose) {
+                    onSave(name)
+                    onClose()
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/viewmodel/DbState.kt b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/viewmodel/DbState.kt
index f2eac2d..5170800 100644
--- a/composeApp/src/desktopMain/kotlin/com/jaytux/grader/viewmodel/DbState.kt
+++ b/composeApp/src/desktopMain/kotlin/com/jaytux/grader/viewmodel/DbState.kt
@@ -3,11 +3,10 @@ package com.jaytux.grader.viewmodel
 import androidx.compose.runtime.MutableState
 import androidx.compose.runtime.State
 import androidx.compose.runtime.mutableStateOf
-import com.jaytux.grader.data.Course
-import com.jaytux.grader.data.Edition
-import com.jaytux.grader.data.Editions
+import com.jaytux.grader.data.*
 import org.jetbrains.exposed.dao.Entity
 import org.jetbrains.exposed.sql.Transaction
+import org.jetbrains.exposed.sql.insert
 import org.jetbrains.exposed.sql.transactions.transaction
 import java.util.*
 
@@ -36,8 +35,47 @@ class CourseListState {
         transaction { course.delete() }
         courses.refresh()
     }
+
+    fun getEditions(course: Course) = EditionListState(course)
 }
 
-class EditionListState(private val course: Course) {
+class EditionListState(val course: Course) {
     val editions = RawDbState { Edition.find { Editions.courseId eq course.id }.toList() }
+
+    fun new(name: String) {
+        transaction { Edition.new { this.name = name; this.course = this@EditionListState.course } }
+        editions.refresh()
+    }
+
+    fun delete(edition: Edition) {
+        transaction { edition.delete() }
+        editions.refresh()
+    }
+}
+
+class EditionState(val edition: Edition) {
+    val course = transaction { edition.course }
+    val students = RawDbState { edition.soloStudents.toList() }
+    val groups = RawDbState { edition.groups.toList() }
+    val groupAs = mutableStateOf(listOf<GroupAssignment>())
+    val solo = RawDbState { edition.soloAssignments.toList() }
+
+    fun newStudent(name: String, contact: String, note: String, addToEdition: Boolean) {
+        transaction {
+            val student = Student.new { this.name = name; this.contact = contact; this.note = note }
+            if(addToEdition) EditionStudents.insert {
+                it[editionId] = edition.id
+                it[studentId] = student.id
+            }
+        }
+
+        if(addToEdition) students.refresh()
+    }
+
+    fun newGroup(name: String) {
+        transaction {
+            Group.new { this.name = name; this.edition = this@EditionState.edition }
+            groups.refresh()
+        }
+    }
 }
\ No newline at end of file