diff --git a/sessl-james/src/main/scala/sessl/james/Report.scala b/sessl-james/src/main/scala/sessl/james/Report.scala
index ac5e79f..08ee7e0 100644
--- a/sessl-james/src/main/scala/sessl/james/Report.scala
+++ b/sessl-james/src/main/scala/sessl/james/Report.scala
@@ -107,10 +107,10 @@ trait Report extends AbstractReport {
       case v: ScatterPlotView => new ScatterPlotDataView(to2DJavaDoubleArray(v.xData, v.yData),
         v.caption, v.title, Array[String](v.xLabel, v.yLabel))
       case v: HistogramView => new HistogramDataView(toDoubleArray(v.data), v.caption, v.title, v.xLabel, v.yLabel)
-      case v: BoxPlotView => new BoxPlotDataView(to2DJavaDoubleArray(v.data.map(_._2): _*),
-        v.caption, v.title, Array(v.xLabel, v.yLabel), Array(v.data.map(x => x._1): _*))
-      case v: LinePlotView => new LineChartDataView(to2DJavaDoubleArray(v.data.map(_._2): _*),
-        v.caption, v.title, Array(v.xLabel, v.yLabel), Array(v.data.map(x => x._1).tail: _*))
+      case v: BoxPlotView => new BoxPlotDataView(to2DJavaDoubleArray(v.data.toSeq.map(_._2): _*),
+        v.caption, v.title, Array(v.xLabel, v.yLabel), Array(v.data.toSeq.map(x => x._1): _*))
+      case v: LinePlotView => new LineChartDataView(to2DJavaDoubleArray(v.data.toSeq.map(_._2): _*),
+        v.caption, v.title, Array(v.xLabel, v.yLabel), Array(v.data.toSeq.map(x => x._1).tail: _*))
       case v: StatisticalTestView =>
         val dataPair = new org.jamesii.core.util.misc.Pair[Array[java.lang.Double], Array[java.lang.Double]](toDoubleArray(v.firstData._2), toDoubleArray(v.secondData._2))
         new StatisticalTestDataView(dataPair, v.caption, v.firstData._1, v.secondData._1, true, true, StatisticalTestDefinition.KOLMOGOROV_SMIRNOV)
diff --git a/sessl-james/src/test/scala/tests/sessl/james/TestReport.scala b/sessl-james/src/test/scala/tests/sessl/james/TestReport.scala
index 0d298a3..0721e5b 100644
--- a/sessl-james/src/test/scala/tests/sessl/james/TestReport.scala
+++ b/sessl-james/src/test/scala/tests/sessl/james/TestReport.scala
@@ -78,7 +78,7 @@ import org.junit.Assert._
     val files = new File(exp.reportName).list.toSet
     assertTrue("The directory for raw data, the auxiliary plotting methods, and the report itself should be there", files("raw") && files("plotting.R") && files("report.Rtex"))
     val dataFiles = rawDataDir.listFiles
-    assertTrue("There should be 28 files containing the raw data, and none of them should be empty.", dataFiles.length == 28 && dataFiles.forall(_.length > 0))
+    assertEquals("There should be non-empty raw data files", 28, dataFiles.filter(_.length > 0).length)
   }
 
 }
diff --git a/sessl/src/main/scala/sessl/AbstractReport.scala b/sessl/src/main/scala/sessl/AbstractReport.scala
index d5c0e92..719fcdf 100644
--- a/sessl/src/main/scala/sessl/AbstractReport.scala
+++ b/sessl/src/main/scala/sessl/AbstractReport.scala
@@ -147,9 +147,9 @@ trait AbstractReport extends ExperimentConfiguration {
   }
 
   /** Converts data items to a common format that can be used for line plots. */
-  private[this] def convertToLinePlotData(data: Iterable[Any]): List[(String, List[_])] = data.head match {
+  private[this] def convertToLinePlotData(data: Iterable[Any]): Seq[(String, Iterable[_])] = data.head match {
     case tuple: (_, _) => ("Time", tuple._2.asInstanceOf[Trajectory].map(_._1)) :: data.toList.flatMap(toNamedList)
-    case trajectory: List[_] => ("Time", trajectory.asInstanceOf[Trajectory].map(_._1)) :: data.toList.flatMap(toNamedList)
+    case trajectory: Iterable[_] => ("Time", trajectory.asInstanceOf[Trajectory].map(_._1)) :: data.toList.flatMap(toNamedList)
     case _ => data.toList.flatMap(toNamedList)
   }
 
@@ -175,22 +175,22 @@ trait AbstractReport extends ExperimentConfiguration {
    */
   def reportTable(data: Any*)(caption: String = "") = {
     val namedData = data.flatMap(toNamedList)
-    val tableData = namedData.map(x => x._1 :: x._2.map(_.toString))
-    currentSection.childs += TableView(tableData.toList, caption, currentSection)
+    val tableData = namedData.map(x => x._1 :: x._2.map(_.toString).toList)
+    currentSection.childs += TableView(tableData, caption, currentSection)
   }
 
   /** Converts an object of a suitable type into a tuple (name, list of values)*/
-  private[this] def toNamedList(data: Any): Seq[(String, List[_])] = {
+  private[this] def toNamedList(data: Any): Seq[(String, Iterable[_])] = {
     data match {
       //Because of type erasure, we have to match the types of the list content separately
-      case tuple: (_, _) => tuple._2.asInstanceOf[List[_]].head match {
+      case tuple: (_, _) => tuple._2.asInstanceOf[Iterable[_]].head match {
         case t: (_, _) => Seq((tuple._1.toString, tuple._2.asInstanceOf[Trajectory].map(_._2)))
-        case _ => Seq((tuple._1.toString, tuple._2.asInstanceOf[List[_]]))
+        case _ => Seq((tuple._1.toString, tuple._2.asInstanceOf[Iterable[_]]))
       }
       case seq: Seq[_] => seq.head match {
-        case t: (_, _) => seq.asInstanceOf[Seq[(_, List[Double])]].map(tuple => (tuple._1.toString, tuple._2))
-        case nestedSeq: Seq[_] => seq.asInstanceOf[Seq[Seq[Double]]].map(rawData => ("", rawData.toList))
-        case n: Number => Seq(("", seq.asInstanceOf[Seq[Number]].map(_.doubleValue()).toList))
+        case t: (_, _) => seq.asInstanceOf[Seq[(_, Iterable[Double])]].map(tuple => (tuple._1.toString, tuple._2))
+        case nestedSeq: Seq[_] => seq.asInstanceOf[Seq[Iterable[_]]].map(rawData => ("", rawData))
+        case n: Number => Seq(("", seq.asInstanceOf[Iterable[Number]].map(_.doubleValue()).toList))
       }
       case _ => throw new IllegalArgumentException("Entity '" + data + "' cannot be converted to a tuple (name, list of values).")
     }
@@ -205,7 +205,7 @@ trait AbstractReport extends ExperimentConfiguration {
   protected def topmostElements = rootSection.children
 
   /** Checks whether the elements in the list are numeric. */
-  private def dataIsNumeric(values: List[_]): Boolean = {
+  private def dataIsNumeric(values: Iterable[_]): Boolean = {
     val typesOK = typesConform(classOf[Number], values)
     if (!typesOK)
       logger.warn("Some elements to be plotted are not numbers, hence this plot view is skipped: " + values)
@@ -213,10 +213,10 @@ trait AbstractReport extends ExperimentConfiguration {
   }
 
   /** Checks whether the elements in all given lists are numeric. */
-  private def dataAreNumeric(data: List[_]*): Boolean = data.forall(dataIsNumeric)
+  private def dataAreNumeric(data: Iterable[_]*): Boolean = data.forall(dataIsNumeric)
 
   /** Converts a list of Any into a list of Double.*/
-  private def toDoubleList(values: List[_]) = values.asInstanceOf[List[Number]].map(_.doubleValue())
+  private def toDoubleList(values: Iterable[_]) = values.asInstanceOf[Iterable[Number]].map(_.doubleValue()).toSeq
 
   /** Needs to be realized by concrete implementations*/
   def generateReport(results: ExperimentResults): Unit
@@ -251,19 +251,19 @@ protected case class ReportSectionNode(name: String, description: String, parent
 trait DataView extends ReportNode
 
 /** Display a scatter plot. */
-case class ScatterPlotView(xData: List[Double], yData: List[Double], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
+case class ScatterPlotView(xData: Iterable[Double], yData: Iterable[Double], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
 
 /** Display a histogram. */
-case class HistogramView(data: List[Double], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
+case class HistogramView(data: Iterable[Double], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
 
 /** Display a box plot. */
-case class BoxPlotView(data: List[(String, List[Double])], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
+case class BoxPlotView(data: Iterable[(String, Iterable[Double])], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
 
 /** Display a line plot. */
-case class LinePlotView(data: List[(String, List[Double])], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
+case class LinePlotView(data: Iterable[(String, Iterable[Double])], title: String, caption: String, xLabel: String, yLabel: String, parent: ReportSection) extends DataView
 
 /** Display the results of a statistical test. */
-case class StatisticalTestView(firstData: (String, List[Double]), secondData: (String, List[Double]), caption: String, testMethod: Option[TwoPairedStatisticalTest], parent: ReportSection) extends DataView
+case class StatisticalTestView(firstData: (String, Iterable[Double]), secondData: (String, Iterable[Double]), caption: String, testMethod: Option[TwoPairedStatisticalTest], parent: ReportSection) extends DataView
 
 /** Display the results in a table. */
-case class TableView(data: List[List[String]], caption: String, parent: ReportSection) extends DataView
+case class TableView(data: Seq[Seq[String]], caption: String, parent: ReportSection) extends DataView
diff --git a/sessl/src/main/scala/sessl/util/MiscUtils.scala b/sessl/src/main/scala/sessl/util/MiscUtils.scala
index 27a779b..2e44263 100644
--- a/sessl/src/main/scala/sessl/util/MiscUtils.scala
+++ b/sessl/src/main/scala/sessl/util/MiscUtils.scala
@@ -66,7 +66,7 @@ object MiscUtils extends Logging {
    *          the values
    *  @return true, if all elements in the sequence are of this kind
    */
-  def typesConform(clazz: java.lang.Class[_], values: Seq[Any]): Boolean =
+  def typesConform(clazz: java.lang.Class[_], values: Iterable[Any]): Boolean =
     filterByConformantType(clazz, values).isEmpty
 
   /** Filters a list by the type of its elements.
@@ -87,7 +87,7 @@ object MiscUtils extends Logging {
    *          the values
    *  @return the sequence of elements with non-conforming types
    */
-  def filterByConformantType(clazz: java.lang.Class[_], values: Seq[Any]) = values.filter(x => !clazz.isAssignableFrom(x.getClass))
+  def filterByConformantType(clazz: java.lang.Class[_], values: Iterable[Any]) = values.filter(x => !clazz.isAssignableFrom(x.getClass))
 
   /** Gets the value or, if it is empty, gets default instead.
    *
diff --git a/sessl/src/main/scala/sessl/util/ScalaToJava.scala b/sessl/src/main/scala/sessl/util/ScalaToJava.scala
index 4261ed8..45fb15a 100644
--- a/sessl/src/main/scala/sessl/util/ScalaToJava.scala
+++ b/sessl/src/main/scala/sessl/util/ScalaToJava.scala
@@ -53,10 +53,9 @@ object ScalaToJava {
   def toDoubleArray(values: Iterable[Double]): Array[java.lang.Double] = values.map(_.asInstanceOf[java.lang.Double]).toArray
 
   /** Convert list to (transposed) nested array. */
-  def to2DTransposedJavaStringArray(valueLists: List[String]*): Array[Array[java.lang.String]] = {
+  def to2DTransposedJavaStringArray(valueLists: Seq[String]*): Array[Array[java.lang.String]] = {
     if (valueLists.length == 0)
       return Array.ofDim(0)
-
     val rv: Array[Array[java.lang.String]] = Array.ofDim(valueLists.head.length)
     for (i <- valueLists.head.indices)
       rv(i) = Array.ofDim(valueLists.length)
@@ -66,7 +65,7 @@ object ScalaToJava {
   }
 
   /** Convert list to nested array. */
-  def to2DJavaDoubleArray(valueLists: List[Double]*) = {
+  def to2DJavaDoubleArray(valueLists: Iterable[Double]*) = {
     val rv: Array[Array[java.lang.Double]] = Array.ofDim(valueLists.length)
     for (i <- valueLists.indices)
       rv(i) = toDoubleArray(valueLists(i))