diff --git a/wally/result_classes.py b/wally/result_classes.py
new file mode 100644
index 0000000..9b488b7
--- /dev/null
+++ b/wally/result_classes.py
@@ -0,0 +1,54 @@
+from typing import Union, Dict, List, Any, Tuple
+
+# Stores test result for integral value, which
+# can be expressed as a single value for given time period,
+# like IO, BW, etc.
+TimeSeriesIntegral = List[float]
+
+
+# Stores test result for value, which
+# requires distribution to be stored for any time period,
+# like latency.
+TimeSeriesHistogram = List[List[float]]
+
+
+TimeSeries = Union[TimeSeriesIntegral, TimeSeriesHistogram]
+RawTestResults = Dict[str, TimeSeries]
+
+
+class SensorInfo:
+    """Holds information from a single sensor from a single node"""
+    node_id = None  # type: str
+    source_id = None  # type: str
+    sensor_name = None  # type: str
+    begin_time = None  # type: int
+    end_time = None  # type: int
+    data = None  # type: TimeSeries
+
+    def __init__(self, node_id: str, source_id: str, sensor_name: str) -> None:
+        self.node_id = node_id
+        self.source_id = source_id
+        self.sensor_name = sensor_name
+
+
+class TestInfo:
+    """Contains done test information"""
+    name = None  # type: str
+    iteration_name = None # type: str
+    nodes = None  # type: List[str]
+    start_time = None  # type: int
+    stop_time = None  # type: int
+    params = None  # type: Dict[str, Any]
+    config = None  # type: str
+    node_ids = None # type: List[str]
+
+
+class FullTestResult:
+    test_info = None  # type: TestInfo
+
+    # TODO(koder): array.array or numpy.array?
+    # {(node_id, perf_metrics_name): values}
+    performance_data = None  # type: Dict[Tuple[str, str], TimeSeries]
+
+    # {(node_id, perf_metrics_name): values}
+    sensors_data = None  # type: Dict[Tuple[str, str, str], SensorInfo]