diff --git a/src/component/charts/container/chart-container.tsx b/src/component/charts/container/chart-container.tsx
index 94aa5f4..e1f5174 100644
--- a/src/component/charts/container/chart-container.tsx
+++ b/src/component/charts/container/chart-container.tsx
@@ -4,8 +4,10 @@ import { View } from "react-native";
 import { XAxis, YAxis } from "react-native-svg-charts";
 import { graphStyles } from "../chart-styles";
 import ChartView from "../chart-view";
+import { chartDefaults } from "../graph-config";
 import { ChartContainerProps } from "../graph-types";
-import { useGraphData } from "../use-graph-data";
+import { computeYAxisConfig, useGraphData } from "../use-graph-data";
+computeYAxisConfig;
 
 // TODO: #43 #31 separate PR will update useGraphData to take into account useCommonScale
 // eslint-disable-next-line no-unused-vars, @typescript-eslint/no-unused-vars
@@ -19,62 +21,49 @@ const ChartContainer: React.FC<ChartContainerProps> = ({
 	if (!data || typeof data !== "object") {
 		return null;
 	} // TODO:#38
+	const yAxisProps = computeYAxisConfig(data, props.yAxisProps || {});
+
 	const {
 		xValues,
 		yData,
 		yAxisLeftLabels,
 		yAxisRightLabels,
-		defaultProps: {
-			height,
-			contentInset,
-			min,
-			numberOfTicks,
-			lineStrokeWidth,
-			spacingInner,
-			spacingOuter,
-			barColors,
-			yAxisProps: {
-				maxLeftYAxisValue,
-				maxRightYAxisValue,
-				formatLeftYAxisLabel,
-				formatRightYAxisLabel,
-			},
-		},
 		// Proper error/loading handling from useQueryHandler can work with this rule #38
 		// eslint-disable-next-line react-hooks/rules-of-hooks
-	} = useGraphData(data, {
+	} = useGraphData(data, yAxisProps, {
 		includeColors: ChartComponent.chartType === "bar" ? false : true,
 		...props,
 	});
 
 	// TODO: #31 This could be done by the hook since it already handles spreading props.
-	// Depending on if we want a context provider for Charts, that could be another way to handle it
+	// Depiending on if we want a context pr}}ovider for Charts, that could be another way to handle it
 	const chartComponentProps = {
 		yData,
 		xValues,
-		lineStrokeWidth,
-		min,
-		contentInset,
-		numberOfTicks,
-		spacingInner,
-		spacingOuter,
-		barColors,
+		lineStrokeWidth: chartDefaults.lineStrokeWidth,
+		min: chartDefaults.min,
+		contentInset: chartDefaults.contentInset,
+		numberOfTicks: chartDefaults.numberOfTicks,
+		spacingInner: chartDefaults.spacingInner,
+		spacingOuter: chartDefaults.spacingOuter,
+		barColors: chartDefaults.barColors,
 	};
+
 	return (
 		<ChartView>
 			<View
-				style={[graphStyles.rowContainer, { height: height }]}
+				style={[graphStyles.rowContainer, { height: chartDefaults.height }]}
 				testID={`chart-container-${testID}`}
 			>
 				<YAxis
 					data={yAxisLeftLabels.values}
-					contentInset={contentInset}
+					contentInset={chartDefaults.contentInset}
 					svg={graphStyles.yAxisFontStyle}
 					style={graphStyles.yAxisLeftPadding}
-					min={min}
-					max={maxLeftYAxisValue}
-					numberOfTicks={numberOfTicks}
-					formatLabel={formatLeftYAxisLabel}
+					min={chartDefaults.min}
+					max={yAxisProps.maxLeftYAxisValue}
+					numberOfTicks={chartDefaults.numberOfTicks}
+					formatLabel={yAxisProps.formatLeftYAxisLabel}
 				/>
 				<View style={graphStyles.flex}>
 					<ChartComponent {...chartComponentProps} />
@@ -87,23 +76,23 @@ const ChartContainer: React.FC<ChartContainerProps> = ({
 							scale: scale.scaleBand,
 						})}
 						{...(ChartComponent.chartType === "line" && {
-							numberOfTicks: numberOfTicks,
+							numberOfTicks: chartDefaults.numberOfTicks,
 							contentInset: graphStyles.horizontalInset,
 						})}
 					/>
 				</View>
 				<YAxis
 					data={yAxisRightLabels?.values ?? yAxisLeftLabels.values}
-					contentInset={contentInset}
+					contentInset={chartDefaults.contentInset}
 					svg={graphStyles.yAxisFontStyle}
 					style={[
 						graphStyles.yAxisRightPadding,
 						{ height: useCommonScale ? 0 : "auto" },
 					]}
-					min={min}
-					max={maxRightYAxisValue}
-					numberOfTicks={numberOfTicks}
-					formatLabel={formatRightYAxisLabel}
+					min={chartDefaults.min}
+					max={yAxisProps.maxRightYAxisValue}
+					numberOfTicks={chartDefaults.numberOfTicks}
+					formatLabel={yAxisProps.formatRightYAxisLabel}
 				/>
 			</View>
 		</ChartView>
diff --git a/src/component/charts/graph-types.ts b/src/component/charts/graph-types.ts
index ce7ec65..80b7571 100644
--- a/src/component/charts/graph-types.ts
+++ b/src/component/charts/graph-types.ts
@@ -15,7 +15,7 @@ export interface YAxisData {
 
 export type XValue = string | number;
 
-export interface GraphData {
+export interface XYValues {
 	xValues: Array<XValue>;
 	yValues: Array<YAxisData>;
 }
@@ -32,8 +32,15 @@ export interface YAxisProps {
 	// eslint-disable-next-line no-unused-vars
 	formatLeftYAxisLabel?: (value: string) => string;
 }
+
+export interface ScaledAndStyledYDataItem {
+	data: { value: number }[];
+	svg: { fill: string; stroke: string };
+}
+export type ScaledAndStyledYData = ScaledAndStyledYDataItem[];
+
 export interface GraphProps {
-	data: GraphData;
+	data: XYValues;
 	includeColors?: boolean;
 	height?: number;
 	spacingInner?: number;
@@ -90,7 +97,7 @@ type ChartComponentWithStatic = React.ComponentType<CommonProps> & {
  */
 export interface ChartContainerProps extends CommonProps {
 	ChartComponent: ChartComponentWithStatic;
-	data: GraphData;
+	data: XYValues;
 }
 
 /**
diff --git a/src/component/charts/graph-utils.tsx b/src/component/charts/graph-utils.tsx
index 9a84d57..411ea99 100644
--- a/src/component/charts/graph-utils.tsx
+++ b/src/component/charts/graph-utils.tsx
@@ -1,52 +1,115 @@
-import { GraphData } from "./graph-types";
+import {
+	ScaledAndStyledYData,
+	XValue,
+	XYValues,
+	YAxisData,
+	YAxisProps,
+} from "./graph-types";
 
-export const convertToGraphData = (
-	graphData: GraphData,
-	options: {
-		selectedLeftYAxisLabel?: string;
-		selectedRightYAxisLabel?: string;
-		maxRightYAxisValue: number;
-		maxLeftYAxisValue: number;
-		includeColors: boolean;
-		barColors: Array<string>;
-	},
+interface PrepareGraphDataReturn {
+	yData: ScaledAndStyledYData;
+	yAxisLeftLabels: YAxisData;
+	yAxisRightLabels: YAxisData;
+	xValues: XValue[];
+}
+
+export const prepareGraphData = (
+	xyData: XYValues,
+	yAxisProps: YAxisProps,
+	includeColors: boolean,
+	barColors: string[],
+): PrepareGraphDataReturn => {
+	const { leftAxisIndex, rightAxisIndex } = findAxisIndices(
+		xyData.yValues,
+		yAxisProps.selectedLeftYAxisLabel,
+		yAxisProps.selectedRightYAxisLabel,
+	);
+
+	const yData = createYData(
+		xyData.yValues,
+		rightAxisIndex,
+		yAxisProps.maxRightYAxisValue,
+		yAxisProps.maxLeftYAxisValue,
+		includeColors,
+		barColors,
+	);
+
+	// Ensure yAxisLeftLabels and yAxisRightLabels are correctly defined
+	const yAxisLeftLabels =
+		leftAxisIndex >= 0
+			? xyData.yValues[leftAxisIndex]
+			: { key: "", values: [] };
+	const yAxisRightLabels =
+		rightAxisIndex >= 0
+			? xyData.yValues[rightAxisIndex]
+			: { key: "", values: [] };
+
+	return {
+		yData,
+		yAxisLeftLabels,
+		yAxisRightLabels,
+		xValues: xyData.xValues,
+	};
+};
+
+const scaleValues = (
+	yAxis,
+	index,
+	rightAxisIndex,
+	maxRightYAxisValue,
+	maxLeftYAxisValue,
 ) => {
-	const xValues = graphData.xValues;
-	const leftAxisIndex = graphData.yValues.findIndex(
-		(y) => y.key === options.selectedLeftYAxisLabel,
-	);
-	const rightAxisIndex = graphData.yValues.findIndex(
-		(y) => y.key === options.selectedRightYAxisLabel,
-	);
+	const maxValue =
+		index === rightAxisIndex ? maxRightYAxisValue : maxLeftYAxisValue;
+	return yAxis.values.map((value) => (value / maxValue) * 100);
+};
 
-	// scale data points according to max value
-	const yData = graphData.yValues.map((yAxis, index) => {
-		const maxValue =
-			index === rightAxisIndex
-				? options.maxRightYAxisValue
-				: options.maxLeftYAxisValue;
+const getStrokeColor = (index, includeColors, barColors) =>
+	includeColors ? barColors[index % barColors.length] : "transparent";
 
-		// scale values as a percentage of the max value
-		const scaledValues = yAxis.values.map((value) => (value / maxValue) * 100);
-
-		const strokeColor =
-			options.includeColors && options.barColors
-				? options.barColors[index % options.barColors.length]
-				: "transparent";
-
-		const mappedData = scaledValues.map((scaledValue) => ({
-			value: scaledValue,
-		}));
+/**
+ * Finds the indices of the datasets in `yValues` that match the specified left and right Y-axis labels.
+ *
+ * Iterates through the `yValues` , searching for objects whose `key` matches
+ * `selectedLeftYAxisLabel` and `selectedRightYAxisLabel`. It's used to identify which datasets
+ * should be plotted against the left and right Y-axes in a graph. If a match is not found for a label,
+ * the corresponding axis index is set to `-1`.
+ */
+const findAxisIndices = (
+	yValues: Array<{ key: string; values: Array<number> }>,
+	selectedLeftYAxisLabel?: string,
+	selectedRightYAxisLabel?: string,
+): { leftAxisIndex: number; rightAxisIndex: number } => ({
+	leftAxisIndex: yValues.findIndex((y) => y.key === selectedLeftYAxisLabel),
+	rightAxisIndex: yValues.findIndex((y) => y.key === selectedRightYAxisLabel),
+});
 
+/**
+ * Transforms Y-axis data by scaling values and applying stroke colors for visualization.
+ *
+ * This function takes an array of Y-axis data objects, each with a key and an array of numeric values.
+ * It scales these values relative to specified maximum values for the left and right Y-axes and
+ * applies coloring based on the includeColors flag and the provided barColors array.
+ */
+const createYData = (
+	yValues: YAxisData[],
+	rightAxisIndex: number,
+	maxRightYAxisValue: number,
+	maxLeftYAxisValue: number,
+	includeColors: boolean,
+	barColors: string[],
+): ScaledAndStyledYData =>
+	yValues.map((yAxis, index) => {
+		const scaledValues = scaleValues(
+			yAxis,
+			index,
+			rightAxisIndex,
+			maxRightYAxisValue,
+			maxLeftYAxisValue,
+		);
+		const strokeColor = getStrokeColor(index, includeColors, barColors);
 		return {
-			data: mappedData,
-			svg: { fill: "transparent", stroke: strokeColor }, // Apply the stroke color here
+			data: scaledValues.map((value) => ({ value })),
+			svg: { fill: "transparent", stroke: strokeColor },
 		};
 	});
-	const yAxisLeftLabels =
-		leftAxisIndex !== -1 ? graphData.yValues[leftAxisIndex] : null;
-	const yAxisRightLabels =
-		rightAxisIndex !== -1 ? graphData.yValues[rightAxisIndex] : undefined;
-
-	return { yData, yAxisLeftLabels, yAxisRightLabels, xValues };
-};
diff --git a/src/component/charts/use-graph-data.ts b/src/component/charts/use-graph-data.ts
index 1be47db..cdb5e25 100644
--- a/src/component/charts/use-graph-data.ts
+++ b/src/component/charts/use-graph-data.ts
@@ -1,70 +1,89 @@
 import { useMemo } from "react";
 
 import { chartDefaults } from "./graph-config";
-import { GraphData, GraphProps, XValue, YAxisData } from "./graph-types";
-import { convertToGraphData } from "./graph-utils";
+import {
+	GraphProps,
+	ScaledAndStyledYData,
+	XValue,
+	XYValues,
+	YAxisData,
+	YAxisProps,
+} from "./graph-types";
+import { prepareGraphData } from "./graph-utils";
 
-interface useGraphDataInterface {
+export interface UseGraphDataReturn {
 	xValues: Array<XValue>;
-	yData: {
-		data: {
-			value: number;
-		}[];
-		svg: {
-			fill: string;
-		};
-	}[];
+	yData: ScaledAndStyledYData;
 	yAxisLeftLabels: YAxisData;
 	yAxisRightLabels: YAxisData;
-	defaultProps: Partial<GraphProps>;
 }
 
-// this version assumes string values for X, this isn't necessarily the case
-// convertToGraphData is specifically tailored to bar/group bar graphs
-// ultimately this component could be used by any x & y axis graph types (line/bar/scatter)
 export const useGraphData = (
-	graphData: GraphData,
+	xyData: XYValues,
+	yAxisProps: YAxisProps,
 	props: Partial<GraphProps>,
-): useGraphDataInterface => {
-	const { yAxisProps = {}, ...otherProps } = props;
-	const defaultProps = {
-		...chartDefaults,
-		...otherProps,
-		// assign default values for yAxisProps + spread to override with values coming from props
-		yAxisProps: {
-			maxLeftYAxisValue: Math.max(...(graphData.yValues[0]?.values ?? [0])),
-			maxRightYAxisValue:
-				graphData.yValues.length > 1
-					? Math.max(...graphData.yValues[1]?.values)
-					: undefined,
-			formatRightYAxisLabel: yAxisProps.formatRightYAxisLabel,
-			formatLeftYAxisLabel: yAxisProps.formatLeftYAxisLabel,
-			selectedLeftYAxisLabel: graphData.yValues[0]?.key,
-			selectedRightYAxisLabel: graphData.yValues[1]?.key,
-			...yAxisProps,
-		},
-	};
-
-	const { yData, yAxisLeftLabels, yAxisRightLabels, xValues } = useMemo(
-		() =>
-			convertToGraphData(graphData, {
-				...defaultProps.yAxisProps,
-				includeColors: defaultProps.includeColors,
-				barColors: defaultProps.barColors,
-			}),
-		[
-			graphData,
-			defaultProps.yAxisProps,
-			defaultProps.includeColors,
-			defaultProps.barColors,
-		],
-	);
-
+): UseGraphDataReturn => {
+	const { yData, yAxisLeftLabels, yAxisRightLabels, xValues } = useMemo(() => {
+		return prepareGraphData(
+			xyData,
+			yAxisProps,
+			chartDefaults.includeColors,
+			chartDefaults.barColors,
+		);
+	}, [xyData]);
 	return {
 		xValues,
 		yData,
 		yAxisLeftLabels,
 		yAxisRightLabels,
-		defaultProps,
 	};
 };
+
+function computeAxisMaxValues(xyData: XYValues): {
+	maxLeft: number;
+	maxRight: number | undefined;
+} {
+	const maxLeft = Math.max(...(xyData.yValues[0]?.values ?? [0]));
+	const maxRight =
+		xyData.yValues.length > 1
+			? Math.max(...(xyData.yValues[1]?.values ?? []))
+			: undefined;
+	return { maxLeft, maxRight };
+}
+
+function selectAxisLabels(xyData: XYValues): {
+	leftLabel: string;
+	rightLabel: string | undefined;
+} {
+	const leftLabel = xyData.yValues[0]?.key;
+	const rightLabel =
+		xyData.yValues.length > 1 ? xyData.yValues[1]?.key : undefined;
+	return { leftLabel, rightLabel };
+}
+
+function applyDefaultYAxisProps(
+	defaultProps: Partial<GraphProps["yAxisProps"]>,
+): Partial<YAxisProps> {
+	return {
+		formatRightYAxisLabel: defaultProps.formatRightYAxisLabel,
+		formatLeftYAxisLabel: defaultProps.formatLeftYAxisLabel,
+	};
+}
+
+export function computeYAxisConfig(
+	xyData: XYValues,
+	yAxisPropsDefault: Partial<GraphProps["yAxisProps"]>,
+): YAxisProps {
+	const { maxLeft, maxRight } = computeAxisMaxValues(xyData);
+	const { leftLabel, rightLabel } = selectAxisLabels(xyData);
+	const defaultYAxisProps = applyDefaultYAxisProps(yAxisPropsDefault);
+
+	return {
+		maxLeftYAxisValue: maxLeft,
+		maxRightYAxisValue: maxRight,
+		selectedLeftYAxisLabel: leftLabel,
+		selectedRightYAxisLabel: rightLabel,
+		...defaultYAxisProps,
+		...yAxisPropsDefault,
+	};
+}
diff --git a/src/screens/session.tsx b/src/screens/session.tsx
index ef1d982..2166798 100644
--- a/src/screens/session.tsx
+++ b/src/screens/session.tsx
@@ -1,15 +1,21 @@
 import React from "react";
 import { StyleSheet, View } from "react-native";
-import { line_chart_two_y_data } from "../../test/mock/charts/mock-data";
+import {
+	graph_data_two_measures,
+	line_chart_two_y_data,
+} from "../../test/mock/charts/mock-data";
+import BarGraph from "../component/charts/bar-graph/bar-graph";
 import ChartContainer from "../component/charts/container/chart-container";
 import LineGraph from "../component/charts/line-graph/line-graph";
 
-// Session Mock - can be used for session summary screen using a query handler component
-// BarGraph component using mocked data currently
 export default function SessionScreen() {
 	return (
 		<View style={StyleSheet.absoluteFill}>
 			<ChartContainer data={line_chart_two_y_data} ChartComponent={LineGraph} />
+			<ChartContainer
+				data={graph_data_two_measures}
+				ChartComponent={BarGraph}
+			/>
 		</View>
 	);
 }
diff --git a/test/component/use-graph-data.test.tsx b/test/component/use-graph-data.test.tsx
index 30b4628..b2defbd 100644
--- a/test/component/use-graph-data.test.tsx
+++ b/test/component/use-graph-data.test.tsx
@@ -1,11 +1,14 @@
 import { renderHook } from "@testing-library/react-native";
-import { GraphData, GraphProps } from "../../src/component/charts/graph-types";
-import { useGraphData } from "../../src/component/charts/use-graph-data";
+import { GraphProps, XYValues } from "../../src/component/charts/graph-types";
+import {
+	computeYAxisConfig,
+	useGraphData,
+} from "../../src/component/charts/use-graph-data";
 
 describe("useGraphData", () => {
 	it("should return correctly processed data from convertToGraphData", () => {
 		// mock values
-		const mockGraphData: GraphData = {
+		const mockGraphData: XYValues = {
 			xValues: ["full hit", "3/4 ball ball", "1/2 ball"],
 			yValues: [
 				{ key: "left", values: [10, 20, 30] },
@@ -23,8 +26,14 @@ describe("useGraphData", () => {
 				formatLeftYAxisLabel: (value) => `${value}%`,
 			},
 		};
+		const yAxisProps = computeYAxisConfig(
+			mockGraphData,
+			mockProps.yAxisProps || {},
+		);
 
-		const { result } = renderHook(() => useGraphData(mockGraphData, mockProps));
+		const { result } = renderHook(() =>
+			useGraphData(mockGraphData, yAxisProps, mockProps),
+		);
 		// values expected
 		const expectedYData = [
 			{
@@ -55,12 +64,5 @@ describe("useGraphData", () => {
 		});
 		expect(result.current.yAxisLeftLabels).toEqual(expectedLeftLabels);
 		expect(result.current.yAxisRightLabels).toEqual(expectedRightLabels);
-		expect(
-			result.current.defaultProps.yAxisProps.selectedLeftYAxisLabel,
-		).toEqual("left");
-		expect(
-			result.current.defaultProps.yAxisProps.selectedRightYAxisLabel,
-		).toEqual("right");
-		expect(result.current.defaultProps).toBeDefined();
 	});
 });