diff --git a/source/use_case/kws_asr/src/MainLoop.cc b/source/use_case/kws_asr/src/MainLoop.cc
new file mode 100644
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+++ b/source/use_case/kws_asr/src/MainLoop.cc
@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "hal.h"                    /* Brings in platform definitions. */
+#include "InputFiles.hpp"           /* For input images. */
+#include "Labels_dscnn.hpp"         /* For DS-CNN label strings. */
+#include "Labels_wav2letter.hpp"    /* For Wav2Letter label strings. */
+#include "Classifier.hpp"           /* KWS classifier. */
+#include "AsrClassifier.hpp"        /* ASR classifier. */
+#include "DsCnnModel.hpp"           /* KWS model class for running inference. */
+#include "Wav2LetterModel.hpp"      /* ASR model class for running inference. */
+#include "UseCaseCommonUtils.hpp"   /* Utils functions. */
+#include "UseCaseHandler.hpp"       /* Handlers for different user options. */
+#include "Wav2LetterPreprocess.hpp" /* ASR pre-processing class. */
+#include "Wav2LetterPostprocess.hpp"/* ASR post-processing class. */
+
+using KwsClassifier = arm::app::Classifier;
+
+enum opcodes
+{
+    MENU_OPT_RUN_INF_NEXT = 1,       /* Run on next vector. */
+    MENU_OPT_RUN_INF_CHOSEN,         /* Run on a user provided vector index. */
+    MENU_OPT_RUN_INF_ALL,            /* Run inference on all. */
+    MENU_OPT_SHOW_MODEL_INFO,        /* Show model info. */
+    MENU_OPT_LIST_AUDIO_CLIPS        /* List the current baked audio clips. */
+};
+
+static void DisplayMenu()
+{
+    printf("\n\nUser input required\n");
+    printf("Enter option number from:\n\n");
+    printf("  %u. Classify next audio clip\n", MENU_OPT_RUN_INF_NEXT);
+    printf("  %u. Classify audio clip at chosen index\n", MENU_OPT_RUN_INF_CHOSEN);
+    printf("  %u. Run classification on all audio clips\n", MENU_OPT_RUN_INF_ALL);
+    printf("  %u. Show NN model info\n", MENU_OPT_SHOW_MODEL_INFO);
+    printf("  %u. List audio clips\n\n", MENU_OPT_LIST_AUDIO_CLIPS);
+    printf("  Choice: ");
+}
+
+/** @brief Gets the number of MFCC features for a single window. */
+static uint32_t GetNumMfccFeatures(const arm::app::Model& model);
+
+/** @brief Gets the number of MFCC feature vectors to be computed. */
+static uint32_t GetNumMfccFeatureVectors(const arm::app::Model& model);
+
+/** @brief Gets the output context length (left and right) for post-processing. */
+static uint32_t GetOutputContextLen(const arm::app::Model& model,
+                                    uint32_t inputCtxLen);
+
+/** @brief Gets the output inner length for post-processing. */
+static uint32_t GetOutputInnerLen(const arm::app::Model& model,
+                                  uint32_t outputCtxLen);
+
+void main_loop(hal_platform& platform)
+{
+    /* Model wrapper objects. */
+    arm::app::DsCnnModel kwsModel;
+    arm::app::Wav2LetterModel asrModel;
+
+    /* Load the models. */
+    if (!kwsModel.Init()) {
+        printf_err("Failed to initialise KWS model\n");
+        return;
+    }
+
+    /* Initialise the asr model using the same allocator from KWS
+     * to re-use the tensor arena. */
+    if (!asrModel.Init(kwsModel.GetAllocator())) {
+        printf_err("Failed to initalise ASR model\n");
+        return;
+    }
+
+    /* Initialise ASR pre-processing. */
+    arm::app::audio::asr::Preprocess prep(
+            GetNumMfccFeatures(asrModel),
+            arm::app::asr::g_FrameLength,
+            arm::app::asr::g_FrameStride,
+            GetNumMfccFeatureVectors(asrModel));
+
+    /* Initialise ASR post-processing. */
+    const uint32_t outputCtxLen = GetOutputContextLen(asrModel, arm::app::asr::g_ctxLen);
+    const uint32_t blankTokenIdx = 28;
+    arm::app::audio::asr::Postprocess postp(
+            outputCtxLen,
+            GetOutputInnerLen(asrModel, outputCtxLen),
+            blankTokenIdx);
+
+    /* Instantiate application context. */
+    arm::app::ApplicationContext caseContext;
+
+    caseContext.Set<hal_platform&>("platform", platform);
+    caseContext.Set<arm::app::Model&>("kwsmodel", kwsModel);
+    caseContext.Set<arm::app::Model&>("asrmodel", asrModel);
+    caseContext.Set<uint32_t>("clipIndex", 0);
+    caseContext.Set<uint32_t>("ctxLen", arm::app::asr::g_ctxLen);  /* Left and right context length (MFCC feat vectors). */
+    caseContext.Set<int>("kwsframeLength", arm::app::kws::g_FrameLength);
+    caseContext.Set<int>("kwsframeStride", arm::app::kws::g_FrameStride);
+    caseContext.Set<float>("kwsscoreThreshold", arm::app::kws::g_ScoreThreshold);  /* Normalised score threshold. */
+    caseContext.Set<uint32_t >("kwsNumMfcc", arm::app::kws::g_NumMfcc);
+    caseContext.Set<uint32_t >("kwsNumAudioWins", arm::app::kws::g_NumAudioWins);
+
+    caseContext.Set<int>("asrframeLength", arm::app::asr::g_FrameLength);
+    caseContext.Set<int>("asrframeStride", arm::app::asr::g_FrameStride);
+    caseContext.Set<float>("asrscoreThreshold", arm::app::asr::g_ScoreThreshold);  /* Normalised score threshold. */
+
+    KwsClassifier kwsClassifier;  /* Classifier wrapper object. */
+    arm::app::AsrClassifier asrClassifier;  /* Classifier wrapper object. */
+    caseContext.Set<arm::app::Classifier&>("kwsclassifier", kwsClassifier);
+    caseContext.Set<arm::app::AsrClassifier&>("asrclassifier", asrClassifier);
+
+    caseContext.Set<arm::app::audio::asr::Preprocess&>("preprocess", prep);
+    caseContext.Set<arm::app::audio::asr::Postprocess&>("postprocess", postp);
+
+    std::vector<std::string> asrLabels;
+    arm::app::asr::GetLabelsVector(asrLabels);
+    std::vector<std::string> kwsLabels;
+    arm::app::kws::GetLabelsVector(kwsLabels);
+    caseContext.Set<const std::vector <std::string>&>("asrlabels", asrLabels);
+    caseContext.Set<const std::vector <std::string>&>("kwslabels", kwsLabels);
+
+    /* Index of the kws outputs we trigger ASR on. */
+    caseContext.Set<uint32_t>("keywordindex", 2);
+
+    /* Loop. */
+    bool executionSuccessful = true;
+    constexpr bool bUseMenu = NUMBER_OF_FILES > 1 ? true : false;
+
+    /* Loop. */
+    do {
+        int menuOption = MENU_OPT_RUN_INF_NEXT;
+        if (bUseMenu) {
+            DisplayMenu();
+            menuOption = arm::app::ReadUserInputAsInt(platform);
+            printf("\n");
+        }
+        switch (menuOption) {
+            case MENU_OPT_RUN_INF_NEXT:
+                executionSuccessful = ClassifyAudioHandler(
+                        caseContext,
+                        caseContext.Get<uint32_t>("clipIndex"),
+                        false);
+                break;
+            case MENU_OPT_RUN_INF_CHOSEN: {
+                printf("    Enter the audio clip index [0, %d]: ",
+                       NUMBER_OF_FILES-1);
+                auto clipIndex = static_cast<uint32_t>(
+                        arm::app::ReadUserInputAsInt(platform));
+                executionSuccessful = ClassifyAudioHandler(caseContext,
+                                                           clipIndex,
+                                                           false);
+                break;
+            }
+            case MENU_OPT_RUN_INF_ALL:
+                executionSuccessful = ClassifyAudioHandler(
+                        caseContext,
+                        caseContext.Get<uint32_t>("clipIndex"),
+                        true);
+                break;
+            case MENU_OPT_SHOW_MODEL_INFO:
+                executionSuccessful = kwsModel.ShowModelInfoHandler();
+                executionSuccessful = asrModel.ShowModelInfoHandler();
+                break;
+            case MENU_OPT_LIST_AUDIO_CLIPS:
+                executionSuccessful = ListFilesHandler(caseContext);
+                break;
+            default:
+                printf("Incorrect choice, try again.");
+                break;
+        }
+    } while (executionSuccessful && bUseMenu);
+    info("Main loop terminated.\n");
+}
+
+static uint32_t GetNumMfccFeatures(const arm::app::Model& model)
+{
+    TfLiteTensor* inputTensor = model.GetInputTensor(0);
+    const int inputCols = inputTensor->dims->data[arm::app::Wav2LetterModel::ms_inputColsIdx];
+    if (0 != inputCols % 3) {
+        printf_err("Number of input columns is not a multiple of 3\n");
+    }
+    return std::max(inputCols/3, 0);
+}
+
+static uint32_t GetNumMfccFeatureVectors(const arm::app::Model& model)
+{
+    TfLiteTensor* inputTensor = model.GetInputTensor(0);
+    const int inputRows = inputTensor->dims->data[arm::app::Wav2LetterModel::ms_inputRowsIdx];
+    return std::max(inputRows, 0);
+}
+
+static uint32_t GetOutputContextLen(const arm::app::Model& model, const uint32_t inputCtxLen)
+{
+    const uint32_t inputRows = GetNumMfccFeatureVectors(model);
+    const uint32_t inputInnerLen = inputRows - (2 * inputCtxLen);
+    constexpr uint32_t ms_outputRowsIdx = arm::app::Wav2LetterModel::ms_outputRowsIdx;
+
+    /* Check to make sure that the input tensor supports the above context and inner lengths. */
+    if (inputRows <= 2 * inputCtxLen || inputRows <= inputInnerLen) {
+        printf_err("Input rows not compatible with ctx of %u\n",
+                   inputCtxLen);
+        return 0;
+    }
+
+    TfLiteTensor* outputTensor = model.GetOutputTensor(0);
+    const uint32_t outputRows = std::max(outputTensor->dims->data[ms_outputRowsIdx], 0);
+
+    const float tensorColRatio = static_cast<float>(inputRows)/
+                                 static_cast<float>(outputRows);
+
+    return std::round(static_cast<float>(inputCtxLen)/tensorColRatio);
+}
+
+static uint32_t GetOutputInnerLen(const arm::app::Model& model,
+                                  const uint32_t outputCtxLen)
+{
+    constexpr uint32_t ms_outputRowsIdx = arm::app::Wav2LetterModel::ms_outputRowsIdx;
+    TfLiteTensor* outputTensor = model.GetOutputTensor(0);
+    const uint32_t outputRows = std::max(outputTensor->dims->data[ms_outputRowsIdx], 0);
+    return (outputRows - (2 * outputCtxLen));
+}