diff --git a/.gitignore b/.gitignore
index 2b0cdb5..b66d3d3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 exec/*
 !exec/executable.txt
-inputs/*.log.txt
-inputs/*.out.txt
+*.log.txt
+*.out.txt
 mips_cpu_harvard.vcd
\ No newline at end of file
diff --git a/inputs/addiu.ref.txt b/inputs/addiu/addiu-1.ref.txt
similarity index 100%
rename from inputs/addiu.ref.txt
rename to inputs/addiu/addiu-1.ref.txt
diff --git a/inputs/addiu.txt b/inputs/addiu/addiu-1.txt
similarity index 100%
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rename to inputs/addiu/addiu-1.txt
diff --git a/inputs/addu.ref.txt b/inputs/addu/addu-1.ref.txt
similarity index 100%
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diff --git a/inputs/addu.txt b/inputs/addu/addu-1.txt
similarity index 100%
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diff --git a/inputs/and.ref.txt b/inputs/and/and-1.ref.txt
similarity index 100%
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diff --git a/inputs/and.txt b/inputs/and/and-1.txt
similarity index 100%
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diff --git a/inputs/andi.ref.txt b/inputs/andi/andi-1.ref.txt
similarity index 100%
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diff --git a/inputs/andi.txt b/inputs/andi/andi-1.txt
similarity index 100%
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diff --git a/inputs/beq.ref.txt b/inputs/beq/beq-1.ref.txt
similarity index 100%
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diff --git a/inputs/bgez.ref.txt b/inputs/bgez/bgez-1.ref.txt
similarity index 100%
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similarity index 100%
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similarity index 100%
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diff --git a/inputs/bgtz.ref.txt b/inputs/bgtz/bgtz-1.ref.txt
similarity index 100%
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similarity index 100%
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diff --git a/inputs/blez.ref.txt b/inputs/blez/blez-1.ref.txt
similarity index 100%
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similarity index 100%
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diff --git a/inputs/bltz.ref.txt b/inputs/bltz/bltz-1.ref.txt
similarity index 100%
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diff --git a/inputs/bltz.txt b/inputs/bltz/bltz-1.txt
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diff --git a/inputs/bltzal.ref.txt b/inputs/bltzal/bltzal-1.ref.txt
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similarity index 100%
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diff --git a/inputs/bne.ref.txt b/inputs/bne/bne-1.ref.txt
similarity index 100%
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diff --git a/inputs/div.ref.txt b/inputs/div/div-1.ref.txt
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diff --git a/inputs/div.txt b/inputs/div/div-1.txt
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diff --git a/inputs/divu.txt b/inputs/divu/divu-1.txt
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diff --git a/inputs/j.ref.txt b/inputs/j/j-1.ref.txt
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diff --git a/inputs/jal.ref.txt b/inputs/jal/jal-1.ref.txt
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diff --git a/inputs/jalr.ref.txt b/inputs/jalr/jalr-1.ref.txt
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diff --git a/inputs/lb.data.txt b/inputs/lb/lb-1.data.txt
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diff --git a/inputs/lbu.data.txt b/inputs/lbu/lbu-1.data.txt
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diff --git a/inputs/lh.data.txt b/inputs/lh/lh-1.data.txt
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diff --git a/inputs/lh.ref.txt b/inputs/lh/lh-1.ref.txt
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diff --git a/inputs/lh.txt b/inputs/lh/lh-1.txt
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diff --git a/inputs/lhu.data.txt b/inputs/lhu/lhu-1.data.txt
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diff --git a/inputs/lhu.txt b/inputs/lhu/lhu-1.txt
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diff --git a/inputs/lui.ref.txt b/inputs/lui/lui-1.ref.txt
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diff --git a/inputs/lui.txt b/inputs/lui/lui-1.txt
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diff --git a/inputs/lw.data.txt b/inputs/lw/lw-1.data.txt
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diff --git a/inputs/lw.txt b/inputs/lw/lw-1.txt
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diff --git a/inputs/lwl.data.txt b/inputs/lwl/lwl-1.data.txt
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diff --git a/inputs/lwl.txt b/inputs/lwl/lwl-1.txt
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diff --git a/inputs/lwr.data.txt b/inputs/lwr/lwr-1.data.txt
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diff --git a/inputs/lwr.ref.txt b/inputs/lwr/lwr-1.ref.txt
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diff --git a/inputs/mfhi.ref.txt b/inputs/mfhi/mfhi-1.ref.txt
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diff --git a/inputs/mfhi.txt b/inputs/mfhi/mfhi-1.txt
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diff --git a/inputs/mflo.ref.txt b/inputs/mflo/mflo-1.ref.txt
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diff --git a/inputs/mflo.txt b/inputs/mflo/mflo-1.txt
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diff --git a/inputs/mthi.ref.txt b/inputs/mthi/mthi-1.ref.txt
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diff --git a/inputs/mthi.txt b/inputs/mthi/mthi-1.txt
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diff --git a/inputs/mtlo.txt b/inputs/mtlo/mtlo-1.txt
similarity index 100%
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diff --git a/inputs/mult.ref.txt b/inputs/mult/mult-1.ref.txt
similarity index 100%
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diff --git a/inputs/mult.txt b/inputs/mult/mult-1.txt
similarity index 100%
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diff --git a/inputs/multcurrent.txt b/inputs/multcurrent/multcurrent-1.txt
similarity index 100%
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diff --git a/inputs/multu.ref.txt b/inputs/multu/multu-1.ref.txt
similarity index 100%
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diff --git a/inputs/multu.txt b/inputs/multu/multu-1.txt
similarity index 100%
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diff --git a/inputs/multucurrent.txt b/inputs/multucurrent/multucurrent-1.txt
similarity index 100%
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diff --git a/inputs/or.ref.txt b/inputs/or/or-1.ref.txt
similarity index 100%
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diff --git a/inputs/or.txt b/inputs/or/or-1.txt
similarity index 100%
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diff --git a/inputs/ori.ref.txt b/inputs/ori/ori-1.ref.txt
similarity index 100%
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diff --git a/inputs/ori.txt b/inputs/ori/ori-1.txt
similarity index 100%
rename from inputs/ori.txt
rename to inputs/ori/ori-1.txt
diff --git a/inputs/sb.txt b/inputs/sb/sb-1.txt
similarity index 100%
rename from inputs/sb.txt
rename to inputs/sb/sb-1.txt
diff --git a/inputs/sh.txt b/inputs/sh/sh-1.txt
similarity index 100%
rename from inputs/sh.txt
rename to inputs/sh/sh-1.txt
diff --git a/inputs/sll.ref.txt b/inputs/sll/sll-1.ref.txt
similarity index 100%
rename from inputs/sll.ref.txt
rename to inputs/sll/sll-1.ref.txt
diff --git a/inputs/sll.txt b/inputs/sll/sll-1.txt
similarity index 100%
rename from inputs/sll.txt
rename to inputs/sll/sll-1.txt
diff --git a/inputs/sllv.ref.txt b/inputs/sllv/sllv-1.ref.txt
similarity index 100%
rename from inputs/sllv.ref.txt
rename to inputs/sllv/sllv-1.ref.txt
diff --git a/inputs/sllv.txt b/inputs/sllv/sllv-1.txt
similarity index 100%
rename from inputs/sllv.txt
rename to inputs/sllv/sllv-1.txt
diff --git a/inputs/slt.ref.txt b/inputs/slt.ref.txt
deleted file mode 100644
index 56a6051..0000000
--- a/inputs/slt.ref.txt
+++ /dev/null
@@ -1 +0,0 @@
-1
\ No newline at end of file
diff --git a/inputs/bqtz.ref.txt b/inputs/slt/slt-1.ref.txt
similarity index 100%
rename from inputs/bqtz.ref.txt
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diff --git a/inputs/slt.txt b/inputs/slt/slt-1.txt
similarity index 100%
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diff --git a/inputs/slti.ref.txt b/inputs/slti/slti-1.ref.txt
similarity index 100%
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diff --git a/inputs/slti.txt b/inputs/slti/slti-1.txt
similarity index 100%
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diff --git a/inputs/sltiu.ref.txt b/inputs/sltiu/sltiu-1.ref.txt
similarity index 100%
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diff --git a/inputs/sltiu.txt b/inputs/sltiu/sltiu-1.txt
similarity index 100%
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diff --git a/inputs/sltu.ref.txt b/inputs/sltu/sltu-1.ref.txt
similarity index 100%
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diff --git a/inputs/sltu.txt b/inputs/sltu/sltu-1.txt
similarity index 100%
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diff --git a/inputs/sra.ref.txt b/inputs/sra/sra-1.ref.txt
similarity index 100%
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diff --git a/inputs/sra.txt b/inputs/sra/sra-1.txt
similarity index 100%
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diff --git a/inputs/srav.ref.txt b/inputs/srav/srav-1.ref.txt
similarity index 100%
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diff --git a/inputs/srav.txt b/inputs/srav/srav-1.txt
similarity index 100%
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diff --git a/inputs/srl.ref.txt b/inputs/srl/srl-1.ref.txt
similarity index 100%
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diff --git a/inputs/srl.txt b/inputs/srl/srl-1.txt
similarity index 100%
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diff --git a/inputs/srlv.ref.txt b/inputs/srlv/srlv-1.ref.txt
similarity index 100%
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diff --git a/inputs/srlv.txt b/inputs/srlv/srlv-1.txt
similarity index 100%
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diff --git a/inputs/subu.ref.txt b/inputs/subu/subu-1.ref.txt
similarity index 100%
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diff --git a/inputs/subu.txt b/inputs/subu/subu-1.txt
similarity index 100%
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diff --git a/inputs/sw.ref.txt b/inputs/sw/sw-1.ref.txt
similarity index 100%
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rename to inputs/sw/sw-1.ref.txt
diff --git a/inputs/sw.txt b/inputs/sw/sw-1.txt
similarity index 100%
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rename to inputs/sw/sw-1.txt
diff --git a/inputs/xor.ref.txt b/inputs/xor/xor-1.ref.txt
similarity index 100%
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rename to inputs/xor/xor-1.ref.txt
diff --git a/inputs/xor.txt b/inputs/xor/xor-1.txt
similarity index 100%
rename from inputs/xor.txt
rename to inputs/xor/xor-1.txt
diff --git a/inputs/xori.ref.txt b/inputs/xori/xori-1.ref.txt
similarity index 100%
rename from inputs/xori.ref.txt
rename to inputs/xori/xori-1.ref.txt
diff --git a/inputs/xori.txt b/inputs/xori/xori-1.txt
similarity index 100%
rename from inputs/xori.txt
rename to inputs/xori/xori-1.txt
diff --git a/inputs/reference/ibrahimreference.txt b/reference/ibrahimreference.txt
similarity index 100%
rename from inputs/reference/ibrahimreference.txt
rename to reference/ibrahimreference.txt
diff --git a/inputs/reference/reference.txt b/reference/reference.txt
similarity index 100%
rename from inputs/reference/reference.txt
rename to reference/reference.txt
diff --git a/test/test_mips_cpu_harvard.sh b/test/test_mips_cpu_harvard.sh
index 0b094b4..cddad0a 100755
--- a/test/test_mips_cpu_harvard.sh
+++ b/test/test_mips_cpu_harvard.sh
@@ -1,7 +1,6 @@
 #!/bin/bash
 
-# 1. Source File & Source Directory Parsing
-SRC_DIR=${1?Error: no source directory given in argument};      # e.g. rtl
+SRC_DIR=${1?Error: no source directory given in argument};
 SRC=$(ls ${SRC_DIR} | grep -E "harvard|memory|alu|regfile|pc|control");
 SRC_TEMP="";
 for src in ${SRC}
@@ -11,55 +10,51 @@ done
 SRC=${SRC_TEMP}
 
 
-# 2. Instruction Argument
-INSTR=${2:-"No instruction specified: running all testcases"};  # e.g. addiu
+INSTR=${2:-"No instruction specified: running all testcases"};
 
-
-# 3. Start Testing
-# 3-1. Running ALL testcases when instruction not specified.
 if [[ ${INSTR} == "No instruction specified: running all testcases" ]];
 then
-    TESTCASES=$(find ./inputs ! -name '*ref*'  ! -name '*log*' ! -name '*out*' ! -name '*inputs*' ! -name '*data*' | sed 's#.*/##');
-    #echo ${TESTCASES}
-    for TESTCASE in ${TESTCASES}
+    for DIR in inputs/*/
     do
-        # Run Each Testcase File
-        #echo ${TESTCASE};
-        TESTCASE="${TESTCASE%%.*}";
-        
-iverilog -Wall -g2012 \
-    -s mips_cpu_harvard_tb \
-    -P mips_cpu_harvard_tb.INSTR_INIT_FILE=\"inputs/${TESTCASE}.txt\" \
-    -P mips_cpu_harvard_tb.DATA_INIT_FILE=\"inputs/${TESTCASE}.data.txt\" \
-    -o exec/mips_cpu_harvard_tb_${TESTCASE} testbench/mips_cpu_harvard_tb.v \
-    ${SRC} 2> /dev/null
-./exec/mips_cpu_harvard_tb_${TESTCASE} &> ./inputs/${TESTCASE}.log.txt;             # log file for debugging (contains $display)
-echo "$(tail -1 ./inputs/${TESTCASE}.log.txt)" > ./inputs/${TESTCASE}.out.txt;      # register v0 output to compare with reference
-if diff -w ./inputs/${TESTCASE}.out.txt ./inputs/${TESTCASE}.ref.txt &> /dev/null   # compare
-then 
-    echo ${TESTCASE} ${TESTCASE} "Pass";
-else 
-    printf '%s %s %s%d %s%d%s\n' "${TESTCASE}" "${TESTCASE}" "Fail Output=" "$(tail -1 ./inputs/${TESTCASE}.out.txt)" "Ref=" "$(tail -1 ./inputs/${TESTCASE}.ref.txt)" 2> /dev/null;
-fi
+        DIR=$(basename ${DIR});
+        LOOP=$(find inputs/${DIR}/* ! -name '*ref*' ! -name '*log*' ! -name '*data*' ! -name '*out*');
+        for TESTCASE in ${LOOP}
+        do
+            TESTCASE=$([[ ${TESTCASE} =~ /([^./]+)\. ]] && echo "${BASH_REMATCH[1]}");
+            iverilog -Wall -g2012 \
+                -s mips_cpu_harvard_tb \
+                -P mips_cpu_harvard_tb.INSTR_INIT_FILE=\"inputs/${DIR}/${TESTCASE}.txt\" \
+                -P mips_cpu_harvard_tb.DATA_INIT_FILE=\"inputs/${DIR}/${TESTCASE}.data.txt\" \
+                -o exec/mips_cpu_harvard_tb_${TESTCASE} testbench/mips_cpu_harvard_tb.v \
+                ${SRC} 2> /dev/null
+            ./exec/mips_cpu_harvard_tb_${TESTCASE} &> ./inputs/${DIR}/${TESTCASE}.log.txt;             # log file for debugging (contains $display)
+            echo "$(tail -1 ./inputs/${DIR}/${TESTCASE}.log.txt)" > ./inputs/${DIR}/${TESTCASE}.out.txt;      # register v0 output to compare with reference
+            if diff -w ./inputs/${DIR}/${TESTCASE}.out.txt ./inputs/${DIR}/${TESTCASE}.ref.txt &> /dev/null   # compare
+            then 
+                echo ${TESTCASE} ${DIR} "Pass";
+            else 
+                printf '%s %s %s%d %s%d%s\n' "${TESTCASE}" "${DIR}" "Fail Output=" "$(tail -1 ./inputs/${DIR}/${TESTCASE}.out.txt)" "Ref=" "$(tail -1 ./inputs/${DIR}/${TESTCASE}.ref.txt)" 2> /dev/null;
+            fi
+        done
     done
-
-# 3-2 Running SINGLE testcase of specified instruction
 else
-
-iverilog -Wall -g2012 \
-    -s mips_cpu_harvard_tb \
-    -P mips_cpu_harvard_tb.INSTR_INIT_FILE=\"inputs/${INSTR}.txt\" \
-    -P mips_cpu_harvard_tb.DATA_INIT_FILE=\"inputs/${INSTR}.data.txt\" \
-    -o exec/mips_cpu_harvard_tb_${INSTR} testbench/mips_cpu_harvard_tb.v \
-    ${SRC} 2> /dev/null
-
-./exec/mips_cpu_harvard_tb_${INSTR} &> ./inputs/${INSTR}.log.txt;                   # log file for debugging (contains $display)
-echo "$(tail -1 ./inputs/${INSTR}.log.txt)" > ./inputs/${INSTR}.out.txt;            # register v0 output to compare with reference
-if diff -w ./inputs/${INSTR}.out.txt ./inputs/${INSTR}.ref.txt &> /dev/null         # compare
-then 
-    echo ${INSTR} ${INSTR} "Pass";
-else 
-    printf '%s %s %s%d %s%d%s\n' "${INSTR}" "${INSTR}" "Fail Output=" "$(tail -1 ./inputs/${INSTR}.out.txt)" "Ref=" "$(tail -1 ./inputs/${INSTR}.ref.txt)" 2> /dev/null;
-fi
-
-fi
+    LOOP=$(find inputs/${INSTR}/* ! -name '*ref*' ! -name '*log*' ! -name '*data*' ! -name '*out*');
+    for TESTCASE in ${LOOP}
+    do
+        TESTCASE=$([[ ${TESTCASE} =~ /([^./]+)\. ]] && echo "${BASH_REMATCH[1]}");
+        iverilog -Wall -g2012 \
+        -s mips_cpu_harvard_tb \
+        -P mips_cpu_harvard_tb.INSTR_INIT_FILE=\"inputs/${INSTR}/${TESTCASE}.txt\" \
+        -P mips_cpu_harvard_tb.DATA_INIT_FILE=\"inputs/${INSTR}/${TESTCASE}.data.txt\" \
+        -o exec/mips_cpu_harvard_tb_${TESTCASE} testbench/mips_cpu_harvard_tb.v \
+        ${SRC} 2> /dev/null
+        ./exec/mips_cpu_harvard_tb_${TESTCASE} &> ./inputs/${INSTR}/${TESTCASE}.log.txt;             # log file for debugging (contains $display)
+        echo "$(tail -1 ./inputs/${INSTR}/${TESTCASE}.log.txt)" > ./inputs/${INSTR}/${TESTCASE}.out.txt;      # register v0 output to compare with reference
+        if diff -w ./inputs/${INSTR}/${TESTCASE}.out.txt ./inputs/${INSTR}/${TESTCASE}.ref.txt &> /dev/null   # compare
+        then 
+            echo ${TESTCASE} ${INSTR} "Pass";
+        else 
+            printf '%s %s %s%d %s%d%s\n' "${TESTCASE}" "${INSTR}" "Fail Output=" "$(tail -1 ./inputs/${INSTR}/${TESTCASE}.out.txt)" "Ref=" "$(tail -1 ./inputs/${INSTR}/${TESTCASE}.ref.txt)" 2> /dev/null;
+        fi
+    done
+fi
\ No newline at end of file