diff --git a/src/main/java/staffconnect/model/availability/Availability.java b/src/main/java/staffconnect/model/availability/Availability.java
new file mode 100644
index 00000000000..dc8df4673c6
--- /dev/null
+++ b/src/main/java/staffconnect/model/availability/Availability.java
@@ -0,0 +1,87 @@
+package staffconnect.model.availability;
+
+import static java.util.Objects.requireNonNull;
+import static staffconnect.commons.util.AppUtil.checkArgument;
+
+import java.time.DayOfWeek;
+/**
+ * Represents a Person's availability in the staff book.
+ * Guarantees: immutable; is valid as declared in {@link #isValidAvailability(String)}
+ */
+public class Availability {
+
+
+    public static final String MESSAGE_CONSTRAINTS =
+            "Should be a week of the day, the full word or the first syllable of the word";
+    public static final String VALIDATION_REGEX = "(?i)((mon|tue(s)?|wed(nes)?|thu(r)?(rs)?|fri|sat(ur)?|sun)(day)?)";
+
+    public final String value;
+
+    /**
+     * Constructs a {@code Availability}.
+     *
+     * @param availability A valid availability.
+     */
+    public Availability(String availability) {
+        requireNonNull(availability);
+        checkArgument(isValidAvailability(availability), MESSAGE_CONSTRAINTS);
+        value = strToDayOfWeek(availability);
+    }
+
+    /**
+     * Returns true if a given string is a valid availability.
+     */
+    public static boolean isValidAvailability(String test) {
+        return test.matches(VALIDATION_REGEX);
+    }
+
+    /**
+     * Returns a standardised Day of the Week.
+     *
+     * @param validAvailability validatedAvailability to be translated.
+     * @return Corresponding Day of Week.
+     */
+    public static String strToDayOfWeek(String validAvailability) {
+        if (validAvailability.matches("(?i)(mon)(day)?")) {
+            return DayOfWeek.MONDAY.name();
+        } else if (validAvailability.matches("(?i)(tue)(s)?(sday)?")) {
+            return DayOfWeek.TUESDAY.name();
+        } else if (validAvailability.matches("(?i)(wed)(nes)?(nesday)?")) {
+            return DayOfWeek.WEDNESDAY.name();
+        } else if (validAvailability.matches("(?i)(thu)(r)?(rs)?(rsday)?")) {
+            return DayOfWeek.THURSDAY.name();
+        } else if (validAvailability.matches("(?i)(fri)(day)?")) {
+            return DayOfWeek.FRIDAY.name();
+        } else if (validAvailability.matches("(?i)(sat)(ur)?(urday)?")) {
+            return DayOfWeek.SATURDAY.name();
+        } else {
+            return DayOfWeek.SUNDAY.name();
+        }
+    }
+
+    @Override
+    public String toString() {
+        return '[' + value + ']';
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other == this) {
+            return true;
+        }
+
+        // instanceof handles nulls
+        if (!(other instanceof Availability)) {
+            return false;
+        }
+
+        Availability otherAvailability = (Availability) other;
+        return value.equals(otherAvailability.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return value.hashCode();
+    }
+
+}
diff --git a/src/test/java/staffconnect/model/availability/AvailabilityTest.java b/src/test/java/staffconnect/model/availability/AvailabilityTest.java
new file mode 100644
index 00000000000..d10ba39d211
--- /dev/null
+++ b/src/test/java/staffconnect/model/availability/AvailabilityTest.java
@@ -0,0 +1,111 @@
+package staffconnect.model.availability;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static staffconnect.testutil.Assert.assertThrows;
+
+import java.time.DayOfWeek;
+
+import org.junit.jupiter.api.Test;
+
+public class AvailabilityTest {
+
+    @Test
+    public void constructor_null_throwsNullPointerException() {
+        assertThrows(NullPointerException.class, () -> new Availability(null));
+    }
+
+    @Test
+    public void constructor_invalidAvailability_throwsIllegalArgumentException() {
+        String invalidAvailability = "";
+        assertThrows(IllegalArgumentException.class, () -> new Availability(invalidAvailability));
+    }
+
+    @Test
+    public void isValidAvailability() {
+        // null availability
+        assertThrows(NullPointerException.class, () -> Availability.isValidAvailability(null));
+
+        // invalid availability
+        assertFalse(Availability.isValidAvailability("")); // empty string
+        assertFalse(Availability.isValidAvailability(" ")); // spaces only
+        assertFalse(Availability.isValidAvailability("m")); // 1 letter only
+        assertFalse(Availability.isValidAvailability("1")); // 1 number only
+        assertFalse(Availability.isValidAvailability("m o n")); // spaces between letters
+        assertFalse(Availability.isValidAvailability("birthday")); // incorrect type of day
+        assertFalse(Availability.isValidAvailability("moon")); // 1 letter duplicated
+        assertFalse(Availability.isValidAvailability("mon123")); // trailing number behind day
+        assertFalse(Availability.isValidAvailability("#@$!")); // special characters
+        assertFalse(Availability.isValidAvailability("mon#@$!")); // prefix and special characters
+        assertFalse(Availability.isValidAvailability("123#@$!")); // numbers and special characters
+        assertFalse(Availability.isValidAvailability("day")); // day without prefix
+        assertFalse(Availability.isValidAvailability("sytaudrh")); // scrambled spelling
+        assertFalse(Availability.isValidAvailability("chewsday")); // misspelling
+        assertFalse(Availability.isValidAvailability("th")); // uncompleted syllable
+        assertFalse(Availability.isValidAvailability("sun day")); // space between syllable
+        assertFalse(Availability.isValidAvailability("sat day")); // missing middle syllable
+        assertFalse(Availability.isValidAvailability("satuday")); // missing middle letter
+
+        // valid availability
+        assertTrue(Availability.isValidAvailability("mon")); // first syllable tuesday
+        assertTrue(Availability.isValidAvailability("tue")); // first syllable tuesday without s
+        assertTrue(Availability.isValidAvailability("tues")); // first syllable tuesday with s
+        assertTrue(Availability.isValidAvailability("wed")); // first syllable wednesday
+        assertTrue(Availability.isValidAvailability("wednes")); // two syllable wednesday
+        assertTrue(Availability.isValidAvailability("thu")); // first syllable thursday without rs
+        assertTrue(Availability.isValidAvailability("thur")); // first syllable thursday without s
+        assertTrue(Availability.isValidAvailability("thurs")); // first syllable thursday with s
+        assertTrue(Availability.isValidAvailability("sat")); // first syllable saturday
+        assertTrue(Availability.isValidAvailability("satur")); // two syllable saturday
+        assertTrue(Availability.isValidAvailability("sun")); // first syllable sunday
+        assertTrue(Availability.isValidAvailability("Sun")); // first syllable with capitalised first letter
+        assertTrue(Availability.isValidAvailability("sAtUr")); // two syllable mixed case
+        assertTrue(Availability.isValidAvailability("monday")); // full word lowercase monday
+        assertTrue(Availability.isValidAvailability("tuesday")); // full word lowercase tuesday
+        assertTrue(Availability.isValidAvailability("wednesday")); // full word lowercase wednesday
+        assertTrue(Availability.isValidAvailability("thursday")); // full word lowercase thursday
+        assertTrue(Availability.isValidAvailability("friday")); // full word lowercase friday
+        assertTrue(Availability.isValidAvailability("saturday")); // full word lowercase saturday
+        assertTrue(Availability.isValidAvailability("sunday")); // full word lowercase sunday
+        assertTrue(Availability.isValidAvailability("MONDAY")); // full word uppercase monday
+        assertTrue(Availability.isValidAvailability("Tuesday")); // full word with capitalised first letter
+        assertTrue(Availability.isValidAvailability("wEdNeSdAy")); // full word mixed case
+    }
+
+    @Test
+    public void equals() {
+        Availability monAvailability = new Availability("monday");
+
+        // same values -> returns true
+        assertTrue(monAvailability.equals(new Availability("monday")));
+
+        // same day -> return true
+        assertTrue(monAvailability.equals(new Availability("mOn")));
+
+        // same object -> returns true
+        assertTrue(monAvailability.equals(monAvailability));
+
+        // null -> returns false
+        assertFalse(monAvailability.equals(null));
+
+        // different types -> returns false
+        assertFalse(monAvailability.equals(5.0f));
+
+        // different values -> returns false, mon and tues
+        assertFalse(monAvailability.equals(new Availability("tues")));
+
+    }
+
+    @Test
+    public void strToDayOfWeekTest() {
+        assertEquals(DayOfWeek.MONDAY.toString(), Availability.strToDayOfWeek(new String("mon")));
+        assertEquals(DayOfWeek.TUESDAY.toString(), Availability.strToDayOfWeek(new String("tues")));
+        assertEquals(DayOfWeek.WEDNESDAY.toString(), Availability.strToDayOfWeek(new String("wednes")));
+        assertEquals(DayOfWeek.THURSDAY.toString(), Availability.strToDayOfWeek(new String("thursday")));
+        assertEquals(DayOfWeek.FRIDAY.toString(), Availability.strToDayOfWeek(new String("FRIDAY")));
+        assertEquals(DayOfWeek.SATURDAY.toString(), Availability.strToDayOfWeek(new String("SATurday")));
+        assertEquals(DayOfWeek.SUNDAY.toString(), Availability.strToDayOfWeek(new String("sunDAY")));
+    }
+
+}
diff --git a/src/test/java/staffconnect/model/person/ModuleTest.java b/src/test/java/staffconnect/model/person/ModuleTest.java
index dc1cf7613c3..a9c205e3fe0 100644
--- a/src/test/java/staffconnect/model/person/ModuleTest.java
+++ b/src/test/java/staffconnect/model/person/ModuleTest.java
@@ -21,10 +21,10 @@ public void constructor_invalidModule_throwsIllegalArgumentException() {
 
     @Test
     public void isValidModule() {
-        // null phone number
+        // null module code
         assertThrows(NullPointerException.class, () -> Module.isValidModule(null));
 
-        // invalid phone numbers
+        // invalid module code
         assertFalse(Module.isValidModule("")); // empty string
         assertFalse(Module.isValidModule(" ")); // spaces only
         assertFalse(Module.isValidModule("ABCD")); // letters only
@@ -38,7 +38,7 @@ public void isValidModule() {
         assertFalse(Module.isValidModule("cs2103t")); // suffix not capitalised
         assertFalse(Module.isValidModule("cs2103T")); // prefix not capitalised
 
-        // valid phone numbers
+        // valid module code
         assertTrue(Module.isValidModule("CS2103")); // 2 prefix, 4 letters without 1 optional suffix
         assertTrue(Module.isValidModule("CS2103T")); // 2 prefix, 4 letters with 1 optional suffix
         assertTrue(Module.isValidModule("GEN2050")); // 3 prefix, 4 letters without  1 optional suffix