diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationEvent.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationEvent.kt
new file mode 100644
index 00000000..f258a63d
--- /dev/null
+++ b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationEvent.kt
@@ -0,0 +1,12 @@
+package com.intelligentbackpack.schooldomain.entities.calendar.alteration
+
+import com.intelligentbackpack.schooldomain.entities.calendar.CalendarEvent
+
+/**
+ * Represents an event that alters the original calendar.
+ *
+ * @property event the event that alters the original calendar
+ */
+interface AlterationEvent {
+    val event: CalendarEvent
+}
diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationFactory.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationFactory.kt
new file mode 100644
index 00000000..d575efc1
--- /dev/null
+++ b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationFactory.kt
@@ -0,0 +1,235 @@
+package com.intelligentbackpack.schooldomain.entities.calendar.alteration
+
+import com.intelligentbackpack.schooldomain.entities.calendar.CalendarEvent
+import com.intelligentbackpack.schooldomain.entities.calendar.DateEvent
+import com.intelligentbackpack.schooldomain.entities.calendar.WeekEvent
+import com.intelligentbackpack.schooldomain.exceptions.EventDateException
+import java.time.LocalDate
+
+/**
+ * Factory for creating alteration of events.
+ *
+ */
+object AlterationFactory {
+    private fun isEventOnDate(event: CalendarEvent, date: LocalDate): Boolean =
+        when (event) {
+            is DateEvent -> event.date == date
+            is WeekEvent ->
+                event.day == date.dayOfWeek &&
+                    event.fromDate <= date && event.toDate >= date
+
+            else -> false
+        }
+
+    /**
+     * Creates an alteration for a new event.
+     *
+     * @param newEvent the new event
+     * @return the alteration for the new event
+     */
+    fun createNewEvent(newEvent: CalendarEvent): AlterationEvent =
+        object : NewEvent {
+            override fun isNewEventOnDate(date: LocalDate): Boolean = isEventOnDate(newEvent, date)
+
+            override val event: CalendarEvent
+                get() = newEvent
+        }
+
+    private fun checkCancelOriginalEventSingleDay(
+        originalEvent: CalendarEvent,
+        date: LocalDate,
+        alterationEvent: AlterationEvent,
+    ): AlterationEvent {
+        when (originalEvent) {
+            is DateEvent -> {
+                if (originalEvent.date != date) {
+                    throw EventDateException()
+                } else {
+                    return alterationEvent
+                }
+            }
+
+            is WeekEvent -> {
+                if (originalEvent.day != date.dayOfWeek) {
+                    throw EventDateException()
+                } else if (originalEvent.fromDate.isAfter(date) || originalEvent.toDate.isBefore(date)) {
+                    throw EventDateException()
+                } else {
+                    return alterationEvent
+                }
+            }
+
+            else -> {
+                throw IllegalArgumentException("Original event must be a DateEvent or WeekEvent")
+            }
+        }
+    }
+
+    private fun checkCancelOriginalEventIntervalOfDays(
+        originalEvent: CalendarEvent,
+        initialDate: LocalDate,
+        finalDate: LocalDate,
+        alterationEvent: AlterationEvent,
+    ): AlterationEvent {
+        if (initialDate.isAfter(finalDate)) {
+            throw EventDateException()
+        } else {
+            when (originalEvent) {
+                is DateEvent -> {
+                    if (originalEvent.date !in initialDate..finalDate) {
+                        throw EventDateException()
+                    } else {
+                        return alterationEvent
+                    }
+                }
+
+                is WeekEvent -> {
+                    if (originalEvent.fromDate.isAfter(initialDate) || originalEvent.toDate.isBefore(finalDate)) {
+                        throw EventDateException()
+                    } else {
+                        return alterationEvent
+                    }
+                }
+
+                else -> {
+                    throw IllegalArgumentException("Original event must be a DateEvent or WeekEvent")
+                }
+            }
+        }
+    }
+
+    private fun checkRescheduleEvent(
+        originalEvent: CalendarEvent,
+        newEvent: CalendarEvent,
+        checkCancelOriginalEvent: () -> AlterationEvent,
+    ): AlterationEvent {
+        if (originalEvent == newEvent) {
+            throw IllegalArgumentException("New event must be different from rescheduled event")
+        } else {
+            return checkCancelOriginalEvent()
+        }
+    }
+
+    /**
+     * Creates an alteration for a rescheduled event that occurs in a single day.
+     *
+     * @param newEvent the new event
+     * @param dateOriginalEvent the date of the original event
+     * @param originalEvent the original event
+     * @return the alteration for the rescheduled event
+     * @throws IllegalArgumentException if the new event is the same as the original event
+     * @throws EventDateException if the date of the original event is different from the date of the new event
+     * @throws IllegalArgumentException if the original event is not a [DateEvent] or [WeekEvent]
+     */
+    fun createRescheduleSingleDayEvent(
+        newEvent: CalendarEvent,
+        dateOriginalEvent: LocalDate,
+        originalEvent: CalendarEvent,
+    ): AlterationEvent {
+        val alterationEvent = object : RescheduleEvent, SingleDayAlteration {
+            override val event: CalendarEvent
+                get() = newEvent
+            override val date: LocalDate
+                get() = dateOriginalEvent
+            override val originalEvent: CalendarEvent
+                get() = originalEvent
+
+            override fun wasEventRescheduledOnDate(date: LocalDate): Boolean = this.date == date
+
+            override fun isNewEventOnDate(date: LocalDate): Boolean = isEventOnDate(newEvent, date)
+        }
+        return checkRescheduleEvent(originalEvent, newEvent) {
+            checkCancelOriginalEventSingleDay(originalEvent, dateOriginalEvent, alterationEvent)
+        }
+    }
+
+    /**
+     * Creates an alteration for a rescheduled event that occurs in an interval of days.
+     *
+     * @param initialDate the initial date of the interval
+     * @param finalDate the final date of the interval
+     * @param originalEvent the original event
+     * @param newEvent the new event
+     * @return the alteration for the rescheduled event
+     * @throws IllegalArgumentException if the new event is the same as the original event
+     * @throws EventDateException if the interval of the original event is different from the interval of the new event
+     * @throws IllegalArgumentException if the original event is not a [DateEvent] or [WeekEvent]
+     */
+    fun createRescheduleIntervalOfDaysEvent(
+        initialDate: LocalDate,
+        finalDate: LocalDate,
+        originalEvent: CalendarEvent,
+        newEvent: CalendarEvent,
+    ): AlterationEvent {
+        val alterationEvent = object : RescheduleEvent, IntervalOfDaysAlteration {
+            override val event: CalendarEvent
+                get() = newEvent
+            override val initialDate: LocalDate
+                get() = initialDate
+            override val finalDate: LocalDate
+                get() = finalDate
+            override val originalEvent: CalendarEvent
+                get() = originalEvent
+
+            override fun wasEventRescheduledOnDate(date: LocalDate): Boolean =
+                date in initialDate..finalDate
+
+            override fun isNewEventOnDate(date: LocalDate): Boolean = isEventOnDate(newEvent, date)
+        }
+        return checkRescheduleEvent(originalEvent, newEvent) {
+            checkCancelOriginalEventIntervalOfDays(originalEvent, initialDate, finalDate, alterationEvent)
+        }
+    }
+
+    /**
+     * Creates an alteration for a cancelled event that occurs in a single day.
+     *
+     * @param date the date of the cancelled event
+     * @param cancelledEvent the cancelled event
+     * @return the alteration for the cancelled event
+     * @throws EventDateException if the date of the cancelled event is different from the date of the new event
+     * @throws IllegalArgumentException if the cancelled event is not a [DateEvent] or [WeekEvent]
+     */
+    fun createCancelSingleDayEvent(date: LocalDate, cancelledEvent: CalendarEvent): AlterationEvent {
+        val alterationEvent = object : CancelEvent, SingleDayAlteration {
+            override fun isEventCancelledOnDate(date: LocalDate): Boolean =
+                date == this.date
+
+            override val event: CalendarEvent
+                get() = cancelledEvent
+            override val date: LocalDate
+                get() = date
+        }
+        return checkCancelOriginalEventSingleDay(cancelledEvent, date, alterationEvent)
+    }
+
+    /**
+     * Creates an alteration for a cancelled event that occurs in an interval of days.
+     *
+     * @param initialDate the initial date of the interval
+     * @param finalDate the final date of the interval
+     * @param cancelledEvent the cancelled event
+     * @return the alteration for the cancelled event
+     * @throws EventDateException if the interval of the cancelled event is different from the interval of the new event
+     * @throws IllegalArgumentException if the cancelled event is not a [DateEvent] or [WeekEvent]
+     */
+    fun createCancelIntervalOfDaysEvent(
+        initialDate: LocalDate,
+        finalDate: LocalDate,
+        cancelledEvent: CalendarEvent,
+    ): AlterationEvent {
+        val alterationEvent = object : CancelEvent, IntervalOfDaysAlteration {
+            override fun isEventCancelledOnDate(date: LocalDate): Boolean {
+                return date in initialDate..finalDate
+            }
+
+            override val event: CalendarEvent
+                get() = cancelledEvent
+            override val initialDate: LocalDate
+                get() = initialDate
+            override val finalDate: LocalDate
+                get() = finalDate
+        }
+        return checkCancelOriginalEventIntervalOfDays(cancelledEvent, initialDate, finalDate, alterationEvent)
+    }
+}
diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationType.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationType.kt
deleted file mode 100644
index 32964eb6..00000000
--- a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/AlterationType.kt
+++ /dev/null
@@ -1,8 +0,0 @@
-package com.intelligentbackpack.schooldomain.entities.calendar.alteration
-
-enum class AlterationType {
-    CANCELLED,
-    RESCHEDULED,
-    CHANGED_PROFESSOR,
-    CHANGED_SUBJECT,
-}
diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/CancelEvent.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/CancelEvent.kt
new file mode 100644
index 00000000..08cab816
--- /dev/null
+++ b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/CancelEvent.kt
@@ -0,0 +1,18 @@
+package com.intelligentbackpack.schooldomain.entities.calendar.alteration
+
+import java.time.LocalDate
+
+/**
+ * Represents an event that cancel an event from the original calendar.
+ *
+ * @property event the event that has been cancelled
+ */
+interface CancelEvent : AlterationEvent {
+    /**
+     * Checks if the event is cancelled on the given date.
+     *
+     * @param date the date to check
+     * @return true if the event is cancelled on the given date, false otherwise
+     */
+    fun isEventCancelledOnDate(date: LocalDate): Boolean
+}
diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/IntervalOfDaysAlteration.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/IntervalOfDaysAlteration.kt
new file mode 100644
index 00000000..92a4b150
--- /dev/null
+++ b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/IntervalOfDaysAlteration.kt
@@ -0,0 +1,14 @@
+package com.intelligentbackpack.schooldomain.entities.calendar.alteration
+
+import java.time.LocalDate
+
+/**
+ * Represents an alteration event that alters the original calendar for an interval of days
+ *
+ * @property initialDate the initial date of the interval
+ * @property finalDate the final date of the interval
+ */
+interface IntervalOfDaysAlteration : AlterationEvent {
+    val initialDate: LocalDate
+    val finalDate: LocalDate
+}
diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/NewEvent.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/NewEvent.kt
new file mode 100644
index 00000000..ae742991
--- /dev/null
+++ b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/NewEvent.kt
@@ -0,0 +1,19 @@
+package com.intelligentbackpack.schooldomain.entities.calendar.alteration
+
+import java.time.LocalDate
+
+/**
+ * Represents a new event that is added to the original calendar.
+ *
+ * @property event the new event
+ */
+interface NewEvent : AlterationEvent {
+
+    /**
+     * Checks if the new event is on the given date.
+     *
+     * @param date the date to check
+     * @return true if the new event is on the given date, false otherwise
+     */
+    fun isNewEventOnDate(date: LocalDate): Boolean
+}
diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/RescheduleEvent.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/RescheduleEvent.kt
new file mode 100644
index 00000000..72963057
--- /dev/null
+++ b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/RescheduleEvent.kt
@@ -0,0 +1,30 @@
+package com.intelligentbackpack.schooldomain.entities.calendar.alteration
+
+import com.intelligentbackpack.schooldomain.entities.calendar.CalendarEvent
+import java.time.LocalDate
+
+/**
+ * Represents an event that reschedules an event from the original calendar.
+ *
+ * @property originalEvent the event that has been rescheduled
+ * @property event the new event
+ */
+interface RescheduleEvent : AlterationEvent {
+    val originalEvent: CalendarEvent
+
+    /**
+     * Checks if the event rescheduled was on the given date.
+     *
+     * @param date the date to check
+     * @return true if the event rescheduled was on the given date, false otherwise
+     */
+    fun wasEventRescheduledOnDate(date: LocalDate): Boolean
+
+    /**
+     * Checks if the new event is on the given date.
+     *
+     * @param date the date to check
+     * @return true if the new event is on the given date, false otherwise
+     */
+    fun isNewEventOnDate(date: LocalDate): Boolean
+}
diff --git a/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/SingleDayAlteration.kt b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/SingleDayAlteration.kt
new file mode 100644
index 00000000..6651882b
--- /dev/null
+++ b/schoolDomain/src/main/kotlin/com/intelligentbackpack/schooldomain/entities/calendar/alteration/SingleDayAlteration.kt
@@ -0,0 +1,12 @@
+package com.intelligentbackpack.schooldomain.entities.calendar.alteration
+
+import java.time.LocalDate
+
+/**
+ * Represents an alteration event that alters the original calendar for a single day
+ *
+ * @property date the date in which the alteration occurs
+ */
+interface SingleDayAlteration {
+    val date: LocalDate
+}