diff --git a/src/argument_types.py b/src/argument_types.py
new file mode 100644
index 0000000..7c31772
--- /dev/null
+++ b/src/argument_types.py
@@ -0,0 +1,206 @@
+from typing import ClassVar, Literal
+
+from pydantic import BaseModel, Field
+
+
+class Arguments(BaseModel):
+    """
+    Define arguments
+    """
+
+    lat: float = 0.0
+    long: float = 0.0
+    city: str = "pleasure_point"
+    show_wave: bool = True
+    show_large_wave: bool = False
+    show_uv: bool = True
+    show_height: bool = True
+    show_direction: bool = True
+    show_period: bool = True
+    show_city: bool = True
+    show_date: bool = True
+    show_air_temp: bool = False
+    show_wind_speed: bool = False
+    show_wind_direction: bool = False
+    json_output: bool = False
+    show_rain_sum: bool = False
+    show_precipitation_prob: bool = False
+    unit: Literal["imperial", "metric"] = "imperial"
+    decimal: int = Field(default=1, ge=0)
+    forecast_days: int = Field(default=0, ge=0, le=7)
+    color: str = "blue"
+    gpt: bool = False
+
+
+class ArgumentMappings(BaseModel):
+    """
+    Class for argument mappings with multiple aliases.
+    """
+
+    city: str = Field(
+        default="pleasure_point",
+        description="Name of the city you want weather data from",
+    )
+    show_wave: bool = Field(
+        default=True,
+        description="Show wave information",
+    )
+    show_large_wave: bool = Field(
+        default=False,
+        description="Show large wave information",
+    )
+    show_uv: bool = Field(
+        default=True,
+        description="Show UV information",
+    )
+    show_height: bool = Field(
+        default=True,
+        description="Show wave height information",
+    )
+    show_direction: bool = Field(
+        default=True,
+        description="Show wave direction information",
+    )
+    show_period: bool = Field(
+        default=True,
+        description="Show wave period information",
+    )
+    show_city: bool = Field(
+        default=True,
+        description="Show city information",
+    )
+    show_date: bool = Field(
+        default=True,
+        description="Show date information",
+    )
+    unit: Literal["imperial", "metric"] = Field(
+        default="imperial",
+        description="Set unit system",
+    )
+    json_output: bool = Field(
+        default=False,
+        description="Enable JSON output",
+    )
+    gpt: bool = Field(
+        default=False,
+        description="Enable GPT functionality",
+    )
+    show_air_temp: bool = Field(
+        default=False,
+        description="Show air temperature",
+    )
+    show_wind_speed: bool = Field(
+        default=False,
+        description="Show wind speed",
+    )
+    show_wind_direction: bool = Field(
+        default=False,
+        description="Show wind direction",
+    )
+    show_rain_sum: bool = Field(
+        default=False,
+        description="Show rain sum",
+    )
+    show_precipitation_prob: bool = Field(
+        default=False,
+        description="Show precipitation probability",
+    )
+
+    alias_map: ClassVar[dict[str, list[str]]] = {
+        "city": ["loc", "location"],
+        "show_wave": ["sw", "hide_wave", "hw"],
+        "show_large_wave": ["slw"],
+        "show_uv": ["suv", "hide_uv", "huv"],
+        "show_height": ["sh", "hide_height", "hh"],
+        "show_direction": ["sd", "hide_direction", "hdir"],
+        "show_period": ["sp", "hide_period", "hp"],
+        "show_city": ["sc", "hide_location", "hl"],
+        "show_date": ["sdate", "hide_date", "hdate"],
+        "unit": ["m", "metric"],
+        "json_output": ["j", "json"],
+        "gpt": ["g"],
+        "show_air_temp": ["sat"],
+        "show_wind_speed": ["sws"],
+        "show_wind_direction": ["swd"],
+        "show_rain_sum": ["srs"],
+        "show_precipitation_prob": ["spp"],
+    }
+
+    @classmethod
+    def generate_mappings(cls) -> dict[str, str]:
+        """
+        Flatten the alias map to create a mapping from each alias to the field
+        name
+        """
+        mappings = {}
+        for field_name, aliases in cls.alias_map.items():
+            for alias in aliases:
+                mappings[alias] = field_name
+        return mappings
+
+    @classmethod
+    def parse_input(cls, data: dict) -> dict:
+        alias_to_field_map = cls.generate_mappings()
+        remapped_data = {}
+        for key, value in data.items():
+            field_name = alias_to_field_map.get(key, key)
+            remapped_data[field_name] = value
+
+        return remapped_data
+
+    """
+    TODO: write method to set location and update the dictionary
+    """
+
+    @classmethod
+    def set_output_values(cls, args, arguments_dictionary: dict) -> dict:
+        """
+        Takes a list of command line arguments(args)
+        and sets the appropriate values in the
+        arguments_dictionary(show_wave = 1, etc).
+        Returns the arguments_dictionary dict with the updated CLI args
+        """
+        # map of arguments to dictionary keys & values
+        mappings = {
+            "hide_wave": ("show_wave", False),
+            "hw": ("show_wave", False),
+            "show_large_wave": ("show_large_wave", True),
+            "slw": ("show_large_wave", True),
+            "hide_uv": ("show_uv", False),
+            "huv": ("show_uv", False),
+            "hide_height": ("show_height", False),
+            "hh": ("show_height", False),
+            "hide_direction": ("show_direction", False),
+            "hdir": ("show_direction", False),
+            "hide_period": ("show_period", False),
+            "hp": ("show_period", False),
+            "hide_location": ("show_city", False),
+            "hl": ("show_city", False),
+            "hide_date": ("show_date", False),
+            "hdate": ("show_date", False),
+            "metric": ("unit", "metric"),
+            "m": ("unit", "metric"),
+            "json": ("json_output", True),
+            "j": ("json_output", True),
+            "gpt": ("gpt", True),
+            "g": ("gpt", True),
+            "show_air_temp": ("show_air_temp", True),
+            "sat": ("show_air_temp", True),
+            "show_wind_speed": ("show_wind_speed", True),
+            "sws": ("show_wind_speed", True),
+            "show_wind_direction": ("show_wind_direction", True),
+            "swd": ("show_wind_direction", True),
+            "show_rain_sum": ("show_rain_sum", True),
+            "srs": ("show_rain_sum", True),
+            "show_precipitation_prob": ("show_precipitation_prob", True),
+            "spp": ("show_precipitation_prob", True),
+        }
+        # Update arguments_dictionary based on the cli arguments in args
+        # Ex: If "hide_uv" in args,
+        # "show_uv" will be set to False in arguments_dictionary
+        for arg in args:
+            if arg in mappings:
+                key, value = mappings[arg]
+                arguments_dictionary[key] = value
+
+        return arguments_dictionary