diff --git a/pymc_marketing/model_builder.py b/pymc_marketing/model_builder.py
index 91463693..71309dd6 100644
--- a/pymc_marketing/model_builder.py
+++ b/pymc_marketing/model_builder.py
@@ -270,29 +270,30 @@ def build_model(
 
     def sample_model(
         self,
-        prior_kwargs: Optional[Dict] = None,
-        posterior_kwargs: Optional[Dict] = None,
-        **kwargs,
-    ):
+        prior_predictive: bool = False,
+        posterior_predictive: bool = False,
+        prior_predictive_kwargs: Optional[Dict] = None,
+        posterior_predictive_kwargs: Optional[Dict] = None,
+        **sample_kwargs,
+    ) -> az.InferenceData:
         """
         Sample from the PyMC model.
 
         Parameters
         ----------
-        prior_kwargs : dict, optional
+        prior_predictive : bool, optional
+            If True, the inference data will be extended with samples drawn from the prior predictive distribution.
+            Defaults to False.
+        posterior_predictive : bool, optional
+            If True, the inference data will be extended with samples drawn from the posterior predictive distribution.
+            Defaults to False.
+        prior_predictive_kwargs : dict, optional
             keyword arguments to pass to the PyMC prior predictive sampler.
-        posterior_kwargs : dict, optional
+        posterior_predictive_kwargs : dict, optional
             keyword arguments to pass to the PyMC posterior predictive sampler.
+
         **kwargs : dict
             Additional keyword arguments to pass to the PyMC sampler.
-            - prior_predictive : bool, optional
-                If True, the inference data will be extended with samples drawn from the prior predictive distribution.
-                Defaults to False.
-
-            - posterior_predictive : bool, optional
-                If True, the inference data will be extended with samples drawn from the posterior predictive distribution.
-                Defaults to False.
-        Returns
         -------
         xarray.Dataset
             The PyMC samples dataset.
@@ -306,28 +307,29 @@ def sample_model(
         --------
         >>> self.build_model()
         >>> idata = self.sample_model(draws=100, tune=10)
+
+        Returns
+        -------
+        idata : az.InferenceData
+            InferenceData object containing the samples.
         """
         if self.model is None:
             raise RuntimeError(
                 "The model hasn't been built yet, call .build_model() first or call .fit() instead."
             )
-        prior_predictive = kwargs.pop("prior_predictive", False)
-        posterior_predictive = kwargs.pop("posterior_predictive", False)
+        if prior_predictive_kwargs is None:
+            prior_predictive_kwargs = {}
+        if posterior_predictive_kwargs is None:
+            posterior_predictive_kwargs = {}
         with self.model:
-            sampler_args = {**self.sampler_config, **kwargs}
+            sampler_args = {**self.sampler_config, **sample_kwargs}
             idata = pm.sample(**sampler_args)
             if prior_predictive:
-                if prior_kwargs is not None:
-                    idata.extend(pm.sample_prior_predictive(**prior_kwargs))
-                else:
-                    idata.extend(pm.sample_prior_predictive())
+                idata.extend(pm.sample_prior_predictive(**prior_predictive_kwargs))
             if posterior_predictive:
-                if prior_kwargs is not None:
-                    idata.extend(
-                        pm.sample_posterior_predictive(idata, **posterior_kwargs)
-                    )
-                else:
-                    idata.extend(pm.sample_posterior_predictive(idata))
+                idata.extend(
+                    pm.sample_posterior_predictive(idata, **posterior_predictive_kwargs)
+                )
 
         idata = self.set_idata_attrs(idata)
         return idata
@@ -509,9 +511,9 @@ def fit(
         sample_kwargs : Optional[Dict]
             Allows for passing additional keyword arguments to the sample_model method
             possible arguments are:
-            - prior_kwargs : dict, optional
+            - prior_predictive_kwargs : dict, optional
                 keyword arguments to pass to the PyMC prior predictive sampler.
-            - posterior_kwargs : dict, optional
+            - posterior_predictive_kwargs : dict, optional
                 keyword arguments to pass to the PyMC posterior predictive sampler.
             - prior_predictive : bool, optional
                 If True, the inference data will be extended with samples drawn from the prior predictive distribution.
@@ -548,15 +550,17 @@ def fit(
         sampler_config["random_seed"] = random_seed
         sampler_config.update(**kwargs)
 
-        prior_kwargs = {}
-        posterior_kwargs = {}
+        prior_predictive_kwargs = {}
+        posterior_predictive_kwargs = {}
         prior_predictive = False
         posterior_predictive = False
         if sample_kwargs is not None:
-            if "prior_kwargs" in sample_kwargs:
-                prior_kwargs = sample_kwargs.pop("prior_kwargs")
-            if "posterior_kwargs" in sample_kwargs:
-                posterior_kwargs = sample_kwargs.pop("posterior_kwargs")
+            if "prior_predictive_kwargs" in sample_kwargs:
+                prior_predictive_kwargs = sample_kwargs.pop("prior_predictive_kwargs")
+            if "posterior_predictive_kwargs" in sample_kwargs:
+                posterior_predictive_kwargs = sample_kwargs.pop(
+                    "posterior_predictive_kwargs"
+                )
             if "prior_predictive" in sample_kwargs:
                 prior_predictive = sample_kwargs.pop("prior_predictive")
             if "posterior_predictive" in sample_kwargs:
@@ -564,8 +568,8 @@ def fit(
 
         # Merge all arguments and pass to sample_model
         self.idata = self.sample_model(
-            prior_kwargs=prior_kwargs,
-            posterior_kwargs=posterior_kwargs,
+            prior_predictive_kwargs=prior_predictive_kwargs,
+            posterior_predictive_kwargs=posterior_predictive_kwargs,
             prior_predictive=prior_predictive,
             posterior_predictive=posterior_predictive,
             **sampler_config,