diff --git a/src/NodaUncertaintyHelper.php b/src/NodaUncertaintyHelper.php
new file mode 100644
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+++ b/src/NodaUncertaintyHelper.php
@@ -0,0 +1,100 @@
+<?PHP
+/**
+ * Contains class NodaUncertaintyHelper.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Contains static functions for getting IDs for noda entries by various means.
+ */
+final class NodaUncertaintyHelper {
+
+    const TIME_UNCERTAINTY_PREFIXES = [
+        "um ",
+        "wohl um ",
+        "circa ",
+        "ca. ",
+        "ca "
+    ];
+
+    const TIME_UNCERTAINTY_SUFFIXES = [
+        "(?)",
+        "?",
+    ];
+
+    /**
+     * Substrings used to express uncertainty about the validity of a place name.
+     */
+    const PLACE_UNCERTAINTY_PREFIXES = [
+        "vlt. ",
+        "circa ",
+        "ca. ",
+        "ca ",
+    ];
+
+    const PLACE_UNCERTAINTY_SUFFIXES = [
+        "(?)",
+        "?",
+    ];
+
+    /**
+     * Attempts guessing whether time is uncertain.
+     *
+     * @param string $zeit_name Time name.
+     *
+     * @return boolean
+     */
+    public static function guessTimeCertainty(string $zeit_name):bool {
+
+        $zeit_name = \strtolower($zeit_name);
+
+        // Attempt to guess uncertainty based on prefixes.
+        foreach (self::TIME_UNCERTAINTY_PREFIXES as $prefix) {
+            if (\substr($zeit_name, 0, \strlen($prefix)) === $prefix) {
+                return false; // Uncertainty found
+            }
+        }
+
+        // Attempt to guess uncertainty based on prefixes.
+        foreach (self::TIME_UNCERTAINTY_SUFFIXES as $prefix) {
+            if (\substr($zeit_name, -1 * \strlen($prefix)) === $prefix) {
+                return false; // Uncertainty found
+            }
+        }
+
+        return true; // No uncertainty found
+
+    }
+
+    /**
+     * Attempts guessing whether place is uncertain.
+     *
+     * @param string $ort_name Place name.
+     *
+     * @return boolean
+     */
+    public static function guessPlaceCertainty(string $ort_name):bool {
+
+        $ort_name = \strtolower($ort_name);
+
+        // Attempt to guess uncertainty based on prefixes.
+        foreach (NodaUncertaintyHelper::PLACE_UNCERTAINTY_PREFIXES as $prefix) {
+            if (\substr($ort_name, 0, \strlen($prefix)) === $prefix) {
+                return false; // Uncertain
+            }
+        }
+
+        // Attempt to guess uncertainty based on prefixes.
+        foreach (NodaUncertaintyHelper::PLACE_UNCERTAINTY_SUFFIXES as $prefix) {
+            if (\substr($ort_name, -1 * \strlen($prefix)) === $prefix) {
+                return false; // Uncertain
+            }
+        }
+
+        return true; // Certain / no uncertainty found
+
+    }
+
+}