diff --git a/diagnostic_base.go b/diagnostic_base.go
new file mode 100644
index 0000000..a3062a8
--- /dev/null
+++ b/diagnostic_base.go
@@ -0,0 +1,26 @@
+package dag
+
+type diagnosticBase struct {
+	severity dag.Severity
+	summary  string
+	detail   string
+}
+
+func Diagnostic(severity dag.Severity, summary, detail string) dag.Diagnostic {
+	return diagnosticBase{
+		severity: severity,
+		summary:  summary,
+		detail:   detail,
+	}
+}
+
+func (d diagnosticBase) Severity() dag.Severity {
+	return d.severity
+}
+
+func (d diagnosticBase) Description() dag.Description {
+	return dag.Description{
+		Summary: d.summary,
+		Detail:  d.detail,
+	}
+}
\ No newline at end of file