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diff --git a/R/summary.mmkin.R b/R/summary.mmkin.R
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+#' Summary method for class "mmkin"
+#'
+#' Shows convergence information on the [mkinfit] objects contained in the object
+#' and gives an overview of ill-defined parameters calculated by [illparms].
+#'
+#' @param object an object of class [mmkin]
+#' @param x an object of class \code{summary.mmkin}.
+#' @param conf.level confidence level for testing parameters
+#' @param digits number of digits to use for printing
+#' @param \dots optional arguments passed to methods like \code{print}.
+#' @examples
+#'
+#' fits <- mmkin(
+#'   c("SFO", "FOMC"),
+#'   list("FOCUS A" = FOCUS_2006_A,
+#'        "FOCUS C" = FOCUS_2006_C),
+#'   quiet = TRUE, cores = 1)
+#'   summary(fits)
+#'
+#' @export
+summary.mmkin <- function(object, conf.level = 0.95, ...) {
+
+  ans <- list(
+    err_mod = object[[1, 1]]$err_mod,
+    time = attr(object, "time"),
+    illparms = illparms(object),
+    convergence = convergence(object)
+  )
+
+  class(ans) <- c("summary.mmkin")
+  return(ans)
+}
+
+#' @rdname summary.mmkin
+#' @export
+print.summary.mmkin <- function(x, digits = max(3, getOption("digits") - 3), ...) {
+  if (!is.null(x$err_mod)) {
+    cat("Error model: ")
+    cat(switch(x$err_mod,
+               const = "Constant variance",
+               obs = "Variance unique to each observed variable",
+               tc = "Two-component variance function"), "\n")
+  }
+  cat("Fitted in", x$time[["elapsed"]],  "s\n")
+
+  cat("\nConvergence:\n")
+  print(x$convergence)
+
+  if (any(x$illparms != "")) {
+    cat("\nIll-defined parameters:\n")
+    print(x$illparms)
+  }
+
+  invisible(x)
+}
+