stabs (sometimes written STABS) is a debugging data format for storing information about computer programs for use by symbolic and source-level debuggers. (The information is stored in symbol table strings; hence the name "stabs".) Cygnus Support attributes the invention of stabs to Peter Kessler for the Berkeley Pascal pdx debugger,[1] however, he claims otherwise, stating stabs came with adb and sdb but could predate those.[2] Mark Linton , who created pdx for his 1981 master's thesis and later developed it into dbx, states his doctoral adviser Michael L. Powell "contributed to the stabstrings design, especially to support Modula-2".[3]