---
title: "Planner-BESM-6 Systems Implementation Methods"
authors:
  - "V. Pilshikov"
doi: ""
url: "https://ijcai.org/proceedings/1975/90"
pdf: "https://ijcai.org/proceedings/1975/0090.pdf"
venue: "Proceedings of the Fourth International Joint Conference on Artificial Intelligence"
year: 1975
pages: "575-577"
track: "A.I. Software"
keywords:
---

# Planner-BESM-6 Systems Implementation Methods

V. Pilshikov

*Proceedings of the Fourth International Joint Conference on Artificial Intelligence*, pages 575-577.

## Abstract

This paper describes some new methods used in PLANNER-BESM-6 system for the implementation of PLANNER. Backtracking is implemented with a single stack and no copying of activation frames is needed. Lists are represented as arrays of pointers; the garbage collector for this representation requires no additional memory. Restrictions on variable values are accomplished by using 'semi-defined' structures. These methods have enabled to achieve the high efficiency of the system work.