The following brief explanation was contained in the booklet produced to accompany a Retrospective of Lenkiewicz's work in 1997.

In 1996 Lenkiewicz embarked on the largest of all his projects to date. The theme is Addictive Behaviour. This project is an attempt to define and clarify the basic tenets that have run through the 19 previous projects. It is intended that Project 20 should consolidate clearly and simply the common issues. The Addiction project will be divided into eight sections: Section one will deal with conventionally socially recognised addictive scenarios, alcohol, drugs, gambling and eating disorders. Section two will represent the largest single addictive scenario experienced by the human race, cross culturally and at all ages - falling in love. This section will be the hub of the wheel of addictions. Section three will deal with theological persuasions. There are over 800 versions of Jesus culture in England alone, a considerable proportion of them in the South West. The fourth Section will deal with social and political convictions "I've voted Tory/Labour all my life" etc. Section five will look at the concept of the family, " I Love my little Billy but he'd better not play with dirty Johnny down the road." Children as property etc. Section six will look at the vast and cross-referential eccentricities of addictions and obsessive behaviours, from self-mutilation to collecting hosiery. Attitudes towards cars, houses, gardens, and other 'collecting' behaviours. Section seven will deal with creativity in relation to addiction. "I'm a writer/ poet/ painter/ actor/ dancer" etc. Finally, Lenkiewicz will conclude with section eight on Bibliomania. This project it is hoped, will involve 800 sitters, from the widest possible range of life experience. Each of the sitters has been asked to write a minimum of 1000 words on their circumstances and on their opinion as to what addiction is. By means of this project Lenkiewicz hopes to get closer to the physiological essentials that may cause 'fanatical belief system' behaviour and to explain the impulse that many of us have to subjugate private thought for mass thought, private responsibility for mass responsibility. He does not think there is a more appropriate line of enquiry than to consider the reasons why individuals and groups of people experience such a high failure rate in getting on with each other.