The previous decade has seen producers focusing on cost cutting. While this has been valuable in strengthening the industry against oil and gas price fluctuations, obtaining good reservoir information is still the most important and necessary cost for maximizing profitability. It is shown that well test analysis serves several important purposes in the economic development of shallow field. A simple method is proposed to detect "limited reservoir behaviour". The paper shows how well testing is integrated into field development. Three fields examples of shallow gas reservoirs are presented. The paper concludes that shallow reservoirs are often more accurately modelled using the composite and multi-composite reservoir model. It further concludes that careful engineering judgement is required when using the material balance approach in gas reservoirs to determine the original gas in place.