Context. There are several methods of developing software in a systematic, engineering way. One of them are traditional methods such as waterfall. Nowadays, more common are becoming agile methodologies. Agile aims at addressing and improving a communication in software projects. However, customer - supplier communication in software projects still causes many difficulties.

Objectives. In this study I wanted to identify basic customer – supplier communication problems that agile practitioners encounter in agile software projects. I also wanted to provide basic guidelines based on identified, prioritized problems and identified, prioritized solutions.

Methods. Using recently published journal articles and conference proceedings  I identify customer – supplier communication problems that agile practitioners encounter in agile software projects. In order to identify solutions, and also prioritize the identified problems I used a survey. Then, based on analysis of results of the survey foreseen guidelines were synthesized. 

Results. Literature study resulted in the identification of eight customer – supplier communication problems that agile practitioners encounter in agile software projects. The survey provided critical weighted evaluation of the problems and also suggested solutions to the problems. The obtained weighted results were used to develop the basic guidelines together with suggested solutions to each of them.

Conclusions. The research was designed to help agile practitioners in their communication with a customer. The obtained results provide basic and starting guidelines that are based on the experience of the agile practitioners. That can be further extended based on future local and individual experience of agile practitioners.