Construction projects are organized in different shapes and disturbances in the information flow in these processes can lead to problems, such as delays and/or a lower quality. Therefore, a well-functioning interaction between actors and a well thought out-communication at an early stage is of crucial importance. The main question is "How does the communication of decision and information flow in the building process and what barriers and opportunities can be observed?". This diploma work has been written with guidance from Bjerking AB and to answer this question, a collection of empirical data conducted via semi-structured interviews. Respondents with different roles in the construction processes are from the construction companies Bjerking and Ramböll.   Construction projects are interactions between actors and to fulfill that the customer get the product as described, a well thought out communication in a timely manner is important. From an economic perspective and from a quality and time perspective it is of value to investigate communication and information process and what can be perceived as positive or negative.   It is often about spread information and to make it reach the concerned, but it is also important with a limitation of the information. It is good to check that the information has arrived, but it is also important to have confidence in the project participants. Positive factors for strengthening communication may be to ensure that each actor has a common objective, a holistic interpretation in the project. One barrier might be time optimism when important information and essential decisions are delayed. Feedback, positive and negative, is good for the development of projects.