Introduction: A trend for organisations to change from single to multiple project management has been observed over the last couple of decades. Organizations shifted their focus from single project management towards the simultaneous management of the whole set of projects as one entity – project portfolio. New multi-project settings require a new management approach and practices to successfully manage a portfolio. A common practice in organizations is to evaluate projects after they had been carried out. At that point not much can be done and it is impossible to improve performance and prevent failure. Hence, problems that occur in projects’ implementation phase remain unsolved and even unidentified. Constant control, review and monitoring of projects’ performance in the implementation phase could lead to the problematic portfolio areas being spotted and timely management decisions being made in order to improve the overall portfolio performance.

Problem: How do organisations manage projects within a portfolio that perform poorly in the implementation phase?

Purpose: The purpose of this thesis is: to describe to what extent and in what ways organizations control, review and monitor project performances in the implementation phase; to identify if organisations use any methods, tools or techniques in order to spot projects that perform poorly according to their expectations; and to discover what happens to the poorly performing projects in the implementation phase after they were identified.

Method: An electronic qualitative questionnaire had been constructed and sent out to the 46 sampled Swedish companies currently running project portfolios. 115 most suitable respondents had been chosen to answer the survey.

Frame of Reference: Theoretical framework is built on the literature within project portfolio management field, mostly concerning control, review and monitoring of projects of projects’ performance within their implementation phase; practices used to manage poorly performing projects as well as the value of organizational learning.

Conclusion: The research results show that even though majority of the studied organizations are aware and striving towards efficient project portfolio control, review and monitoring, a lot of space for improvement still remains. Results reveal that organizations are trying to keep track of projects’ performance within a portfolio, however, very few poorly performing are identified. Moreover, the management practices for underperforming projects are still very limited if not non-existent.