Whilst portfolios may encourage students to reflect, the quality of those reflections cannot be assumed. The substantial time commitment required for completion of a portfolio may detract from other important aspects of learning. It is vital to ensure that portfolios can be completed as easily and efficiently as possible, perhaps through encouraging students to include fewer pieces of evidence.

Select sentences from Buckley et al, 2009, Medical Teacher 31: 282-298. Just thought this might brighten up the day of some of my medical colleagues.