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References to work completed : Riga city enterprises ; Riga city landfill ; Riga city commercial institutions ; collection and recycling of utilized plastic packaging from oil production in Riga city ; collection and recycling of single use dishes and accessories ; collection and recycling of used plastic packaging ( polyethenes ) . However , in the most recent round of reports , the reviewers found clear evidence of considerable use made of CAL , either in the provision of tailored software packages , or in the use of the internet , where internet-based virtual-learning environments were making effective contributions to the learning process . These take the form of focused information packages and information management solutions using our wealth of experience in such matters .