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The purpose of this paper is to investigate the multi-period, multi-attribute decision-making problems that arise when the information required to make decisions is provided at different periods.

For the multi-period grey relational analysis (MP-GRA) procedure, the time dimension is added to the grey relational analysis algorithm, which is a multi-attribute decision analysis that has been developed. As a case study to test the functionality and applicability of the model, 28 European Union member states were ranked by the MP-GRA method developed according to their human development and global competitiveness variables for the years 2006-2015.

The general ranking of EU member states has been provided in intervals of certain time periods called decision units.

Another dimension based on time periods has been added to a ranking technique. This case also shows that the opinions of decision-makers may be added separately to enhance evaluations.

How do heretical social movements build and negotiate their collective identities? This chapter tackles this question by examining the case of an emerging social movement, the left-wing Islamists in contemporary Turkey, that cuts across the durable divide between Turkey’s left and Islam. Drawing on four months of fieldwork in Turkey, I argue that, in addition to activating the typical “us versus them” dynamic of contentious politics, the left-wing Islamists also rely on blurring the social and symbolic boundaries that govern political divides in the course of building their collective identities. Their social boundary blurring includes facilitating otherwise unlikely face-to-face conversations and mutual ties between leftists and Islamists and spearheading alliances on common grounds including anti-imperialism and labor. Their symbolic boundary blurring includes performing a synthesis of Islamist and leftist repertoires of contention and reframing Islamic discourse with a strong emphasis on social justice and oppositional fervor. The case of Turkey’s left-wing Islamists illuminates the process of boundary blurring as a key dimension of collective identity and alliance formation across divides.