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The low dust temperatures (<14 K) of Planck Galactic Cold Clumps (PGCCs) makethem ideal targets to probe the initial conditions and very early phase of starformation. TOP-SCOPE is a joint survey program targeting ~2000 PGCCs in J=1-0transitions of CO isotopologues and ~1000 PGCCs in 850 micron continuumemisison. The objective of the TOP-SCOPE survey and the joint surveys (SMT10-m, KVN 21-m and NRO 45-m) is to statistically study the initial conditionsoccurring during star formation and the evolution of molecular clouds, across awide range of environments. The observations, data analysis and example sciencecases for these surveys are introduced with an exemplar source, PGCCG26.53+0.17 (G26), which is a filamentary infrared dark cloud (IRDC). The totalmass, the length and the mean line-mass (M/L) of the G26 filament are ~6200Msun, ~12 pc and ~500 Msun/pc, respectively. Ten massive clumps including eightstarless ones are found along the filament. The most massive Clump as a wholemay be still in global collapse while its denser part seems to be undergoingexpansion due to outflow feedback. The fragmentation in G26 filament from cloudscale to clump scale is in agreement with gravitational fragmentation of anisothermal, non-magnetized, and turbulent supported cylinder. A bimodalbehavior in dust emissivity spectral index ($\beta$) distribution is found inG26, suggesting grain growth along the filament. The G26 filament may be formeddue to large-scale compression flows evidenced by the temperature and velocitygradients across its natal cloud.

The TOP-SCOPE survey of Planck Galactic Cold Clumps: Survey overview and results of an exemplar source, PGCC G26.53+0.17