| CAL | Past | SPACAL |
|---|---|---|
| Present | Tile/Fiber (RectTile) | |
| Future | RectTile or Strip Array ? Heavily depends on photon-detector R&D and on Full-Simulation results | |
| SHmax | Past | Si-pad (1cm sq.) |
| Present | Scintillator Strip with WLSF-readout | |
| Future | Scintillator Strip with direct-APD readout ? Revival of Si-pad ? ( keep watching LCcal ) | |
| PhotoDetector | Past | multi-channel HPD, HAPD |
| Present | multi-channel HPD, EBCCD | |
| Future | super-multi-channel HPD, multi-channel HAPD, EBCCD (or SiPM?) | |
| Organizaton | Past | Domestic activity with single design |
| Present | Almost domestic activity with a baseline and an option | |
| Future | Region-Based ⇒ Technology-Based ? |
