# Evaluation Methodology for Circular and Resilient Information Systems
## 3 Results
### [PERSON] Evaluation Approach
#### 3.1.1 Pilot 1--CFRP Waste for Drones  
Carbon Fibre-Reinforced Polymer (CFRP) composites have rapidly increased their use in modern products and have become strategic materials for the European industry, with the global demand expected to reach 285 kt in 2025 [41]. Prepregs (fabric pre-impregnated with a resin system) are a type of CFRP that is commonly used and uncured prepregs (entire rolls of material that have reached the expiration date or scraps coming from the cutting operations) constitute the largest part of CFRP waste. The CRIS aims to showcase the value brought forth by utilising a system to enable the (re-)use of this Secondary Raw Material in value chains. The overall goal of this pilot with the CRIS utilisation is to design a process of reusing the carbon fibre waste generated during daily operations. On that account, the requalification for expired prepreg rolls and uncured scraps must occur to ensure efficient material processing. The main problem that arises is that this material and waste have high variability in their properties, which eventually may lead to sub-optimal processing. As such, the identified KPIs for the evaluation of the CRIS that reflect the success of this processing include prepreg shelf life, prepreg disposal, value of uncured prepreg scraps, and unused CFRP waste in the production of composite materials. Figure 1: CRIS evaluation methodology timeline (from the Plooto project). KPI1.1: Prepreg Shelf Life  
This evaluation KPI relates to the shelf life of prepregs and reflects the maximum time that prepregs can be stored under specific conditions and continue to remain usable for their intended function. To support the creation of the KPI, the CRIS should monitor the same material code (in terms of lot number) used by the factory, while simultaneously tagging the material with the creation date. In this way, the CRIS can track when the factory will use the material and acquire the new expiration date in order to calculate it. The formula to calculate the KPI is as follows:  
\[KPI1.1=\frac{(N_{c}-n)}{n}*100 \tag{1}\]  
where \(N_{c}\) is the number of days passed from the prepreg production day to the new expiration day (defined through the requalification procedure conducted in another factory of the value chain) and \(n\) is the number of days passed from prepreg production to the expiration day defined by the prepreg manufacturer and indicated in the technical data sheet (baseline shelf life is equal to 365 days for base materials, where dynamic numbers should be considered for different material(s)). KPI1.2: Prepreg Disposal  
This evaluation KPI relates to the amount of prepregs that are disposed of in landfills because they become unusable. Through the CRIS, the tracked and monitored prepregs will enable the value chain's participating factories to monitor the overall quantity of prepregs that is disposed of in a landfill for a specific time period (e.g., monthly). Following that, and relative to the amount of time the pilot is operational in the different rounds, an extrapolation of the results can reflect the potential of the CRIS to reduce the prepreg disposal rates. The formula to calculate the KPI is as follows:  
\[KPI1.2=\frac{N}{month} \tag{2}\]  
where \(N\) is the quantity of prepreg in Kg that ends up in landfills. KPI1.3: Value of Uncured Prepreg Scraps  
This evaluation KPI relates to the identified economic benefits derived from the CRIS's application on the material constituting the focal point (prepreg) of the project. It is reflected by the value of uncured prepreg scraps that the system can calculate through tracking the respective material and transforming it into its monetary equivalent for the given time period. The formula to calculate the KPI is as follows:  
\[KPI1.3=\frac{N}{monthly} \tag{3}\]  
where \(N\) is the cost of prepreg in EUR that ends up in landfills and \(t\) is the selected time unit (e.g., monthly, custom).