# Industry 4.0 Roadmap: Implementation for Small and Medium-sized Enterprises
## 3 Results
### Pick-to-Light--Boosting Productivity in the Picking and Kitting Processes  
Manual picking processes that are not properly carried out can lead to significant monetary losses. Operators need experience to know the exact location of the bins or storage racks for the different work orders in the production line.  
The pick-to-light (PTL) system provides an extraordinary solution: the front of each bin or storage rack is equipped with a numerical display with buttons. These devices or nodes are controlled by software. This software lights up the display, prompting the operator to remove goods from the bin or storage rack, and indicates how many units of the article in question should be taken on the screen.  
Once the operator has finished extracting the corresponding units, they press a key to confirm that the operation has been carried out. This informs the software, and the light is turned off.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Step Number** & **Step Description** & **Application for This Solution** \\ \hline
0 & Identify bottlenecks & Work orders for shipping are often picked incorrectly; paper-based pick lists are lost or are not properly reported to the database. \\ \hline
1 & Develop a strategy & Two shipping orders per day, consisting of 10/20 items, need to be prepared and commissioned. One pair of mixed reality glasses that can be shared between the operators is needed. Additionally, the pick lists must be digitized. \\ \hline
2 & Ideas and Prototypes & Standard shipping is used for the prototype, which consists of 15 items (10 crates and 5 boxes). The pick list needs to include customer information, the date and time of the order, the order number, the product location in the warehouse, a product locator and a photograph of the product. \\ \hline
3 & Connect/plug-in your devices & One HoloLens is ready to be used and the digital pick list is accessible. One operator is trained on the usage of the mixed reality glasses, and they will perform a couple of dry runs. \\ \hline
4 & Analyze & Control the picking time: it must be shorter. Correct possible mistakes: missing items in the picking list, ergonomics not properly controlled, etc. \\ \hline
5 & Go Live & Once the final quantitative results are available, the tool is ready to go live and to be extended to all shipping orders. \\ \hline \hline \end{tabular}
\end{table}
Table 5: Virtual reality—roadmap application.  
PTL Solution Kits consist of several PTL devices connected to a DXM700 Controller, which is configured via a touch screen.  
The PTL uses two of the technologies selected in Section 2.1.2: the IoT and Cloud Computing. The implementation following the roadmap is described in Table 6.  
The total investment for the PTL system is $2648 (for one PTL), and it is easily extendable by purchasing additional PTL devices [51]:  
* PTL110S-TD3-QP150 ($149);
* SOLUTIONSKIT-PTL ($2499).  
Quantitative Results  
PTL results are not available at this point in the research. The initial qualitative results gained from the operators in the Munich manufacturing plant are presented in Section 4.